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2007-10-17ext4: show all mount optionsMiklos Szeredi2-0/+73
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17ext3: show all mount optionsMiklos Szeredi2-0/+71
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17ext2: show all mount optionsMiklos Szeredi2-2/+60
Using mtab is problematic for various reasons, one of them is that unprivileged mounts won't turn up in there. So we want to get rid of it, and use /proc/mounts instead. But most filesystems are lazy, and are not showing all mount options. Which means, that without mtab, the user won't be able to see some or all of the options. It would be nice if the generic code could remember the mount options, and show them without the need to add extra code to filesystems. But this is not easy, because different filesystems handle mount options given options, and not tough the rest. This is not taken into account by mount(8) either, so /etc/mtab will be broken in this case. This series fixes up ->show_options() in ext[234]. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17convert ill defined log2() to ilog2()Fengguang Wu4-18/+9
It's *wrong* to have #define log2(n) ffz(~(n)) It should be *reversed*: #define log2(n) flz(~(n)) or #define log2(n) fls(n) or just use ilog2(n) defined in linux/log2.h. This patch follows the last solution, recommended by Andrew Morton. Cc: <linux-ext4@vger.kernel.org> Cc: Mingming Cao <cmm@us.ibm.com> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Chris Ahna <christopher.j.ahna@intel.com> Cc: David Mosberger-Tang <davidm@hpl.hp.com> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Dave Airlie <airlied@linux.ie> Cc: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17time: simplify smp_call_function_single() call sequenceAvi Kivity1-13/+4
smp_call_function_single() now knows how to call the function on the current cpu. Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Clean up duplicate includes in kernel/Jesper Juhl7-7/+0
This patch cleans up duplicate includes in kernel/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Satyam Sharma <ssatyam@cse.iitk.ac.in> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Clean up duplicate includes in fs/ecryptfs/Jesper Juhl1-1/+0
This patch cleans up duplicate includes in fs/ecryptfs/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Cc: Michael A Halcrow <mahalcro@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Clean up duplicate includes in fs/Jesper Juhl2-2/+0
This patch cleans up duplicate includes in fs/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Clean up duplicate includes in drivers/w1/Jesper Juhl1-1/+0
This patch cleans up duplicate includes in drivers/w1/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Clean up duplicate includes in drivers/char/Jesper Juhl3-6/+0
This patch cleans up duplicate includes in drivers/char/ Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Remove sysctl.h from fs.hAlexey Dobriyan1-2/+2
Rrrr, addition of sysctl.h to fs.h was't very smart, because simple editing of the former will buy you big recompile, where it shouldn't have to. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17pcmcia: CompactFlash driver for PA Semi Electra boardsOlof Johansson4-0/+441
Driver for the CompactFlash slot on the PA Semi Electra eval board. It's a simple device sitting on localbus, with interrupts and detect/voltage control over GPIO. The driver is implemented as an of_platform driver, and adds localbus as a bus being probed by the of_platform framework. [akpm@linux-foundation.org: cleanups] [olof@lixom.net: fix build] Signed-off-by: Olof Johansson <olof@lixom.net> Cc: Christoph Hellwig <hch@infradead.org> Cc: Milton Miller <miltonm@bga.com> Cc: Kumar Gala <galak@gate.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fs: use kmem_cache_zalloc insteadDenis Cheng1-2/+1
Signed-off-by: Denis Cheng <crquan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fs/proc/mmu.c: headers butcheryAlexey Dobriyan1-19/+2
fs/proc/mmu.c consists of only one function which uses only: 1) struct vmalloc_info * 2) struct vm_struct * 3) struct vmalloc_info 4) vmlist 5) VMALLOC_TOTAL, VMALLOC_START, VMALLOC_END 6) read_lock, read_unlock 7) vmlist_lock 8) struct vm_struct This gives us linux/spinlock.h, asm/pgtable.h, "internal.h", linux/vmalloc.h. asm/pgtable.h uses PKMAP_BASE on i386, for which asm/highmem.h is needed. But, linux/highmem.h is actually used to make it compile everywhere. I'll deal later with this particular i386 surprise. Cross-compile tested on many archs and configs. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17do_poll: return -EINTR when signalledOleg Nesterov1-7/+7
