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The @odin.com one has been bouncing for a while now, so replace with
new Employer email.
Signed-off-by: James Bottomley <jejb@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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Merge tag 'v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into current
Linux 4.5
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We disabled the ability to enable this driver back in October of 2013,
we should be able to safely remove it at this point. The initial goal
was to remove it in 3.15, so now is the time.
Signed-off-by: Jens Axboe <axboe@fb.com>
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Samuel Ortiz says:
====================
NFC 4.6 pull request
This is a very small one this time, with only 5 patches.
There are a couple of big items that could not be merged/finished
on time.
We have:
- 2 LLCP fixes for a race and a potential OOM.
- 2 cleanups for the pn544 and microread drivers.
- 1 Maintainer addition for the s3fwrn5 driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Nouveau wanted this to avoid some worse conflicts when I merge that.
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Samsung Exynos (and older platforms) improvements for v4.6:
1. Split out Exynos PMU driver implementation from arm/mach-exynos
to the drivers/soc/samsung which will allow re-use of it on ARM64.
2. Use generic DT cpufreq driver on Exynos542x/5800.
3. Minor cleanups.
* tag 'samsung-soc-4.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux:
ARM: s3c24xx: Avoid warning for inb/outb
ARM: SAMSUNG: Remove unused register offset definition
ARM: EXYNOS: Cleanup header files inclusion
drivers: soc: samsung: Enable COMPILE_TEST
MAINTAINERS: Add maintainers entry for drivers/soc/samsung
drivers: soc: Add support for Exynos PMU driver
ARM: EXYNOS: Split up exynos5420 SoC specific PMU data
ARM: EXYNOS: Split up exynos5250 SoC specific PMU data
ARM: EXYNOS: Split up exynos4 SoC specific PMU data
ARM: EXYNOS: Split up exynos3250 SoC specific PMU data
ARM: EXYNOS: Move pmu specific headers under "linux/soc/samsung"
ARM: EXYNOS: Correct header comment in Kconfig file
ARM: EXYNOS: Use generic cpufreq driver for Exynos5422/5800
ARM: EXYNOS: Use generic cpufreq driver for Exynos5420
ARM: s3c64xx: use "depends on" instead of "if" after prompt
ARM: plat-samsung: use to_platform_device()
ARM: EXYNOS: Code cleanup in map.h
ARM: EXYNOS: Remove unused static mapping of CMU for exynos5
Signed-off-by: Olof Johansson <olof@lixom.net>
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I have a couple different emails in here. It's time to make them all
the same.
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
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Jarkko is a main contact to handle i2c-designware driver. Move Mika and me to
designated reviewers which we actualy are.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Pull MTD fixes from Brian Norris:
"Late MTD fix for v4.5:
- A simple error code handling fix for the NAND ECC test; this was a
regression in v4.5-rc1
- A MAINTAINERS update, which might as well go in ASAP"
* tag 'for-linus-20160311' of git://git.infradead.org/linux-mtd:
MAINTAINERS: add a maintainer for the NAND subsystem
mtd: nand: tests: fix regression introduced in mtd_nandectest
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The root complexes used to access off-chip PCIe devices (called PEM units
in the hardware manuals) on some Cavium ThunderX processors require quirky
access methods for the config space of the PCIe bridge.
Add a driver to provide these config space accessor functions. Use the
pci-host-common code to configure the PCI machinery.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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Move pci_host_common_probe() and associated functions to pci-host-common.c,
where it can be shared with other drivers. Make it public (not static)
and update Kconfig and Makefile to build it. No functional change
intended.
[bhelgaas: split into separate patch, changelog]
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Will Deacon <will.deacon@arm.com>
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This patch introduces the basics for a new module called rdma_vt. This new
driver is a software implementation of the InfiniBand verbs and aims to
replace the multiple implementations that exist and duplicate each others'
code.
While the call to actually register the device with the IB core happens in
rdma_vt, most of the work is still done in the drivers themselves. This
will be changing in a follow on patch this is just laying the groundwork
for this infrastructure.
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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To avoid changes to input bindings not reaching linux-input reviewers
add an appropriate file pattern to the MAINTAINERS entry.
Reported-by: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Add myself and Felix as the Maintainers for the MediaTek ethernet driver.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add myself as the maintainer of the NAND subsystem.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Richard Weinberger <richard@nod.at>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Add Krzysztof Opasiak as maintainer of S3FWRN5 driver.
Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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Add myself as co-maintainer for the remote processor related subsystems,
as agreed with Ohad.
Acked-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
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Originally I only wanted to drop the unneeded inclusion of
<linux/i2c.h>, but then noticed that struct
microread_nfc_platform_data isn't actually used, and
MICROREAD_DRIVER_NAME is redefined in the only file where it is used,
so we can get rid of the header file and dead code altogether.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Cc: Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
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Both are maintained by same team.
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Reviewed-by: Gerry Morong <gerry.morong@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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Several cases of overlapping changes, as well as one instance
(vxlan) of a bug fix in 'net' overlapping with code movement
in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Pull networking fixes from David Miller:
1) Fix ordering of WEXT netlink messages so we don't see a newlink
after a dellink, from Johannes Berg.
2) Out of bounds access in minstrel_ht_set_best_prob_rage, from
Konstantin Khlebnikov.
3) Paging buffer memory leak in iwlwifi, from Matti Gottlieb.
4) Wrong units used to set initial TCP rto from cached metrics, also
from Konstantin Khlebnikov.
5) Fix stale IP options data in the SKB control block from leaking
through layers of encapsulation, from Bernie Harris.
6) Zero padding len miscalculated in bnxt_en, from Michael Chan.
7) Only CHECKSUM_PARTIAL packets should be passed down through GSO, fix
from Hannes Frederic Sowa.
8) Fix suspend/resume with JME networking devices, from Diego Violat
and Guo-Fu Tseng.
9) Checksums not validated properly in bridge multicast support due to
the placement of the SKB header pointers at the time of the check,
fix from Álvaro Fernández Rojas.
10) Fix hang/tiemout with r8169 if a stats fetch is done while the
device is runtime suspended. From Chun-Hao Lin.
11) The forwarding database netlink dump facilities don't track the
state of the dump properly, resulting in skipped/missed entries.
From Minoura Makoto.
12) Fix regression from a recent 3c59x bug fix, from Neil Horman.
13) Fix list corruption in bna driver, from Ivan Vecera.
14) Big endian machines crash on vlan add in bnx2x, fix from Michal
Schmidt.
15) Ethtool RSS configuration not propagated properly in mlx5 driver,
from Tariq Toukan.
16) Fix regression in PHY probing in stmmac driver, from Gabriel
Fernandez.
17) Fix SKB tailroom calculation in igmp/mld code, from Benjamin
Poirier.
18) A past change to skip empty routing headers in ipv6 extention header
parsing accidently caused fragment headers to not be matched any
longer. Fix from Florian Westphal.
19) eTSEC-106 erratum needs to be applied to more gianfar chips, from
Atsushi Nemoto.
20) Fix netdev reference after free via workqueues in usb networking
drivers, from Oliver Neukum and Bjørn Mork.
21) mdio->irq is now an array rather than a pointer to dynamic memory,
but several drivers were still trying to free it :-/ Fixes from
Colin Ian King.
22) act_ipt iptables action forgets to set the family field, thus LOG
netfilter targets don't work with it. Fix from Phil Sutter.
23) SKB leak in ibmveth when skb_linearize() fails, from Thomas Falcon.
24) pskb_may_pull() cannot be called with interrupts disabled, fix code
that tries to do this in vmxnet3 driver, from Neil Horman.
25) be2net driver leaks iomap'd memory on removal, fix from Douglas
Miller.
26) Forgotton RTNL mutex unlock in ppp_create_interface() error paths,
from Guillaume Nault.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (97 commits)
ppp: release rtnl mutex when interface creation fails
cdc_ncm: do not call usbnet_link_change from cdc_ncm_bind
tcp: fix tcpi_segs_in after connection establishment
net: hns: fix the bug about loopback
jme: Fix device PM wakeup API usage
jme: Do not enable NIC WoL functions on S0
udp6: fix UDP/IPv6 encap resubmit path
be2net: Don't leak iomapped memory on removal.
vmxnet3: avoid calling pskb_may_pull with interrupts disabled
net: ethernet: Add missing MFD_SYSCON dependency on HAS_IOMEM
ibmveth: check return of skb_linearize in ibmveth_start_xmit
cdc_ncm: toggle altsetting to force reset before setup
usbnet: cleanup after bind() in probe()
mlxsw: pci: Correctly determine if descriptor queue is full
mlxsw: spectrum: Always decrement bridge's ref count
tipc: fix nullptr crash during subscription cancel
net: eth: altera: do not free array priv->mdio->irq
net/ethoc: do not free array priv->mdio->irq
net: sched: fix act_ipt for LOG target
asix: do not free array priv->mdio->irq
...
