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Pull RCU updates from Ingo Molnar:
- add RCU torture scripts/tooling
- static analysis improvements
- update RCU documentation
- miscellaneous fixes
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits)
rcu: Remove "extern" from function declarations in kernel/rcu/rcu.h
rcu: Remove "extern" from function declarations in include/linux/*rcu*.h
rcu/torture: Dynamically allocate SRCU output buffer to avoid overflow
rcu: Don't activate RCU core on NO_HZ_FULL CPUs
rcu: Warn on allegedly impossible rcu_read_unlock_special() from irq
rcu: Add an RCU_INITIALIZER for global RCU-protected pointers
rcu: Make rcu_assign_pointer's assignment volatile and type-safe
bonding: Use RCU_INIT_POINTER() for better overhead and for sparse
rcu: Add comment on evaluate-once properties of rcu_assign_pointer().
rcu: Provide better diagnostics for blocking in RCU callback functions
rcu: Improve SRCU's grace-period comments
rcu: Fix CONFIG_RCU_FANOUT_EXACT for odd fanout/leaf values
rcu: Fix coccinelle warnings
rcutorture: Stop tracking FSF's postal address
rcutorture: Move checkarg to functions.sh
rcutorture: Flag errors and warnings with color coding
rcutorture: Record results from repeated runs of the same test scenario
rcutorture: Test summary at end of run with less chattiness
rcutorture: Update comment in kvm.sh listing typical RCU trace events
rcutorture: Add tracing-enabled version of TREE08
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Pull core locking changes from Ingo Molnar:
- futex performance increases: larger hashes, smarter wakeups
- mutex debugging improvements
- lots of SMP ordering documentation updates
- introduce the smp_load_acquire(), smp_store_release() primitives.
(There are WIP patches that make use of them - not yet merged)
- lockdep micro-optimizations
- lockdep improvement: better cover IRQ contexts
- liblockdep at last. We'll continue to monitor how useful this is
* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (34 commits)
futexes: Fix futex_hashsize initialization
arch: Re-sort some Kbuild files to hopefully help avoid some conflicts
futexes: Avoid taking the hb->lock if there's nothing to wake up
futexes: Document multiprocessor ordering guarantees
futexes: Increase hash table size for better performance
futexes: Clean up various details
arch: Introduce smp_load_acquire(), smp_store_release()
arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h
arch: Move smp_mb__{before,after}_atomic_{inc,dec}.h into asm/atomic.h
locking/doc: Rename LOCK/UNLOCK to ACQUIRE/RELEASE
mutexes: Give more informative mutex warning in the !lock->owner case
powerpc: Full barrier for smp_mb__after_unlock_lock()
rcu: Apply smp_mb__after_unlock_lock() to preserve grace periods
Documentation/memory-barriers.txt: Downgrade UNLOCK+BLOCK
locking: Add an smp_mb__after_unlock_lock() for UNLOCK+BLOCK barrier
Documentation/memory-barriers.txt: Document ACCESS_ONCE()
Documentation/memory-barriers.txt: Prohibit speculative writes
Documentation/memory-barriers.txt: Add long atomic examples to memory-barriers.txt
Documentation/memory-barriers.txt: Add needed ACCESS_ONCE() calls to memory-barriers.txt
Revert "smp/cpumask: Make CONFIG_CPUMASK_OFFSTACK=y usable without debug dependency"
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Pull m68k updates from Geert Uytterhoeven:
- Zorro bus cleanups and UAPI revival
- Bootinfo cleanups and UAPI revival
- Kexec support
- Memory size reductions and bug fixes for multi-platform kernels
- Polled interrupt support for Atari EtherNAT, EtherNEC and NetUSBee
- Machine-specific random_get_entropy()
- Defconfig updates and cleanups
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k: (46 commits)
m68k/mac: Make SCC reset work more reliably
m68k/irq - Use polled IRQ flag for MFP timer cascaded interrupts
m68k: Update defconfigs for v3.13-rc1
m68k/defconfig: Enable EARLY_PRINTK
m68k/mm: kmap spelling/grammar fixes
m68k: Convert arch/m68k/kernel/traps.c to pr_*()
m68k: Convert arch/m68k/mm/fault.c to pr_*()
m68k/mm: Check for mm != NULL in do_page_fault() debug code
m68k/defconfig: Disable /sbin/hotplug fork-bomb by default
m68k/atari: Hide RTC_PORT() macro from rtc-cmos
m68k/amiga,atari: Fix specifying multiple debug= parameters
m68k/defconfig: Use ext4 for ext2/ext3 file systems
m68k: Add support to export bootinfo in procfs
m68k: Add kexec support
m68k/mac: Mark Mac IIsi ADB driver BROKEN
m68k/amiga: Provide mach_random_get_entropy()
m68k: Add infrastructure for machine-specific random_get_entropy()
m68k/atari: Call paging_init() before nf_init()
m68k: Remove superfluous inclusions of <asm/bootinfo.h>
m68k/UAPI: Use proper types (endianness/size) in <asm/bootinfo*.h>
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Pull s390 updates from Martin Schwidefsky:
"The bulk of the s390 updates for v3.14.