do_poll() checks signal_pending() but returns 0 when interrupted. This means the caller has to check signal_pending() again. Change it to return -EINTR when signal_pending() and count == 0. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Andi Kleen <ak@suse.de> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Vadim Lobanov <vlobanov@speakeasy.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17do_sys_poll: simplify playing with on-stack dataOleg Nesterov1-56/+36
Cleanup. Lessens both the source and compiled code (100 bytes) and imho makes the code much more understandable. With this patch "struct poll_list *head" always points to on-stack stack_pps, so we can remove all "is it on-stack" and "was it initialized" checks. Also, move poll_initwait/poll_freewait and -EINTR detection closer to the do_poll()'s callsite. [akpm@linux-foundation.org: fix warning (size_t != uint)] Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Looks-good-to: Andi Kleen <ak@suse.de> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Vadim Lobanov <vlobanov@speakeasy.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Remove unneeded lock_kernel() in driver/block/loop.cDiego Woitasen1-2/+0
Signed-off-by: Diego Woitasen <diego@woitasen.com.ar> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17KCONFIG: Make "Instrumentation support" non-EXPERIMENTALRobert P. J. Day6-6/+0
It makes more sense to make instrumentation support experimental on a case-by-case basis. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: Andi Kleen <ak@suse.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fs: mark nibblemap constPhilippe De Muyter5-5/+5
Signed-off-by: Philippe De Muyter <phdm@macqel.be> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fs/romfs/inode.c: trivial improvementsWANG Cong1-2/+2
- There are no lists in fs/romfs/inode.c, so using list_entry is a bit confusing. Replace it with container_of. - It is unnecessary to cast the return value of kmem_cache_alloc, since it returns a void* pointer. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17nbd: change a parameter's type to remove a memcpy callDenis Cheng1-5/+3
This memcpy looks so strange, in fact it's merely a pointer dereference, so I change the parameter's type to refer it more directly, this could make the memcpy not needed anymore. In the function nbd_read_stat where nbd_find_request is only once called, the parameter served should be transformed accordingly. Signed-off-by: Denis Cheng <crquan@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17nbd: use list_for_each_entry_safe to make it more consolidated and readableDenis Cheng1-4/+2
Thus the traverse of the loop may delete nodes, use the safe version. Signed-off-by: Denis Cheng <crquan@gmail.com> Cc: Paul Clements <paul.clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17kill DECLARE_MUTEX_LOCKEDChristoph Hellwig24-24/+3
DECLARE_MUTEX_LOCKED was used for semaphores used as completions and we've got rid of them. Well, except for one in libusual that the maintainer explicitly wants to keep as semaphore. So convert that useage to an explicit sema_init and kill of DECLARE_MUTEX_LOCKED so that new code is reminded to use a completion. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: "Satyam Sharma" <satyam.sharma@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17unexport asm/shmparam.hOlaf Hering4-4/+2
SHMLBA cant possible be used in userspace, see sparc versions of that header. Do not export asm/shmparam.h during make headers_install_all This removes another uservisible place of PAGE_SIZE Signed-off-by: Olaf Hering <olaf@aepfle.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Driver for the Atmel on-chip SSC on AT32AP and AT91Hans-Christian Egtvedt4-0/+499
The Synchronous Serial Controller (SSC) on Atmel microprocessors are capable of tranceiving many frame based protocols, like I2S. Tested on the AT32AP7000/ATSTK1000. This driver is used in the ALSA sound driver for the AT73C213 external DAC on the ATSTK1000 development board for AVR32. This sound driver will be submitted soon. Hardware documentation can be found in the AT32AP7000 data sheet, which can be downloaded from http://www.atmel.com/dyn/products/datasheets.asp?family_id=682 [akpm@linux-foundation.org: init spinlock at compile time] Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: David Brownell <david-b@pacbell.net> Cc: Andrew Victor <andrew@sanpeople.com> Cc: Patrice Vilchez <patrice.vilchez@rfo.atmel.com> Cc: Nicolas Ferre <nicolas.ferre@rfo.atmel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Force erroneous inclusions of compiler-*.h files to be errorsRobert P. J. Day4-4/+12