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Signed-off-by: Shaohua Li <shli@fb.com>
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Pull jffs2 fixes from David Woodhouse:
"This contains two important JFFS2 fixes marked for stable:
- a lock ordering problem between the page lock and the internal
f->sem mutex, which was causing occasional deadlocks in garbage
collection
- a scan failure causing moved directories to sometimes end up
appearing to have hard links.
There are also a couple of trivial MAINTAINERS file updates"
* tag 'for-linus-20160304' of git://git.infradead.org/linux-mtd:
MAINTAINERS: add maintainer entry for FREESCALE GPMI NAND driver
Fix directory hardlinks from deleted directories
jffs2: Fix page lock / f->sem deadlock
Revert "jffs2: Fix lock acquisition order bug in jffs2_write_begin"
MAINTAINERS: update Han's email
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Rolf is no longer in his previous role at Netronome and as far as I know no
longer working on the NFP driver. Thus it does not seem appropriate for him
to be a co-maintainer anymore.
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The usbip_protocol.txt, a document which describes usbip's
inner workings is currently located in the projects source
directory (drivers/usb/usbip/...). This patch moves it to
Documentation/usb.
This discussion was brought up by Guy Harris [0] during the
review of the USBIP dissector I wrote. For anyone interested:
support is available with the latest wireshark master/dev tree.
Simply select a packet from the usbip's tcp-stream you are
intrested on and select the USBIP as the protocol in the
"Decode As" dialog box [1].
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
[0] <https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=12127#c2>
[1] <https://www.wireshark.org/docs/wsug_html_chunked/ChCustProtocolDissectionSection.html#ChAdvDecodeAs>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Add a maintainer entry for FREESCALE FEC ethernet driver and add myself
as a maintainer.
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Acked-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Johan Hedberg says:
====================
pull request: bluetooth-next 2016-03-01
Here's our main set of Bluetooth & 802.15.4 patches for the 4.6 kernel.
- New Bluetooth HCI driver for Intel/AG6xx controllers
- New Broadcom ACPI IDs
- LED trigger support for indicating Bluetooth powered state
- Various fixes in mac802154, 6lowpan and related drivers
- New USB IDs for AR3012 Bluetooth controllers
Please let me know if there are any issues pulling. Thanks.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Move driver to drivers.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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Acked-by: Chien Yen <chien.yen@oracle.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Johannes Berg says:
====================
Here are a few more fixes for the current cycle:
* check GCMP encryption vs. fragmentation properly; we'd found
this problem quite a while ago but waited for the 802.11 spec
to be updated
* fix RTS/CTS logic in minstrel_ht
* fix RX of certain public action frames in AP mode
* add mac80211_hwsim to MAC80211 in MAINTAINERS, this helps
the kbuild robot pick up the right tree for it
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Since I maintain this driver as part of mac80211, add it to
the file list for mac80211; this helps submitters send it to
me instead of Kalle and also makes the build robot apply the
patches for it on the right tree for build attempts.
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Kees writes:
Become maintainer, add hardening tests for use-after-free and atomic wrapping.
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We want the fixes in here, and others are sending us pull requests based
on this kernel tree.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We want the USB fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We want the staging fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Updated GIT and patchwork location both of which were out-of-sync or
actually patchwork location was incorrect.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
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Antonio Quartulli says:
====================
batman-adv 20160229
this is our (hopefully) latest batch of patches intended for net-next.
With this patchset we finally introduce B.A.T.M.A.N. V: the latest
version of our routing protocol.
Technical documentation describing the protocol in more detail can
be found in our wiki[1][2][3][4].
For what concerns this pull request, you can find the high level
description right below.
[1] https://www.open-mesh.org/projects/batman-adv/wiki/BATMAN_V
[2] https://www.open-mesh.org/projects/batman-adv/wiki/OGMv2
[3] https://www.open-mesh.org/projects/batman-adv/wiki/ELP
[4] https://www.open-mesh.org/projects/batman-adv/wiki/BATMAN_V_Tests
...