New features are the perf support for the CPU-Measurement Sample
Facility and the EP11 support for the crypto cards. And the normal
cleanups and bug-fixes"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (44 commits)
s390/cpum_sf: fix printk format warnings
s390: Fix misspellings using 'codespell' tool
s390/qdio: bridgeport support - CHSC part
s390: delete new instances of __cpuinit usage
s390/compat: fix PSW32_USER_BITS definition
s390/zcrypt: add support for EP11 coprocessor cards
s390/mm: optimize randomize_et_dyn for !PF_RANDOMIZE
s390: use IS_ENABLED to check if a CONFIG is set to y or m
s390/cio: use device_lock to synchronize calls to the ccwgroup driver
s390/cio: use device_lock to synchronize calls to the ccw driver
s390/cio: fix unlocked access of online member
s390/cpum_sf: Add flag to process full SDBs only
s390/cpum_sf: Add raw data sampling to support the diagnostic-sampling function
s390/cpum_sf: Filter perf events based event->attr.exclude_* settings
s390/cpum_sf: Detect KVM guest samples
s390/cpum_sf: Add helper to read TOD from trailer entries
s390/cpum_sf: Atomically reset trailer entry fields of sample-data-blocks
s390/cpum_sf: Dynamically extend the sampling buffer if overflows occur
s390/pci: reenable per default
s390/pci/dma: fix accounting of allocated_pages
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Refresh the tree with the latest fixes, before applying new changes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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The LOCK and UNLOCK barriers as described in our barrier document are
generally known as ACQUIRE and RELEASE barriers in other literature.
Since we plan to introduce the acquire and release nomenclature in
generic kernel primitives we should amend the document to avoid
confusion as to what an acquire/release means.
Reviewed-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Victor Kaplansky <VICTORK@il.ibm.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/20131217092435.GC21999@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Samsung Clock fixes for 3.13-rc7
* Several patches fixing up incorrectly defined register addresses and
bitfield offsets that could lead to undefined operation when accessing
respective registers or bitfields.
1) clk: exynos5250: fix sysmmu_mfc{l,r} gate clocks
2a) clk: samsung: exynos5250: Fix ACP gate register offset
2b) clk: samsung: exynos5250: Add MDMA0 clocks
2c) ARM: dts: exynos5250: Fix MDMA0 clock number
3) clk: samsung: exynos4: Correct SRC_MFC register
All three issues have been present since Exynos5250 and Exynos4 clock
drivers were added by commits 6e3ad26816b72 ("clk: exynos5250:
register clocks using common clock framework") and e062b571777f5
("clk: exynos4: register clocks using common clock framework")
respectively.
* Patch to fix automatic disabling of Exynos5250 sysreg clock that could
cause undefined operation of several peripherals, such as USB, I2C,
MIPI or display block.
4) clk: samsung: exynos5250: Add CLK_IGNORE_UNUSED flag for the sysreg
clock
Present since Exynos5250 clock drivers was added by commits
6e3ad26816b72 ("clk: exynos5250: register clocks using common clock
framework").
* Patch fixing compilation warning in clk-exynos-audss driver when
CONFIG_PM_SLEEP is disabled.
5) clk: exynos: File scope reg_save array should depend on PM_SLEEP
Present since the driver was added by commit 1241ef94ccc3 ("clk:
samsung: register audio subsystem clocks using common clock
framework").
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Adds gate clock for MDMA0 on Exynos5250 SoC. This is needed to ensure
that the clock is enabled when MDMA0 is used on systems on which
firmware gates the clockby default.
Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
[t.figa: Updated patch description.]
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
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Pull block fixes from Jens Axboe:
- fix for a memory leak on certain unplug events
- a collection of bcache fixes from Kent and Nicolas
- a few null_blk fixes and updates form Matias
- a marking of static of functions in the stec pci-e driver
* 'for-linus' of git://git.kernel.dk/linux-block:
null_blk: support submit_queues on use_per_node_hctx
null_blk: set use_per_node_hctx param to false
null_blk: corrections to documentation
null_blk: warning on ignored submit_queues param
null_blk: refactor init and init errors code paths
null_blk: documentation
null_blk: mem garbage on NUMA systems during init
drivers: block: Mark the functions as static in skd_main.c
bcache: New writeback PD controller
bcache: bugfix for race between moving_gc and bucket_invalidate
bcache: fix for gc and writeback race
bcache: bugfix - moving_gc now moves only correct buckets
bcache: fix for gc crashing when no sectors are used
bcache: Fix heap_peek() macro
bcache: Fix for can_attach_cache()
bcache: Fix dirty_data accounting
bcache: Use uninterruptible sleep in writeback
bcache: kthread don't set writeback task to INTERUPTIBLE
block: fix memory leaks on unplugging block device
bcache: fix sparse non static symbol warning
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Pull libata fixes from Tejun Heo:
"There's one interseting commit - "libata, freezer: avoid block device
removal while system is frozen". It's an ugly hack working around a
deadlock condition between driver core resume and block layer device
removal paths through freezer which was made more reproducible by
writeback being converted to workqueue some releases ago. The bug has
nothing to do with libata but it's just an workaround which is easy to
backport. After discussion, Rafael and I seem to agree that we don't
really need kernel freezables - both kthread and workqueue. There are
few specific workqueues which constitute PM operations and require
freezing, which will be converted to use workqueue_set_max_active()
instead. All other kernel freezer uses are planned to be removed,
followed by the removal of kthread and workqueue freezer support,
hopefully.
Others are device-specific fixes. The most notable is the addition of
NO_NCQ_TRIM which is used to disable queued TRIM commands to Micro
M500 SSDs which otherwise suffers data corruption"
* 'for-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
libata, freezer: avoid block device removal while system is frozen
libata: implement ATA_HORKAGE_NO_NCQ_TRIM and apply it to Micro M500 SSDs
libata: disable a disk via libata.force params
ahci: bail out on ICH6 before using AHCI BAR
ahci: imx: Explicitly clear IMX6Q_GPR13_SATA_MPLL_CLK_EN
libata: add ATA_HORKAGE_BROKEN_FPDMA_AA quirk for Seagate Momentus SpinPoint M8
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The defaults for the module is to instantiate itself with blk-mq and a
submit queue for each CPU node in the system.