Replace worthless comments with actual preprocessor errors when including the wrong versions of the compiler.h files. [akpm@linux-foundation.org: make it work] Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17zisofs use mutex instead of semaphoreDave Young1-20/+5
Use mutex instead of semaphore in fs/isofs/compress.c, and remove an unnecessary variable. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17SLAB_PANIC more (proc, posix-timers, shmem)Alexey Dobriyan3-7/+4
These aren't modular, so SLAB_PANIC is OK. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17softlockup: add a /proc tuning parameterRavikiran G Thirumalai4-9/+40
Control the trigger limit for softlockup warnings. This is useful for debugging softlockups, by lowering the softlockup_thresh to identify possible softlockups earlier. This patch: 1. Adds a sysctl softlockup_thresh with valid values of 1-60s (Higher value to disable false positives) 2. Changes the softlockup printk to print the cpu softlockup time [akpm@linux-foundation.org: Fix various warnings and add definition of "two"] Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Shai Fultheim <shai@scalex86.org> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17softlockup watchdog: style cleanupsIngo Molnar1-7/+7
kernel/softirq.c grew a few style uncleanlinesses in the past few months, clean that up. No functional changes: text data bss dec hex filename 1126 76 4 1206 4b6 softlockup.o.before 1129 76 4 1209 4b9 softlockup.o.after ( the 3 bytes .text increase is due to the "<1>" appended to one of the printk messages. ) Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17softlockup: improve debug outputIngo Molnar1-7/+13
Improve the debuggability of kernel lockups by enhancing the debug output of the softlockup detector: print the task that causes the lockup and try to print a more intelligent backtrace. The old format was: BUG: soft lockup detected on CPU#1! [<c0105e4a>] show_trace_log_lvl+0x19/0x2e [<c0105f43>] show_trace+0x12/0x14 [<c0105f59>] dump_stack+0x14/0x16 [<c015f6bc>] softlockup_tick+0xbe/0xd0 [<c013457d>] run_local_timers+0x12/0x14 [<c01346b8>] update_process_times+0x3e/0x63 [<c0145fb8>] tick_sched_timer+0x7c/0xc0 [<c0140a75>] hrtimer_interrupt+0x135/0x1ba [<c011bde7>] smp_apic_timer_interrupt+0x6e/0x80 [<c0105aa3>] apic_timer_interrupt+0x33/0x38 [<c0104f8a>] syscall_call+0x7/0xb ======================= The new format is: BUG: soft lockup detected on CPU#1! [prctl:2363] Pid: 2363, comm: prctl EIP: 0060:[<c013915f>] CPU: 1 EIP is at sys_prctl+0x24/0x18c EFLAGS: 00000213 Not tainted (2.6.22-cfs-v20 #26) EAX: 00000001 EBX: 000003e7 ECX: 00000001 EDX: f6df0000 ESI: 000003e7 EDI: 000003e7 EBP: f6df0fb0 DS: 007b ES: 007b FS: 00d8 CR0: 8005003b CR2: 4d8c3340 CR3: 3731d000 CR4: 000006d0 [<c0105e4a>] show_trace_log_lvl+0x19/0x2e [<c0105f43>] show_trace+0x12/0x14 [<c01040be>] show_regs+0x1ab/0x1b3 [<c015f807>] softlockup_tick+0xef/0x108 [<c013457d>] run_local_timers+0x12/0x14 [<c01346b8>] update_process_times+0x3e/0x63 [<c0145fcc>] tick_sched_timer+0x7c/0xc0 [<c0140a89>] hrtimer_interrupt+0x135/0x1ba [<c011bde7>] smp_apic_timer_interrupt+0x6e/0x80 [<c0105aa3>] apic_timer_interrupt+0x33/0x38 [<c0104f8a>] syscall_call+0x7/0xb ======================= Note that in the old format we only knew that some system call locked up, we didnt know _which_. With the new format we know that it's at a specific place in sys_prctl(). [which was where i created an artificial kernel lockup to test the new format.] This is also useful if the lockup happens in user-space - the user-space EIP (and other registers) will be printed too. (such a lockup would either suggest that the task was running at SCHED_FIFO:99 and looping for more than 10 seconds, or that the softlockup detector has a false-positive.) The task name is printed too first, just in case we dont manage to print a useful backtrace. [satyam@infradead.org: fix warning] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Satyam Sharma <satyam@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17softlockup: make asm/irq_regs.h available on every platformIngo Molnar4-0/+4
