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2010-05-18Merge branch 'tracing-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: tracing: Fix "integer as NULL pointer" warning. tracing: Fix tracepoint.h DECLARE_TRACE() to allow more than one header tracing: Make the documentation clear on trace_event boot option ring-buffer: Wrap open-coded WARN_ONCE tracing: Convert nop macros to static inlines tracing: Fix sleep time function profiling tracing: Show sample std dev in function profiling tracing: Add documentation for trace commands mod, traceon/traceoff ring-buffer: Make benchmark handle missed events ring-buffer: Make non-consuming read less expensive with lots of cpus. tracing: Add graph output support for irqsoff tracer tracing: Have graph flags passed in to ouput functions tracing: Add ftrace events for graph tracer tracing: Dump either the oops's cpu source or all cpus buffers tracing: Fix uninitialized variable of tracing/trace output
2010-05-18Merge branch 'sched-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (49 commits) stop_machine: Move local variable closer to the usage site in cpu_stop_cpu_callback() sched, wait: Use wrapper functions sched: Remove a stale comment ondemand: Make the iowait-is-busy time a sysfs tunable ondemand: Solve a big performance issue by counting IOWAIT time as busy sched: Intoduce get_cpu_iowait_time_us() sched: Eliminate the ts->idle_lastupdate field sched: Fold updating of the last_update_time_info into update_ts_time_stats() sched: Update the idle statistics in get_cpu_idle_time_us() sched: Introduce a function to update the idle statistics sched: Add a comment to get_cpu_idle_time_us() cpu_stop: add dummy implementation for UP sched: Remove rq argument to the tracepoints rcu: need barrier() in UP synchronize_sched_expedited() sched: correctly place paranioa memory barriers in synchronize_sched_expedited() sched: kill paranoia check in synchronize_sched_expedited() sched: replace migration_thread with cpu_stop stop_machine: reimplement using cpu_stop cpu_stop: implement stop_cpu[s]() sched: Fix select_idle_sibling() logic in select_task_rq_fair() ...
2010-05-18Merge branch 'perf-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (311 commits) perf tools: Add mode to build without newt support perf symbols: symbol inconsistency message should be done only at verbose=1 perf tui: Add explicit -lslang option perf options: Type check all the remaining OPT_ variants perf options: Type check OPT_BOOLEAN and fix the offenders perf options: Check v type in OPT_U?INTEGER perf options: Introduce OPT_UINTEGER perf tui: Add workaround for slang < 2.1.4 perf record: Fix bug mismatch with -c option definition perf options: Introduce OPT_U64 perf tui: Add help window to show key associations perf tui: Make <- exit menus too perf newt: Add single key shortcuts for zoom into DSO and threads perf newt: Exit browser unconditionally when CTRL+C, q or Q is pressed perf newt: Fix the 'A'/'a' shortcut for annotate perf newt: Make <- exit the ui_browser x86, perf: P4 PMU - fix counters management logic perf newt: Make <- zoom out filters perf report: Report number of events, not samples perf hist: Clarify events_stats fields usage ... Fix up trivial conflicts in kernel/fork.c and tools/perf/builtin-record.c
2010-05-18Merge branch 'core-rcu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (24 commits) rcu: remove all rcu head initializations, except on_stack initializations rcu head introduce rcu head init on stack Debugobjects transition check rcu: fix build bug in RCU_FAST_NO_HZ builds rcu: RCU_FAST_NO_HZ must check RCU dyntick state rcu: make SRCU usable in modules rcu: improve the RCU CPU-stall warning documentation rcu: reduce the number of spurious RCU_SOFTIRQ invocations rcu: permit discontiguous cpu_possible_mask CPU numbering rcu: improve RCU CPU stall-warning messages rcu: print boot-time console messages if RCU configs out of ordinary rcu: disable CPU stall warnings upon panic rcu: enable CPU_STALL_VERBOSE by default rcu: slim down rcutiny by removing rcu_scheduler_active and friends rcu: refactor RCU's context-switch handling rcu: rename rcutiny rcu_ctrlblk to rcu_sched_ctrlblk rcu: shrink rcutiny by making synchronize_rcu_bh() be inline rcu: fix now-bogus rcu_scheduler_active comments. rcu: Fix bogus CONFIG_PROVE_LOCKING in comments to reflect reality. rcu: ignore offline CPUs in last non-dyntick-idle CPU check ...