To save resources, initialize instead with a single submit queue.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Randy Dunlap reported a couple of grammar errors and unfortunate usages of
socket/node/core.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Add description of module and its parameters.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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Pull crypto key patches from David Howells:
"There are four items:
- A patch to fix X.509 certificate gathering. The problem was that I
was coming up with a different path for signing_key.x509 in the
build directory if it didn't exist to if it did exist. This meant
that the X.509 cert container object file would be rebuilt on the
second rebuild in a build directory and the kernel would get
relinked.
- Unconditionally remove files generated by SYSTEM_TRUSTED_KEYRING=y
when doing make mrproper.
- Actually initialise the persistent-keyring semaphore for
init_user_ns. I have no idea why this works at all for users in
the base user namespace unless it's something to do with systemd
containerising the system.
- Documentation for module signing"
* 'keys-devel' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
Add Documentation/module-signing.txt file
KEYS: fix uninitialized persistent_keyring_register_sem
KEYS: Remove files generated when SYSTEM_TRUSTED_KEYRING=y
X.509: Fix certificate gathering
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This feature extends the generic cryptographic device driver (zcrypt)
with a new capability to service EP11 requests for the Crypto Express4S
card in EP11 (Enterprise PKCS#11 mode) coprocessor mode.
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Merge Linux 3.13-rc4, to refresh this rather old tree with the latest fixes.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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A user on StackExchange had a failing SSD that's soldered directly
onto the motherboard of his system. The BIOS does not give any option
to disable it at all, so he can't just hide it from the OS via the
BIOS.
The old IDE layer had hdX=noprobe override for situations like this,
but that was never ported to the libata layer.
This patch implements a disable flag for libata.force.
Example use:
libata.force=2.0:disable
[v2 of the patch, removed the nodisable flag per Tejun Heo]
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Link: http://unix.stackexchange.com/questions/102648/how-to-tell-linux-kernel-3-0-to-completely-ignore-a-failing-disk
Link: http://askubuntu.com/questions/352836/how-can-i-tell-linux-kernel-to-completely-ignore-a-disk-as-if-it-was-not-even-co
Link: http://superuser.com/questions/599333/how-to-disable-kernel-probing-for-drive
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Pull v3.14 RCU updates from Paul E. McKenney.
The main changes:
* Update RCU documentation.
* Miscellaneous fixes.
* Add RCU torture scripts.
* Static-analysis improvements.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Historically, an UNLOCK+LOCK pair executed by one CPU, by one
task, or on a given lock variable has implied a full memory
barrier. In a recent LKML thread, the wisdom of this historical
approach was called into question:
http://www.spinics.net/lists/linux-mm/msg65653.html, in part due
to the memory-order complexities of low-handoff-overhead queued
locks on x86 systems.
This patch therefore removes this guarantee from the
documentation, and further documents how to restore it via a new
smp_mb__after_unlock_lock() primitive.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-6-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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The situations in which ACCESS_ONCE() is required are not well
documented, so this commit adds some verbiage to
memory-barriers.txt.
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-4-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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No SMP architecture currently supporting Linux allows
speculative writes, so this commit updates
Documentation/memory-barriers.txt to prohibit them in Linux core
code. It also records restrictions on their use.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-3-git-send-email-paulmck@linux.vnet.ibm.com
[ Paul modified the original patch from Peter. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Although the atomic_long_t functions are quite useful, they are
a bit obscure. This commit therefore adds the common ones
alongside their atomic_t counterparts in
Documentation/memory-barriers.txt.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-2-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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The Documentation/memory-barriers.txt file was written before
the need for ACCESS_ONCE() was fully appreciated. It therefore
contains no ACCESS_ONCE() calls, which can be a problem when
people lift examples from it. This commit therefore adds
ACCESS_ONCE() calls.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <linux-arch@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1386799151-2219-1-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Pull networking fixes from David Miller:
1) Revert CHECKSUM_COMPLETE optimization in pskb_trim_rcsum(), I can't
figure out why it breaks things.
2) Fix comparison in netfilter ipset's hash_netnet4_data_equal(), it
was basically doing "x == x", from Dave Jones.
3) Freescale FEC driver was DMA mapping the wrong number of bytes, from
Sebastian Siewior.
4) Blackhole and prohibit routes in ipv6 were not doing the right thing
because their ->input and ->output methods were not being assigned
correctly. Now they behave properly like their ipv4 counterparts.
From Kamala R.
5) Several drivers advertise the NETIF_F_FRAGLIST capability, but
really do not support this feature and will send garbage packets if
fed fraglist SKBs. From Eric Dumazet.
6) Fix long standing user triggerable BUG_ON over loopback in RDS
protocol stack, from Venkat Venkatsubra.
7) Several not so common code paths can potentially try to invoke
packet scheduler actions that might be NULL without checking. Shore
things up by either 1) defining a method as mandatory and erroring
on registration if that method is NULL 2) defininig a method as
optional and the registration function hooks up a default
implementation when NULL is seen. From Jamal Hadi Salim.
8) Fix fragment detection in xen-natback driver, from Paul Durrant.
9) Kill dangling enter_memory_pressure method in cg_proto ops, from
Eric W Biederman.
10) SKBs that traverse namespaces should have their local_df cleared,
from Hannes Frederic Sowa.
11) IOCB file position is not being updated by macvtap_aio_read() and
tun_chr_aio_read(). From Zhi Yong Wu.
12) Don't free virtio_net netdev before releasing all of the NAPI
instances. From Andrey Vagin.
13) Procfs entry leak in xt_hashlimit, from Sergey Popovich.