With this patchset we finally introduce our new routing protocol:
B.A.T.M.A.N. V. Its implementation started quite some years ago,
but due to the big changes being introduced it took a while to be
discussed, designed, worked, re-worked, tested and debugged (well,
we're never done with the latest). The entire operation has
basically been a team work involving all the core contributors
together with other people interested in the project.
The new protocol is divided into two main subcomponents, called
respectively ELP and OGMv2. The former is in charge of
dealing with the neighbour discovery and link quality estimation,
while the latter implements the algorithm that spreads the
metrics around the network and computes optimal paths.
The biggest change introduced with B.A.T.M.A.N. V is the new
metric: the protocol won't rely on packet loss anymore, but it
will use the estimated throughput extracted directly from the
wifi driver (when available) by querying cfg80211.
Batman-adv will also send some unicast probing packets when
an interface is not used for payload traffic to make sure that
such values are current.
The new protocol can be compiled-in or not like other
features we have and when selected will pull in CFG80211 as
dependency for the reason described above.
Thanks to the big work brought up in the past by Marek Lindner,
batman-adv can easily deal several protocol implementations,
therefore compiling in this new version does not exclude the
older.
This means that the user is offered the option to choose
the protocol when creating the mesh interface (default is the
old one to keep backward compatibility).
Along with the protocol there are some sysfs knobs that are
introduced to fine tune some of its behaviours, but users
are recommended to keep the default values unless they know
what they are doing.
The last patch is about advertising our own patchwork platform
(thanks to Sven Eckelmann for having set that up!) in the
MAINTAINERS file.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Officially claim maintainership over the LKDTM code.
Signed-off-by: Kees Cook <keescook@chromium.org>
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Introduce devlink infrastructure for drivers to register and expose to
userspace via generic Netlink interface.
There are two basic objects defined:
devlink - one instance for every "parent device", for example switch ASIC
devlink port - one instance for every physical port of the device.
This initial portion implements basic get/dump of objects to userspace.
Also, port splitter and port type setting is implemented.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The WinSystems EBC-C384 has an onboard watchdog timer. The timeout range
supported by the watchdog timer is 1 second to 255 minutes. Timeouts
under 256 seconds have a 1 second granularity, while the rest have a 1
minute granularity.
This driver adds watchdog timer support for this onboard watchdog timer.
The timeout may be configured via the timeout module parameter.
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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Add maintainers for Microchip LAN78XX.
UNGLinuxDriver@microchip.com is alias email which goes to current
developers work for Microchip Network related products.
Signed-off-by: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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up the maintainer role for SDHCI. I am very pleased that Adrian Hunter
volunteered and accepted the challenge!
The SDHCI code is currently in quite poor quality, but we have agreed on
a way forward to try to reach a point where the SDHCI core becomes more of
a set of library functions. Each SDHCI driver variant can then decide
which functions to use and allows it to implement variant specific code,
without needing to also change SDHCI core code.
In the end we aim to get better optimized and maintainable code.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
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Alexander volunteered to review perf (kernel) patches.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
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This adds a host tool named objtool which has a "check" subcommand which
analyzes .o files to ensure the validity of stack metadata. It enforces
a set of rules on asm code and C inline assembly code so that stack
traces can be reliable.
For each function, it recursively follows all possible code paths and
validates the correct frame pointer state at each instruction.
It also follows code paths involving kernel special sections, like
.altinstructions, __jump_table, and __ex_table, which can add
alternative execution paths to a given instruction (or set of
instructions). Similarly, it knows how to follow switch statements, for
which gcc sometimes uses jump tables.
Here are some of the benefits of validating stack metadata:
a) More reliable stack traces for frame pointer enabled kernels
Frame pointers are used for debugging purposes. They allow runtime
code and debug tools to be able to walk the stack to determine the
chain of function call sites that led to the currently executing
code.
For some architectures, frame pointers are enabled by
CONFIG_FRAME_POINTER. For some other architectures they may be
required by the ABI (sometimes referred to as "backchain pointers").
For C code, gcc automatically generates instructions for setting up
frame pointers when the -fno-omit-frame-pointer option is used.