The softlockup detector would like to use get_irq_regs(), so generalize the availability on every Linux architecture. (It is fine for an architecture to always return NULL to get_irq_regs(), which it does by default.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Ian Molton <spyro@f2s.com> Cc: Kumar Gala <galak@gate.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fix the softlockup watchdog to actually workIngo Molnar1-3/+4
this Xen related commit: commit 966812dc98e6a7fcdf759cbfa0efab77500a8868 Author: Jeremy Fitzhardinge <jeremy@goop.org> Date: Tue May 8 00:28:02 2007 -0700 Ignore stolen time in the softlockup watchdog broke the softlockup watchdog to never report any lockups. (!) print_timestamp defaults to 0, this makes the following condition always true: if (print_timestamp < (touch_timestamp + 1) || and we'll in essence never report soft lockups. apparently the functionality of the soft lockup watchdog was never actually tested with that patch applied ... Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17softlockup: use cpu_clock() instead of sched_clock()Ingo Molnar1-4/+6
sched_clock() is not a reliable time-source, use cpu_clock() instead. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Remove workaround for unimmunized rcu_dereference from mce_log()Paul E. McKenney1-3/+0
Remove the rmb() from mce_log(), since the immunized version of rcu_dereference() makes it unnecessary. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Immunize rcu_dereference() against crazy compiler writersPaul E. McKenney1-1/+13
Turns out that compiler writers are a bit more aggressive about optimizing than one might expect. This patch prevents a number of such optimizations from messing up rcu_deference(). This is not merely a theoretical problem, as evidenced by the rmb() in mce_log(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Josh Triplett <josh@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Make unregister_binfmt() return voidAlexey Dobriyan3-4/+3
list_del() hardly can fail, so checking for return value is pointless (and current code always return 0). Nobody really cared that return value anyway. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17Use list_head in binfmt handlingAlexey Dobriyan4-33/+17
Switch single-linked binfmt formats list to usual list_head's. This leads to one-liners in register_binfmt() and unregister_binfmt(). The downside is one pointer more in struct linux_binfmt. This is not a problem, since the set of registered binfmts on typical box is very small -- (ELF + something distro enabled for you). Test-booted, played with executable .txt files, modprobe/rmmod binfmt_misc. Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17fs/reiserfs/: cleanupsAdrian Bunk4-67/+4
- remove the following no longer used functions: - bitmap.c: reiserfs_claim_blocks_to_be_allocated() - bitmap.c: reiserfs_release_claimed_blocks() - bitmap.c: reiserfs_can_fit_pages() - make the following functions static: - inode.c: restart_transaction() - journal.c: reiserfs_async_progress_wait() Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: Vladimir V. Saveliev <vs@namesys.com> Cc: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17writeback: don't propagate AOP_WRITEPAGE_ACTIVATEAndrew Morton1-1/+3
This is a writeback-internal marker but we're propagating it all the way back to userspace!. Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17mm: document tree_lock->zone.lock lockorderNick Piggin2-0/+2
zone->lock is quite an "inner" lock and mostly constrained to page alloc as well, so like slab locks, it probably isn't something that is critically important to document here. However unlike slab locks, zone lock could be used more widely in future, and page_alloc.c might possibly have more business to do tricky things with pagecache than does slab. So... I don't think it hurts to document it. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17mm: test and set zone reclaim lock before starting reclaimDavid Rientjes2-10/+21
Introduces new zone flag interface for testing and setting flags: int zone_test_and_set_flag(struct zone *zone, zone_flags_t flag) Instead of setting and clearing ZONE_RECLAIM_LOCKED each time shrink_zone() is called, this flag is test and set before starting zone reclaim. Zone reclaim starts in __alloc_pages() when a zone's watermark fails and the system is in zone_reclaim_mode. If it's already in reclaim, there's no need to start again so it is simply considered full for that allocation attempt. There is a change of behavior with regard to concurrent zone shrinking. It is now possible for try_to_free_pages() or kswapd to already be shrinking a particular zone when __alloc_pages() starts zone reclaim. In this case, it is possible for two concurrent threads to invoke shrink_zone() for a single zone. This change forbids a zone to be in zone reclaim twice, which was always the behavior, but allows for concurrent try_to_free_pages() or kswapd shrinking when starting zone reclaim. Cc: Andrea Arcangeli <andrea@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: convert zone_scan_lock from mutex to spinlockDavid Rientjes1-5/+5