14) IPv6 routes that are no cached routes should not count against the
garbage collection limits. We had this almost right, but were
missing handling addrconf generated routes properly. From Hannes
Frederic Sowa.
15) fib{4,6}_rule_suppress() have to consider potentially seeing NULL
route info when they are called, from Stefan Tomanek.
16) TUN and MACVTAP have had truncated packet signalling for some time,
fix from Jason Wang.
17) Fix use after frrr in __udp4_lib_rcv(), from Eric Dumazet.
18) xen-netback does not interpret the NAPI budget properly for TX work,
fix from Paul Durrant.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (132 commits)
igb: Fix for issue where values could be too high for udelay function.
i40e: fix null dereference
xen-netback: fix gso_prefix check
net: make neigh_priv_len in struct net_device 16bit instead of 8bit
drivers: net: cpsw: fix for cpsw crash when build as modules
xen-netback: napi: don't prematurely request a tx event
xen-netback: napi: fix abuse of budget
sch_tbf: use do_div() for 64-bit divide
udp: ipv4: must add synchronization in udp_sk_rx_dst_set()
net:fec: remove duplicate lines in comment about errata ERR006358
Revert "8390 : Replace ei_debug with msg_enable/NETIF_MSG_* feature"
8390 : Replace ei_debug with msg_enable/NETIF_MSG_* feature
xen-netback: make sure skb linear area covers checksum field
net: smc91x: Fix device tree based configuration so it's usable
udp: ipv4: fix potential use after free in udp_v4_early_demux()
macvtap: signal truncated packets
tun: unbreak truncated packet signalling
net: sched: htb: fix the calculation of quantum
net: sched: tbf: fix the calculation of max_size
micrel: add support for KSZ8041RNLI
...
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Pull device mapper fixes from Mike Snitzer:
"A set of device-mapper fixes for 3.13.
A fix for possible memory corruption during DM table load, fix a
possible leak of snapshot space in case of a crash, fix a possible
deadlock due to a shared workqueue in the delay target, fix to
initialize read-only module parameters that are used to export metrics
for dm stats and dm bufio.
Quite a few stable fixes were identified for both the thin-
provisioning and caching targets as a result of increased regression
testing using the device-mapper-test-suite (dmts). The most notable
of these are the reference counting fixes for the space map btree that
is used by the dm-array interface -- without these the dm-cache
metadata will leak, resulting in dm-cache devices running out of
metadata blocks. Also, some important fixes related to the
thin-provisioning target's transition to read-only mode on error"
* tag 'dm-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm array: fix a reference counting bug in shadow_ablock
dm space map: disallow decrementing a reference count below zero
dm stats: initialize read-only module parameter
dm bufio: initialize read-only module parameters
dm cache: actually resize cache
dm cache: update Documentation for invalidate_cblocks's range syntax
dm cache policy mq: fix promotions to occur as expected
dm thin: allow pool in read-only mode to transition to read-write mode
dm thin: re-establish read-only state when switching to fail mode
dm thin: always fallback the pool mode if commit fails
dm thin: switch to read-only mode if metadata space is exhausted
dm thin: switch to read only mode if a mapping insert fails
dm space map metadata: return on failure in sm_metadata_new_block
dm table: fail dm_table_create on dm_round_up overflow
dm snapshot: avoid snapshot space leak on crash
dm delay: fix a possible deadlock due to shared workqueue
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|
This patch adds the Documentation/module-signing.txt file that is
currently missing from the Documentation directory. The init/Kconfig
file references the Documentation/module-signing.txt file to explain
how kernel module signing works. This patch supplies this documentation.
Signed-off-by: James Solner <solner@alcatel-lucent.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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|
doc.2013.12.03a: Topic branch for documentation changes.
fixes.2013.12.12a: Topic branch for miscellaneous fixes.
rcutorture.2013.12.03a: Topic branch for new rcutorture/KVM scripting.
sparse.2013.12.12a: Topic branch for sparse-RCU changes.
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Pull media fixes from Mauro Carvalho Chehab:
"A dvb core deadlock fix, a couple videobuf2 fixes an a series of media
driver fixes"
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (30 commits)
[media] videobuf2-dma-sg: fix possible memory leak
[media] vb2: regression fix: always set length field.
[media] mt9p031: Include linux/of.h header
[media] rtl2830: add parent for I2C adapter
[media] media: marvell-ccic: use devm to release clk
[media] ths7303: Declare as static a private function
[media] em28xx-video: Swap release order to avoid lock nesting
[media] usbtv: Add support for PAL video source
[media] media_tree: Fix spelling errors
[media] videobuf2: Add support for file access mode flags for DMABUF exporting
[media] radio-shark2: Mark shark_resume_leds() inline to kill compiler warning
[media] radio-shark: Mark shark_resume_leds() inline to kill compiler warning
[media] af9035: unlock on error in af9035_i2c_master_xfer()
[media] af9033: fix broken I2C
[media] v4l: omap3isp: Don't check for missing get_fmt op on remote subdev
[media] af9035: fix broken I2C and USB I/O
[media] wm8775: fix broken audio routing
[media] marvell-ccic: drop resource free in driver remove
[media] tef6862/radio-tea5764: actually assign clamp result
[media] cx231xx: use after free on error path in probe
...
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Pull misc keyrings fixes from David Howells:
"These break down into five sets:
- A patch to error handling in the big_key type for huge payloads.
If the payload is larger than the "low limit" and the backing store
allocation fails, then big_key_instantiate() doesn't clear the
payload pointers in the key, assuming them to have been previously
cleared - but only one of them is.
Unfortunately, the garbage collector still calls big_key_destroy()
when sees one of the pointers with a weird value in it (and not
NULL) which it then tries to clean up.