But for asm code, the frame setup instructions have to be written by
hand, which most people don't do. So the end result is that
CONFIG_FRAME_POINTER is honored for C code but not for most asm code.
For stack traces based on frame pointers to be reliable, all
functions which call other functions must first create a stack frame
and update the frame pointer. If a first function doesn't properly
create a stack frame before calling a second function, the *caller*
of the first function will be skipped on the stack trace.
For example, consider the following example backtrace with frame
pointers enabled:
[<ffffffff81812584>] dump_stack+0x4b/0x63
[<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
[<ffffffff8127f568>] seq_read+0x108/0x3e0
[<ffffffff812cce62>] proc_reg_read+0x42/0x70
[<ffffffff81256197>] __vfs_read+0x37/0x100
[<ffffffff81256b16>] vfs_read+0x86/0x130
[<ffffffff81257898>] SyS_read+0x58/0xd0
[<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
It correctly shows that the caller of cmdline_proc_show() is
seq_read().
If we remove the frame pointer logic from cmdline_proc_show() by
replacing the frame pointer related instructions with nops, here's
what it looks like instead:
[<ffffffff81812584>] dump_stack+0x4b/0x63
[<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
[<ffffffff812cce62>] proc_reg_read+0x42/0x70
[<ffffffff81256197>] __vfs_read+0x37/0x100
[<ffffffff81256b16>] vfs_read+0x86/0x130
[<ffffffff81257898>] SyS_read+0x58/0xd0
[<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
Notice that cmdline_proc_show()'s caller, seq_read(), has been
skipped. Instead the stack trace seems to show that
cmdline_proc_show() was called by proc_reg_read().
The benefit of "objtool check" here is that because it ensures that
*all* functions honor CONFIG_FRAME_POINTER, no functions will ever[*]
be skipped on a stack trace.
[*] unless an interrupt or exception has occurred at the very
beginning of a function before the stack frame has been created,
or at the very end of the function after the stack frame has been
destroyed. This is an inherent limitation of frame pointers.
b) 100% reliable stack traces for DWARF enabled kernels
This is not yet implemented. For more details about what is planned,
see tools/objtool/Documentation/stack-validation.txt.
c) Higher live patching compatibility rate
This is not yet implemented. For more details about what is planned,
see tools/objtool/Documentation/stack-validation.txt.
To achieve the validation, "objtool check" enforces the following rules:
1. Each callable function must be annotated as such with the ELF
function type. In asm code, this is typically done using the
ENTRY/ENDPROC macros. If objtool finds a return instruction
outside of a function, it flags an error since that usually indicates
callable code which should be annotated accordingly.
This rule is needed so that objtool can properly identify each
callable function in order to analyze its stack metadata.
2. Conversely, each section of code which is *not* callable should *not*
be annotated as an ELF function. The ENDPROC macro shouldn't be used
in this case.
This rule is needed so that objtool can ignore non-callable code.
Such code doesn't have to follow any of the other rules.
3. Each callable function which calls another function must have the
correct frame pointer logic, if required by CONFIG_FRAME_POINTER or
the architecture's back chain rules. This can by done in asm code
with the FRAME_BEGIN/FRAME_END macros.
This rule ensures that frame pointer based stack traces will work as
designed. If function A doesn't create a stack frame before calling
function B, the _caller_ of function A will be skipped on the stack
trace.
4. Dynamic jumps and jumps to undefined symbols are only allowed if:
a) the jump is part of a switch statement; or
b) the jump matches sibling call semantics and the frame pointer has
the same value it had on function entry.
This rule is needed so that objtool can reliably analyze all of a
function's code paths. If a function jumps to code in another file,
and it's not a sibling call, objtool has no way to follow the jump
because it only analyzes a single file at a time.
5. A callable function may not execute kernel entry/exit instructions.
The only code which needs such instructions is kernel entry code,
which shouldn't be be in callable functions anyway.
This rule is just a sanity check to ensure that callable functions
return normally.
It currently only supports x86_64. I tried to make the code generic so
that support for other architectures can hopefully be plugged in
relatively easily.