2010-05-18Merge branch 'core-iommu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86/amd-iommu: Add amd_iommu=off command line option iommu-api: Remove iommu_{un}map_range functions x86/amd-iommu: Implement ->{un}map callbacks for iommu-api x86/amd-iommu: Make amd_iommu_iova_to_phys aware of multiple page sizes x86/amd-iommu: Make iommu_unmap_page and fetch_pte aware of page sizes x86/amd-iommu: Make iommu_map_page and alloc_pte aware of page sizes kvm: Change kvm_iommu_map_pages to map large pages VT-d: Change {un}map_range functions to implement {un}map interface iommu-api: Add ->{un}map callbacks to iommu_ops iommu-api: Add iommu_map and iommu_unmap functions iommu-api: Rename ->{un}map function pointers to ->{un}map_range
2010-05-18V4L/DVB: v4l: Add V4L2_CID_IRIS_ABSOLUTE and V4L2_CID_IRIS_RELATIVE controlsLaurent Pinchart
Those control, as their names imply, control the camera aperture settings. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: v4l: add V4L2_PIX_FMT_Y4 and V4L2_PIX_FMT_Y6 pixelformatsHans Verkuil
Old 4 and 6 bit greyscale pixel formats for the old bw-qcam webcam. This is needed to convert it to V4L2. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: em28xx: add em286x/tvp5150 reference designDevin Heitmueller
Add support for design which has an em2863/tvp5150 and uses the standard empia USB ID. In Sander's case, it was branded as an "Eminent model EM3705" Thanks to Sander Van Ginkel for testing and help debugging the support. [mchehab@redhat.com: move it to a vague card number slot (card=29)] Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: saa7134: Use the same name on CARDLIST as found at the driverMauro Carvalho Chehab
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: Fix cx88 and em28xx cardlistsMauro Carvalho Chehab
There are some missing entries there Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: videodev2: introduce a common control for chroma gainDevin Heitmueller
Introduce a new control for modifying the chroma gain. This allows for user intervention in abnormal signal conditions cases where the decoder's chroma AGC cannot compensate and the value needs to be adjusted manually. This work was sponsored by EyeMagnet Limited. Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: gspca - sn9c20x: Add support for cameras using the MT9M112 sensorBrian Johnson
Adds the following models: - 0c45:624c - 0c45:628c - 0458:704a - 0458:704c Signed-off-by: Brian Johnson <brijohn@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: gspca - sonixj: Add webcam 0c45:6142 with sensors gc0307 and po2030nJean-François Moine
Signed-off-by: Jean-François Moine <moinejf@free.fr> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: v4l doc: fix font of field nameHans Verkuil
The field 'reserved' was not tagged as a 'structfield' as it should. This made the text a bit confusing. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-18V4L/DVB: saa7134: add capture boards Hawell HW-404M7 and HW-808M7Vladimir Ermakov
Adds new capture boards Hawell HW-404M7 and HW-808M7. Those cards have 4 or 8 SAA7130 chips and for the work it only needs initialize registers. The value of those registers were dumped under Windows using flytest. But board haven't EEPROM. For the first chip: SAA7130 (0x7130, SubVenID:1131, SubDevID:0000, Rev: 01) I2C slave devices found: No devices GPIO pins: Mode : 0x00389C00 Value: 0x00016C00 Video input: 3 Audio input: Analog Line1 For other chips: SAA7130 (0x7130, SubVenID:1131, SubDevID:0000, Rev: 01) I2C slave devices found: No devices GPIO pins: Mode : 0x00389200 Value: 0x00010000 Video input: 3 Audio input: Analog Line1 Signed-off-by: Vladimir Ermakov <vooon341@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-17Merge branch 'next' into for-linusJames Morris
2010-05-17Merge branch 'devel-stable' into develRussell King
Conflicts: arch/arm/Kconfig arch/arm/include/asm/system.h arch/arm/mm/Kconfig
2010-05-16net: Consistent skb timestampingEric Dumazet
With RPS inclusion, skb timestamping is not consistent in RX path. If netif_receive_skb() is used, its deferred after RPS dispatch. If netif_rx() is used, its done before RPS dispatch. This can give strange tcpdump timestamps results. I think timestamping should be done as soon as possible in the receive path, to get meaningful values (ie timestamps taken at the time packet was delivered by NIC driver to our stack), even if NAPI already can defer timestamping a bit (RPS can help to reduce the gap) Tom Herbert prefer to sample timestamps after RPS dispatch. In case sampling is expensive (HPET/acpi_pm on x86), this makes sense. Let admins switch from one mode to another, using a new sysctl, /proc/sys/net/core/netdev_tstamp_prequeue Its default value (1), means timestamps are taken as soon as possible, before backlog queueing, giving accurate timestamps. Setting a 0 value permits to sample timestamps when processing backlog, after RPS dispatch, to lower the load of the pre-RPS cpu. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-16net: reserve ports for applications using fixed port numbersAmerigo Wang