- Three patches to fix the keyring type:
* A patch to fix the hash function to correctly divide keyrings off
from keys in the topology of the tree inside the associative
array. This is only a problem if searching through nested
keyrings - and only if the hash function incorrectly puts the a
keyring outside of the 0 branch of the root node.
* A patch to fix keyrings' use of the associative array. The
__key_link_begin() function initially passes a NULL key pointer
to assoc_array_insert() on the basis that it's holding a place in
the tree whilst it does more allocation and stuff.
This is only a problem when a node contains 16 keys that match at
that level and we want to add an also matching 17th. This should
easily be manufactured with a keyring full of keyrings (without
chucking any other sort of key into the mix) - except for (a)
above which makes it on average adding the 65th keyring.
* A patch to fix searching down through nested keyrings, where any
keyring in the set has more than 16 keyrings and none of the
first keyrings we look through has a match (before the tree
iteration needs to step to a more distal node).
Test in keyutils test suite:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/keyutils.git/commit/?id=8b4ae963ed92523aea18dfbb8cab3f4979e13bd1
- A patch to fix the big_key type's use of a shmem file as its
backing store causing audit messages and LSM check failures. This
is done by setting S_PRIVATE on the file to avoid LSM checks on the
file (access to the shmem file goes through the keyctl() interface
and so is gated by the LSM that way).
This isn't normally a problem if a key is used by the context that
generated it - and it's currently only used by libkrb5.
Test in keyutils test suite:
http://git.kernel.org/cgit/linux/kernel/git/dhowells/keyutils.git/commit/?id=d9a53cbab42c293962f2f78f7190253fc73bd32e
- A patch to add a generated file to .gitignore.
- A patch to fix the alignment of the system certificate data such
that it it works on s390. As I understand it, on the S390 arch,
symbols must be 2-byte aligned because loading the address discards
the least-significant bit"
* tag 'keys-devel-20131210' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
KEYS: correct alignment of system_certificate_list content in assembly file
Ignore generated file kernel/x509_certificate_list
security: shmem: implement kernel private shmem inodes
KEYS: Fix searching of nested keyrings
KEYS: Fix multiple key add into associative array
KEYS: Fix the keyring hash function
KEYS: Pre-clear struct key on allocation
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Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
added minimal device tree support to smc91x, but it's not working on
many platforms because of the lack of some key configuration bits.
Fix the issue by parsing the necessary configuration like the
smc911x driver is doing. As most smc91x users seem to use 16-bit
access, let's default to that if no reg-io-width is specified.
Cc: Nicolas Pitre <nico@fluxnic.net>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: netdev@vger.kernel.org
Cc: devicetree@vger.kernel.org
Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The cache target's invalidate_cblocks message allows cache block
(cblock) ranges to be expressed with: <cblock start>-<cblock end>
The range's <cblock end> value is "one past the end", so the range
includes <cblock start> through <cblock end>-1.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
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Commit e40526cb20b5 introduced a cached dev pointer, that gets
hooked into register_prot_hook(), __unregister_prot_hook() to
update the device used for the send path.
We need to fix this up, as otherwise this will not work with
sockets created with protocol = 0, plus with sll_protocol = 0
passed via sockaddr_ll when doing the bind.
So instead, assign the pointer directly. The compiler can inline
these helper functions automagically.
While at it, also assume the cached dev fast-path as likely(),
and document this variant of socket creation as it seems it is
not widely used (seems not even the author of TX_RING was aware
of that in his reference example [1]). Tested with reproducer
from e40526cb20b5.
[1] http://wiki.ipxwarzone.com/index.php5?title=Linux_packet_mmap#Example
Fixes: e40526cb20b5 ("packet: fix use after free race in send path when dev is released")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Tested-by: Salam Noureddine <noureddine@aristanetworks.com>
Tested-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently it is not possible for userspace to map a DMABUF exported buffer
with write permissions. This patch allows to also pass O_RDONLY/O_RDWR when
exporting the buffer, so that userspace may map it with write permissions.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
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Pull char/misc driver fixes from Greg KH:
"Nothing huge, just a few small bugfixes for problems reported, and a
device id update"
* tag 'char-misc-3.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
mei: add 9 series PCH mei device ids
drivers/char/i8k.c: add Dell XPLS L421X
MAINTAINERS: add HSI subsystem
misc: mic: Suppress memory space sparse warnings
misc: mic: Fix endianness issues.
misc: mic: Fix user space namespace pollution from mic_common.h.
misc: mic: Bug fix for sysfs poll usage.
misc: mic: Minor bug fix in 'retry' loops.
misc: mic: Change mic_notify(...) to return true.
extcon: remove freed groups caused the panic or warning in unregister flow
extcon: arizona: Get pdata from arizona structure not device
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Pull devicetree fixes from Rob Herring:
- Various DT binding documentation updates
- Add Kumar Gala and remove Stephen Warren as DT binding maintainers
* tag 'dt-fixes-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
dt: binding: reword PowerPC 8xxx GPIO documentation
ARM: tegra: delete nvidia,tegra20-spi.txt binding
hwmon: ntc_thermistor: Fix typo (pullup-uV -> pullup-uv)
of: add vendor prefix for GMT
clk: exynos: Fix typos in DT bindings documentation
of: Add vendor prefix for LG Corporation
Documentation: net: fsl-fec.txt: Add phy-supply entry
ARM: dts: doc: Document missing binding for omap5-mpu
dt-bindings: add ARMv8 PMU binding
MAINTAINERS: remove swarren from DT bindings
MAINTAINERS: Add Kumar to Device Tree Binding maintainers group
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When booted with device tree, we may still have platform data passed
as auxdata. For am3517 this is needed for passing the interrupt_enable
and interrupt_disable callbacks that access the omap system control module
registers. These callback functions will eventually go away when we have
a separate system control module driver.