On my Lenovo laptop with a i7-4810MQ 4-core/8-thread CPU, building the
kernel with objtool checking every .o file adds about three seconds of
total build time. It hasn't been optimized for performance yet, so
there are probably some opportunities for better build performance.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris J Arges <chris.j.arges@canonical.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/f3efb173de43bd067b060de73f856567c0fa1174.1456719558.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Pull USB fixes from Greg KH:
"Here are a few USB fixes for 4.5-rc6
They fix a reported bug for some USB 3 devices by reverting the recent
patch, a MAINTAINERS change for some drivers, some new device ids, and
of course, the usual bunch of USB gadget driver fixes.
All have been in linux-next for a while with no reported issues"
* tag 'usb-4.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
MAINTAINERS: drop OMAP USB and MUSB maintainership
usb: musb: fix DMA for host mode
usb: phy: msm: Trigger USB state detection work in DRD mode
usb: gadget: net2280: fix endpoint max packet for super speed connections
usb: gadget: gadgetfs: unregister gadget only if it got successfully registered
usb: gadget: remove driver from pending list on probe error
Revert "usb: hub: do not clear BOS field during reset device"
usb: chipidea: fix return value check in ci_hdrc_pci_probe()
usb: chipidea: error on overflow for port_test_write
USB: option: add "4G LTE usb-modem U901"
USB: cp210x: add IDs for GE B650V3 and B850V3 boards
USB: option: add support for SIM7100E
usb: musb: Fix DMA desired mode for Mentor DMA engine
usb: gadget: fsl_qe_udc: fix IS_ERR_VALUE usage
usb: dwc2: USB_DWC2 should depend on HAS_DMA
usb: dwc2: host: fix the data toggle error in full speed descriptor dma
usb: dwc2: host: fix logical omissions in dwc2_process_non_isoc_desc
usb: dwc3: Fix assignment of EP transfer resources
usb: dwc2: Add extra delay when forcing dr_mode
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Pull ARM SoC fixes from Olof Johansson:
"We didn't have a batch last week, so this one is slightly larger.
None of them are scary though, a handful of fixes for small DT pieces,
replacing properties with newer conventions.
Highlights:
- N900 fix for setting system revision
- onenand init fix to avoid filesystem corruption
- Clock fix for audio on Beaglebone-x15
- Fixes on shmobile to deal with CONFIG_DEBUG_RODATA (default y in 4.6)
+ misc smaller stuff"
* tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
MAINTAINERS: Extend info, add wiki and ml for meson arch
MAINTAINERS: alpine: add a new maintainer and update the entry
ARM: at91/dt: fix typo in sama5d2 pinmux descriptions
ARM: OMAP2+: Fix onenand initialization to avoid filesystem corruption
Revert "regulator: tps65217: remove tps65217.dtsi file"
ARM: shmobile: Remove shmobile_boot_arg
ARM: shmobile: Move shmobile_smp_{mpidr, fn, arg}[] from .text to .bss
ARM: shmobile: r8a7779: Remove remainings of removed SCU boot setup code
ARM: shmobile: Move shmobile_scu_base from .text to .bss
ARM: OMAP2+: Fix omap_device for module reload on PM runtime forbid
ARM: OMAP2+: Improve omap_device error for driver writers
ARM: DTS: am57xx-beagle-x15: Select SYS_CLK2 for audio clocks
ARM: dts: am335x/am57xx: replace gpio-key,wakeup with wakeup-source property
ARM: OMAP2+: Set system_rev from ATAGS for n900
ARM: dts: orion5x: fix the missing mtd flash on linkstation lswtgl
ARM: dts: kirkwood: use unique machine name for ds112
ARM: dts: imx6: remove bogus interrupt-parent from CAAM node
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James Bottomley
Mike Marshall
Jens Axboe
David S. Miller
Dave Airlie
Mark Brown
Olof Johansson
Kevin Hilman
Andy Shevchenko
Linus Torvalds
David Daney
Dennis Dalessandro
Andreas Färber
John Crispin
Boris BREZILLON
Robert Baldyga
Bjorn Andersson
Jean Delvare
Alex Deucher
Don Brace
Ingo Molnar
Shaohua Li
Simon Horman
Christian Lamparter
Nimrod Andy
Antti Palosaari
santosh.shilimkar@oracle.com
Johannes Berg
Greg Kroah-Hartman
Jarkko Sakkinen
Kees Cook
Jiri Pirko
William Breathitt Gray
Woojung.Huh@microchip.com
Ulf Hansson
Peter Zijlstra
Sven Eckelmann
Josh Poimboeuf