(Dropped the infiniband part, because Tetsuo modified the related code, I will send a separate patch for it once this is accepted.) This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports which allows users to reserve ports for third-party applications. The reserved ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-14libata: introduce sff_set_devctl() methodSergei Shtylyov
The set of libata's taskfile access methods is clearly incomplete as it lacks a method to write to the device control register -- which forces drivers like 'pata_bf54x' and 'pata_scc' to implement more "high level" (and more weighty) methods like freeze() and postreset(). So, introduce the optional sff_set_devctl() method which the drivers only have to implement if the standard iowrite8() can't be used (just like the existing sff_check_altstatus() method) and make use of it in the freeze() and postreset() method implementations (I could also have used it in softreset() method but it also reads other taskfile registers without using tf_read() making that quite pointless); this makes freeze() method implementations in the 'pata_bf54x' and 'pata_scc' methods virtually identical to ata_sff_freeze(), so we can get rid of them completely. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2010-05-14libata-sff: kill unused ata_bus_reset()Sergei Shtylyov
... since I see no callers of it. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
2010-05-14Add a document describing the padata interfaceJonathan Corbet
This originally appeared as http://lwn.net/Articles/382257/. Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2010-05-13nfsd4: implement reclaim_completeJ. Bruce Fields
This is a mandatory operation. Also, here (not in open) is where we should be committing the reboot recovery information. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2010-05-13sh: fixup the docbook paths for clock framework shuffling.Paul Mundt
Now that the definitions have been consolidated in an alternate header, update the template accordingly. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-05-13Merge commit 'v2.6.34-rc7' into tracing/coreIngo Molnar
Merge reason: Update from -rc5 to -rc7. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-05-12Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: Documentation/feature-removal-schedule.txt drivers/net/wireless/ath/ar9170/usb.c drivers/scsi/iscsi_tcp.c net/ipv4/ipmr.c
2010-05-12revert "procfs: provide stack information for threads" and its fixup commitsRobin Holt
Originally, commit d899bf7b ("procfs: provide stack information for threads") attempted to introduce a new feature for showing where the threadstack was located and how many pages are being utilized by the stack. Commit c44972f1 ("procfs: disable per-task stack usage on NOMMU") was applied to fix the NO_MMU case. Commit 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") was applied to fix a bug in ia32 executables being loaded. Commit 9ebd4eba7 ("procfs: fix /proc/<pid>/stat stack pointer for kernel threads") was applied to fix a bug which had kernel threads printing a userland stack address. Commit 1306d603f ('proc: partially revert "procfs: provide stack information for threads"') was then applied to revert the stack pages being used to solve a significant performance regression. This patch nearly undoes the effect of all these patches. The reason for reverting these is it provides an unusable value in field 28. For x86_64, a fork will result in the task->stack_start value being updated to the current user top of stack and not the stack start address. This unpredictability of the stack_start value makes it worthless. That includes the intended use of showing how much stack space a thread has. Other architectures will get different values. As an example, ia64 gets 0. The do_fork() and copy_process() functions appear to treat the stack_start and stack_size parameters as architecture specific. I only partially reverted c44972f1 ("procfs: disable per-task stack usage on NOMMU") . If I had completely reverted it, I would have had to change mm/Makefile only build pagewalk.o when CONFIG_PROC_PAGE_MONITOR is configured. Since I could not test the builds without significant effort, I decided to not change mm/Makefile. I only partially reverted 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") . I left the KSTK_ESP() change in place as that seemed worthwhile. Signed-off-by: Robin Holt <holt@sgi.com> Cc: Stefani Seibold <stefani@seibold.net> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-11input: remove obsolete {corgi,spitz,tosa}kbd.cEric Miao