Some of the things that are currently passed as platform data we don't need
to set up as device tree properties as they are always the same on am3517.
So let's use a new compatible flag for those so we can get those from
the device tree match data.
Also note that we need to fix setting of phy_dev to NULL instead of an empty
string as the code later on uses that to find the first phy on the mdio bus.
This seems to have been caused by 5d69e0076a72 (net: davinci_emac: switch to
new mdio).
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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|
Pull GPIO fixes from Linus Walleij:
"Here are a few more GPIO patches, we're a bit noisy for being the GPIO
subsystem, mostly due to the new descriptor API, but all is getting
into shape.
- Fix compile warnings
- Fix overly talkative diagnostic messages from usual use cases wrt
GPIO descriptors
- Add a documentation 00-INDEX
- Use platform GPIOs as fallback when ACPI or device tree is used as
the primary means to get GPIO lines
- A bug fix for the MPC8572/MPC8536 fixing erroneous input data"
* tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
gpiolib: change a warning to debug message when failing to get gpio
powerpc/gpio: Fix the wrong GPIO input data on MPC8572/MPC8536
gpiolib: use platform GPIO mappings as fallback
Documentation: gpiolib: add 00-INDEX file
gpiolib: fix lookup of platform-mapped GPIOs
gpiolib: add missing declarations
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Pull ARM SoC fixes from Olof Johansson:
"Another batch of fixes for ARM SoCs for 3.13. The diffstat is large,
mostly because of:
- Another set of fixes to fix regressions caused by moving OMAP from
board files to DT. Tony thinks this was the last major set of
fixes, with maybe just a few small patches to follow.
- More fixes for Marvell platforms, most dealing with misdescribed
PCIe hardware, i.e. incorrect number of busses on some SoCs, etc.
The line delta adds up due to various ranges moving around when
this is fixed.
But there's also:
- Some smaller tweaks to defconfigs to make more boards bootable in
my test setup for better coverage.
- There are also a few other smaller fixes, a short series for at91,
a couple of reverts for ux500, etc"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (39 commits)
arm: dts: socfpga: Change some clocks of gate-clk type to perip-clk
arm: socfpga: Enable ARM_TWD for socfpga
ARM: multi_v7_defconfig: enable SDHCI_BCM_KONA and MMC_BLOCK_MINORS=16
ARM: sunxi_defconfig: enable NFS, TMPFS, PRINTK_TIME and nfsroot support
ARM: multi_v7_defconfig: enable network for BeagleBone Black
ARM: dts: Fix the name of supplies for smsc911x shared by OMAP
ARM: OMAP2+: Powerdomain: Fix unchecked dereference of arch_pwrdm
ARM: dts: omap3-beagle: Add omap-twl4030 audio support
ARM: dts: omap4-sdp: Fix pin muxing for wl12xx
ARM: dts: omap4-panda-common: Fix pin muxing for wl12xx
ARM: at91: fixed unresolved symbol "at91_pm_set_standby" when built without CONFIG_PM
ARM: at91: add usart3 alias to dtsi
ARM: at91: sama5d3: reduce TWI internal clock frequency
mmc: omap: Fix I2C dependency and make driver usable with device tree
mmc: omap: Fix DMA configuration to not rely on device id
ARM: dts: omap3-beagle: Fix USB host on beagle boards (for 3.13)
ARM: dts: omap3-igep0020: name twl4030 VPLL2 regulator as vdds_dsi
ARM: dts: AM33XX IGEP0033: add USB support
ARM: dts: AM33XX BASE0033: add 32KBit EEPROM support
ARM: dts: AM33XX BASE0033: add pinmux and user led support
...
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From Tony Lindgren:
Some omap related fixes that have come up with people moving to device
tree only based booting for omap2+.
The series contains a handful of fixes for the igep boards as they were
one of the first omap3 boards to jump over completely to device tree
based booting. So these can be considered regressions compared to
booting igep in legacy mode with board files in v3.12.
Also included are few other device tree vs legacy booting regressions:
- yet more missing omap3 .dtsi entries that have showed up booting
various boards with device tree only
- n900 eMMC device tree fix
- fixes for beagle USB EHCI
- two fixes to make omap2420 MMC work
As we're moving omap2+ to be device tree only for v3.14, I'd like to
have v3.13 work equally well for legacy based booting and device tree
based booting. So there will be likely few more device tree related
booting patches trickling in.
This series also includes a regression fix for the omap timer posted
mode that may wrongly stay on from the bootloader for some SoCs.