There's no reason to sleep in try_set_zone_oom() or clear_zonelist_oom() if the lock can't be acquired; it will be available soon enough once the zonelist scanning is done. All other threads waiting for the OOM killer are also contingent on the exiting task being able to acquire the lock in clear_zonelist_oom() so it doesn't make sense to put it to sleep. Cc: Andrea Arcangeli <andrea@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: add header file to Kbuild as unifdefDavid Rientjes1-0/+1
Preprocess include/linux/oom.h before exporting it to userspace. Cc: Andrea Arcangeli <andrea@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: prevent including sched.h in header fileDavid Rientjes1-2/+5
It's not necessary to include all of linux/sched.h in linux/oom.h. Instead, simply include prototypes for the relevant structs and include linux/types.h for gfp_t. Cc: Andrea Arcangeli <andrea@suse.de> Cc: Christoph Lameter <clameter@sgi.com> Acked-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: do not take callback_mutexDavid Rientjes1-3/+0
Since no task descriptor's 'cpuset' field is dereferenced in the execution of the OOM killer anymore, it is no longer necessary to take callback_mutex. [akpm@linux-foundation.org: restore cpuset_lock for other patches] Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: compare cpuset mems_allowed instead of exclusive ancestorsDavid Rientjes3-35/+16
Instead of testing for overlap in the memory nodes of the the nearest exclusive ancestor of both current and the candidate task, it is better to simply test for intersection between the task's mems_allowed in their task descriptors. This does not require taking callback_mutex since it is only used as a hint in the badness scoring. Tasks that do not have an intersection in their mems_allowed with the current task are not explicitly restricted from being OOM killed because it is quite possible that the candidate task has allocated memory there before and has since changed its mems_allowed. Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: suppress extraneous stack and memory dumpDavid Rientjes1-13/+14
Suppresses the extraneous stack and memory dump when a parallel OOM killing has been found. There's no need to fill the ring buffer with this information if its already been printed and the condition that triggered the previous OOM killer has not yet been alleviated. Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: add oom_kill_allocating_task sysctlDavid Rientjes3-5/+39
Adds a new sysctl, 'oom_kill_allocating_task', which will automatically kill the OOM-triggering task instead of scanning through the tasklist to find a memory-hogging target. This is helpful for systems with an insanely large number of tasks where scanning the tasklist significantly degrades performance. Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-17oom: serialize out of memory callsDavid Rientjes1-2/+12
A final allocation attempt with a very high watermark needs to be attempted before invoking out_of_memory(). OOM killer serialization needs to occur before this final attempt, otherwise tasks attempting to OOM-lock all zones in its zonelist may spin and acquire the lock unnecessarily after the OOM condition has already been alleviated. If the final allocation does succeed, the zonelist is simply OOM-unlocked and __alloc_pages() returns the page. Otherwise, the OOM killer is invoked. If the task cannot acquire OOM-locks on all zones in its zonelist, it is put to sleep and the allocation is retried when it gets rescheduled. One of its zones is already marked as being in the OOM killer so it'll hopefully be getting some free memory soon, at least enough to satisfy a high watermark allocation attempt. This prevents needlessly killing a task when the OOM condition would have already been alleviated if it had simply been given enough time. Cc: Andrea Arcangeli <andrea@suse.de> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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