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2010-05-11[ARM] pxa: remove now un-used corgi_ssp.c and corgi_lcd.cEric Miao
The only use of corgi_ssp.c is corgi_ts.c, which is now deprecated and removed. Remove corgi_ssp.c and corgi_lcd.c and their relevant function declarations and data structures. Signed-off-by: Eric Miao <eric.y.miao@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Pavel Machek <pavel@ucw.cz>
2010-05-11x86/amd-iommu: Add amd_iommu=off command line optionJoerg Roedel
This patch adds a command line option to tell the AMD IOMMU driver to not initialize any IOMMU it finds. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2010-05-10doc: inode uses a mutex instead of a semaphore.Thadeu Lima de Souza Cascardo
Replace the introduced i_sem by an i_mutex in the filesystem locking documentation. This was introduced [1] after all occurrences were already replaced in the same text [2]. However, the term "inode semaphore" has not been replaced then, and it's replaced now. [1] afddba49d18f346e5cc2938b6ed7c512db18ca68 [2] a7bc02f4f47fd0e7860c6589f0ad000d1476f7a3 Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-05-10PM QOS updateMark Gross
This patch changes the string based list management to a handle base implementation to help with the hot path use of pm-qos, it also renames much of the API to use "request" as opposed to "requirement" that was used in the initial implementation. I did this because request more accurately represents what it actually does. Also, I added a string based ABI for users wanting to use a string interface. So if the user writes 0xDDDDDDDD formatted hex it will be accepted by the interface. (someone asked me for it and I don't think it hurts anything.) This patch updates some documentation input I got from Randy. Signed-off-by: markgross <mgross@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2010-05-10PM / Hibernate: document open(/dev/snapshot) side effectsPavel Machek
Opening and closing /dev/snapshot causes the kernel to carry out some hibernate preparations that should be documented. [rjw: Added the changelog.] Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2010-05-10PM: Improve device power management documentAlan Stern
Improve the device power management document after it's been updated by the previous patch. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2010-05-10PM: Update device power management documentRafael J. Wysocki
The device PM document, Documentation/power/devices.txt, is badly outdated and requires total rework to fit the current design of the PM framework. Make it more up to date. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com>
2010-05-10rcu: improve the RCU CPU-stall warning documentationPaul E. McKenney
The existing Documentation/RCU/stallwarn.txt has proven unhelpful, so rework it a bit. In particular, show how to interpret the stall-warning messages. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2010-05-10rcu: reduce the number of spurious RCU_SOFTIRQ invocationsPaul E. McKenney
Lai Jiangshan noted that up to 10% of the RCU_SOFTIRQ are spurious, and traced this down to the fact that the current grace-period machinery will uselessly raise RCU_SOFTIRQ when a given CPU needs to go through a quiescent state, but has not yet done so. In this situation, there might well be nothing that RCU_SOFTIRQ can do, and the overhead can be worth worrying about in the ksoftirqd case. This patch therefore avoids raising RCU_SOFTIRQ in this situation. Changes since v1 (http://lkml.org/lkml/2010/3/30/122 from Lai Jiangshan): o Omit the rcu_qs_pending() prechecks, as they aren't that much less expensive than the quiescent-state checks. o Merge with the set_need_resched() patch that reduces IPIs. o Add the new n_rp_report_qs field to the rcu_pending tracing output. o Update the tracing documentation accordingly. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2010-05-10Merge branch 'master' of /repos/git/net-next-2.6Patrick McHardy
Conflicts: net/bridge/br_device.c net/bridge/br_forward.c Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-05-10Merge branch 'linus' into timers/coreThomas Gleixner
Reason: Further posix_cpu_timer patches depend on mainline changes Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2010-05-10fix "seperate" typos in commentsAnand Gadiyar