* tag 'omap-for-v3.13/fixes-against-rc1-take2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
mmc: omap: Fix I2C dependency and make driver usable with device tree
mmc: omap: Fix DMA configuration to not rely on device id
ARM: dts: omap3-beagle: Fix USB host on beagle boards (for 3.13)
ARM: dts: omap3-igep0020: name twl4030 VPLL2 regulator as vdds_dsi
ARM: dts: AM33XX IGEP0033: add USB support
ARM: dts: AM33XX BASE0033: add 32KBit EEPROM support
ARM: dts: AM33XX BASE0033: add pinmux and user led support
ARM: dts: AM33XX BASE0033: add pinmux and hdmi node to enable display
ARM: dts: omap3-igep0020: Add pinmuxing for DVI output
ARM: dts: omap3-igep0020: Add pinmux setup for i2c devices
ARM: dts: omap3-igep: Update to use the TI AM/DM37x processor
ARM: dts: omap3-igep: Add support for LBEE1USJYC WiFi connected to SDIO
ARM: dts: omap3-igep: Fix bus-width for mmc1
ARM: OMAP2+: dss-common: change IGEP's DVI DDC i2c bus
ARM: OMAP2+: Disable POSTED mode for errata i103 and i767
ARM: OMAP2+: Fix eMMC on n900 with device tree
ARM: OMAP2+: Add fixed regulator to omap2plus_defconfig
ARM: OMAP2+: Fix more missing data for omap3.dtsi file
Signed-off-by: Olof Johansson <olof@lixom.net>
|
|
Dave Jones got the following lockdep splat:
> ======================================================
> [ INFO: possible circular locking dependency detected ]
> 3.12.0-rc3+ #92 Not tainted
> -------------------------------------------------------
> trinity-child2/15191 is trying to acquire lock:
> (&rdp->nocb_wq){......}, at: [<ffffffff8108ff43>] __wake_up+0x23/0x50
>
> but task is already holding lock:
> (&ctx->lock){-.-...}, at: [<ffffffff81154c19>] perf_event_exit_task+0x109/0x230
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #3 (&ctx->lock){-.-...}:
> [<ffffffff810cc243>] lock_acquire+0x93/0x200
> [<ffffffff81733f90>] _raw_spin_lock+0x40/0x80
> [<ffffffff811500ff>] __perf_event_task_sched_out+0x2df/0x5e0
> [<ffffffff81091b83>] perf_event_task_sched_out+0x93/0xa0
> [<ffffffff81732052>] __schedule+0x1d2/0xa20
> [<ffffffff81732f30>] preempt_schedule_irq+0x50/0xb0
> [<ffffffff817352b6>] retint_kernel+0x26/0x30
> [<ffffffff813eed04>] tty_flip_buffer_push+0x34/0x50
> [<ffffffff813f0504>] pty_write+0x54/0x60
> [<ffffffff813e900d>] n_tty_write+0x32d/0x4e0
> [<ffffffff813e5838>] tty_write+0x158/0x2d0
> [<ffffffff811c4850>] vfs_write+0xc0/0x1f0
> [<ffffffff811c52cc>] SyS_write+0x4c/0xa0
> [<ffffffff8173d4e4>] tracesys+0xdd/0xe2
>
> -> #2 (&rq->lock){-.-.-.}:
> [<ffffffff810cc243>] lock_acquire+0x93/0x200
> [<ffffffff81733f90>] _raw_spin_lock+0x40/0x80
> [<ffffffff810980b2>] wake_up_new_task+0xc2/0x2e0
> [<ffffffff81054336>] do_fork+0x126/0x460
> [<ffffffff81054696>] kernel_thread+0x26/0x30
> [<ffffffff8171ff93>] rest_init+0x23/0x140
> [<ffffffff81ee1e4b>] start_kernel+0x3f6/0x403
> [<ffffffff81ee1571>] x86_64_start_reservations+0x2a/0x2c
> [<ffffffff81ee1664>] x86_64_start_kernel+0xf1/0xf4
>
> -> #1 (&p->pi_lock){-.-.-.}:
> [<ffffffff810cc243>] lock_acquire+0x93/0x200
> [<ffffffff8173419b>] _raw_spin_lock_irqsave+0x4b/0x90
> [<ffffffff810979d1>] try_to_wake_up+0x31/0x350
> [<ffffffff81097d62>] default_wake_function+0x12/0x20
> [<ffffffff81084af8>] autoremove_wake_function+0x18/0x40
> [<ffffffff8108ea38>] __wake_up_common+0x58/0x90
> [<ffffffff8108ff59>] __wake_up+0x39/0x50
> [<ffffffff8110d4f8>] __call_rcu_nocb_enqueue+0xa8/0xc0
> [<ffffffff81111450>] __call_rcu+0x140/0x820
> [<ffffffff81111b8d>] call_rcu+0x1d/0x20
> [<ffffffff81093697>] cpu_attach_domain+0x287/0x360
> [<ffffffff81099d7e>] build_sched_domains+0xe5e/0x10a0
> [<ffffffff81efa7fc>] sched_init_smp+0x3b7/0x47a
> [<ffffffff81ee1f4e>] kernel_init_freeable+0xf6/0x202
> [<ffffffff817200be>] kernel_init+0xe/0x190
> [<ffffffff8173d22c>] ret_from_fork+0x7c/0xb0
>
> -> #0 (&rdp->nocb_wq){......}:
> [<ffffffff810cb7ca>] __lock_acquire+0x191a/0x1be0
> [<ffffffff810cc243>] lock_acquire+0x93/0x200
> [<ffffffff8173419b>] _raw_spin_lock_irqsave+0x4b/0x90
> [<ffffffff8108ff43>] __wake_up+0x23/0x50
> [<ffffffff8110d4f8>] __call_rcu_nocb_enqueue+0xa8/0xc0
> [<ffffffff81111450>] __call_rcu+0x140/0x820
> [<ffffffff81111bb0>] kfree_call_rcu+0x20/0x30
> [<ffffffff81149abf>] put_ctx+0x4f/0x70
> [<ffffffff81154c3e>] perf_event_exit_task+0x12e/0x230
> [<ffffffff81056b8d>] do_exit+0x30d/0xcc0
> [<ffffffff8105893c>] do_group_exit+0x4c/0xc0
> [<ffffffff810589c4>] SyS_exit_group+0x14/0x20
> [<ffffffff8173d4e4>] tracesys+0xdd/0xe2
>
> other info that might help us debug this:
>
> Chain exists of:
> &rdp->nocb_wq --> &rq->lock --> &ctx->lock
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(&ctx->lock);
> lock(&rq->lock);
> lock(&ctx->lock);
> lock(&rdp->nocb_wq);
>
> *** DEADLOCK ***
>
> 1 lock held by trinity-child2/15191:
> #0: (&ctx->lock){-.-...}, at: [<ffffffff81154c19>] perf_event_exit_task+0x109/0x230
>
> stack backtrace:
> CPU: 2 PID: 15191 Comm: trinity-child2 Not tainted 3.12.0-rc3+ #92
> ffffffff82565b70 ffff880070c2dbf8 ffffffff8172a363 ffffffff824edf40
> ffff880070c2dc38 ffffffff81726741 ffff880070c2dc90 ffff88022383b1c0
> ffff88022383aac0 0000000000000000 ffff88022383b188 ffff88022383b1c0
> Call Trace:
> [<ffffffff8172a363>] dump_stack+0x4e/0x82
> [<ffffffff81726741>] print_circular_bug+0x200/0x20f
> [<ffffffff810cb7ca>] __lock_acquire+0x191a/0x1be0
> [<ffffffff810c6439>] ? get_lock_stats+0x19/0x60
> [<ffffffff8100b2f4>] ? native_sched_clock+0x24/0x80
> [<ffffffff810cc243>] lock_acquire+0x93/0x200
> [<ffffffff8108ff43>] ? __wake_up+0x23/0x50
> [<ffffffff8173419b>] _raw_spin_lock_irqsave+0x4b/0x90
> [<ffffffff8108ff43>] ? __wake_up+0x23/0x50
> [<ffffffff8108ff43>] __wake_up+0x23/0x50
> [<ffffffff8110d4f8>] __call_rcu_nocb_enqueue+0xa8/0xc0
> [<ffffffff81111450>] __call_rcu+0x140/0x820
> [<ffffffff8109bc8f>] ? local_clock+0x3f/0x50
> [<ffffffff81111bb0>] kfree_call_rcu+0x20/0x30
> [<ffffffff81149abf>] put_ctx+0x4f/0x70
> [<ffffffff81154c3e>] perf_event_exit_task+0x12e/0x230
> [<ffffffff81056b8d>] do_exit+0x30d/0xcc0
> [<ffffffff810c9af5>] ? trace_hardirqs_on_caller+0x115/0x1e0
> [<ffffffff810c9bcd>] ? trace_hardirqs_on+0xd/0x10
> [<ffffffff8105893c>] do_group_exit+0x4c/0xc0
> [<ffffffff810589c4>] SyS_exit_group+0x14/0x20
> [<ffffffff8173d4e4>] tracesys+0xdd/0xe2
The underlying problem is that perf is invoking call_rcu() with the
scheduler locks held, but in NOCB mode, call_rcu() will with high
probability invoke the scheduler -- which just might want to use its
locks. The reason that call_rcu() needs to invoke the scheduler is
to wake up the corresponding rcuo callback-offload kthread, which
does the job of starting up a grace period and invoking the callbacks
afterwards.
One solution (championed on a related problem by Lai Jiangshan) is to
simply defer the wakeup to some point where scheduler locks are no longer
held. Since we don't want to unnecessarily incur the cost of such
deferral, the task before us is threefold:
1. Determine when it is likely that a relevant scheduler lock is held.
2. Defer the wakeup in such cases.
3. Ensure that all deferred wakeups eventually happen, preferably
sooner rather than later.
We use irqs_disabled_flags() as a proxy for relevant scheduler locks
being held. This works because the relevant locks are always acquired
with interrupts disabled. We may defer more often than needed, but that
is at least safe.
The wakeup deferral is tracked via a new field in the per-CPU and
per-RCU-flavor rcu_data structure, namely ->nocb_defer_wakeup.
This flag is checked by the RCU core processing. The __rcu_pending()
function now checks this flag, which causes rcu_check_callbacks()
to initiate RCU core processing at each scheduling-clock interrupt
where this flag is set. Of course this is not sufficient because
scheduling-clock interrupts are often turned off (the things we used to
be able to count on!). So the flags are also checked on entry to any
state that RCU considers to be idle, which includes both NO_HZ_IDLE idle
state and NO_HZ_FULL user-mode-execution state.
This approach should allow call_rcu() to be invoked regardless of what
locks you might be holding, the key word being "should".
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
|
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This commit replaces full barriers by targeted use of load-acquire and
store-release.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Restore comments as suggested by David Howells. ]
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The code sample in Documentation/circular-buffers.txt appears to have a
few ordering bugs. This patch therefore applies the needed fixes.
Reported-by: Lech Fomicki <lfomicki@poczta.fm>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Give a short overview of the various GPIO documentation files.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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re-format and re-word the device tree binding documentation for MPC8xxx
and compatibles, reference the common document for interrupt controllers
and remove outdated duplicate SoC specific information
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Pawel Moll <Pawel.Moll@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: <devicetree@vger.kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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This binding shouldn't exist; Tegra20 has two forms of SPI controller
that are documented separately in nvidia,tegra20-sflash.txt and
nvidia,tegra20-slink.txt.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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This patch fix typo of property name from 'pullup-uV' to 'pullup-uv'.
The ntc_thermistor.c use 'pullup-uv' when parsing dt data.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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Adding Global Mixed-mode Technology Inc. to the list
of devicetree vendor prefixes.
Signed-off-by: Wei Ni <wni@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
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Linus Torvalds
Ingo Molnar
Peter Zijlstra
Mike Turquette
Abhilash Kesavan
Matias Bjørling
Ingo Tuchscherer
Hannes Frederic Sowa
Robin H. Johnson
Paul E. McKenney
James Solner
Tony Lindgren
Mike Snitzer
Daniel Borkmann
Philipp Zabel
Olof Johansson
Alexandre Courbot
Gerhard Sittig
Stephen Warren
Chanwoo Choi
Wei Ni