s/seperate/separate Signed-off-by: Anand Gadiyar <gadiyar@ti.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-05-10pcmcia: dev_node removal (core)Dominik Brodowski
Remove the dev_node declaration. We now only pass the device name to the deprecated userspace tools. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2010-05-10pcmcia: re-work pcmcia_request_irq()Dominik Brodowski
Instead of the old pcmcia_request_irq() interface, drivers may now choose between: - calling request_irq/free_irq directly. Use the IRQ from *p_dev->irq. - use pcmcia_request_irq(p_dev, handler_t); the PCMCIA core will clean up automatically on calls to pcmcia_disable_device() or device ejection. - drivers still not capable of IRQF_SHARED (or not telling us so) may use the deprecated pcmcia_request_exclusive_irq() for the time being; they might receive a shared IRQ nonetheless. CC: linux-bluetooth@vger.kernel.org CC: netdev@vger.kernel.org CC: linux-wireless@vger.kernel.org CC: linux-serial@vger.kernel.org CC: alsa-devel@alsa-project.org CC: linux-usb@vger.kernel.org CC: linux-ide@vger.kernel.org Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2010-05-10ALSA: Merge es1688 and es968 driversKrzysztof Helt
The ESS ES968 chip is nothing more then a PnP companion for a non-PnP audio chip. It was paired with non-PnP ESS' chips: ES688 and ES1688. The ESS' audio chips are handled by the es1688 driver in native mode. The PnP cards are handled by the ES968 driver in SB compatible mode. Move the ES968 chip handling to the es1688 driver so the driver can handle both PnP and non-PnP cards. The es968 is removed. Also, a new PnP id is added for the card I acquired (the change was tested on this card). Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2010-05-10nilfs2: change default of 'errors' mount option to 'remount-ro' modeRyusuke Konishi
Like ext3, nilfs has 'errors' mount option to allow specifying desired behavior on severe errors. Currently, the default action is 'errors=continue' and has potential to advance filesystem corruption for severe errors. This will change the action to 'errors=remount-ro' to avoid the issue. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2010-05-08Merge branch 'cpu_stop' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc into sched/core
2010-05-07Merge branch 'perf/urgent' into perf/coreIngo Molnar
Merge reason: Resolve patch dependency Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-05-07Merge commit 'v2.6.34-rc6' into sched/coreIngo Molnar
2010-05-06V4L/DVB: feature-removal: announce videotext.h removalHans Verkuil
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-05-06sched: replace migration_thread with cpu_stopTejun Heo
Currently migration_thread is serving three purposes - migration pusher, context to execute active_load_balance() and forced context switcher for expedited RCU synchronize_sched. All three roles are hardcoded into migration_thread() and determining which job is scheduled is slightly messy. This patch kills migration_thread and replaces all three uses with cpu_stop. The three different roles of migration_thread() are splitted into three separate cpu_stop callbacks - migration_cpu_stop(), active_load_balance_cpu_stop() and synchronize_sched_expedited_cpu_stop() - and each use case now simply asks cpu_stop to execute the callback as necessary. synchronize_sched_expedited() was implemented with private preallocated resources and custom multi-cpu queueing and waiting logic, both of which are provided by cpu_stop. synchronize_sched_expedited_count is made atomic and all other shared resources along with the mutex are dropped. synchronize_sched_expedited() also implemented a check to detect cases where not all the callback got executed on their assigned cpus and fall back to synchronize_sched(). If called with cpu hotplug blocked, cpu_stop already guarantees that and the condition cannot happen; otherwise, stop_machine() would break. However, this patch preserves the paranoid check using a cpumask to record on which cpus the stopper ran so that it can serve as a bisection point if something actually goes wrong theree. Because the internal execution state is no longer visible, rcu_expedited_torture_stats() is removed. This patch also renames cpu_stop threads to from "stopper/%d" to "migration/%d". The names of these threads ultimately don't matter and there's no reason to make unnecessary userland visible changes. With this patch applied, stop_machine() and sched now share the same resources. stop_machine() is faster without wasting any resources and sched migration users are much cleaner. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Dipankar Sarma <dipankar@in.ibm.com> Cc: Josh Triplett <josh@freedesktop.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Dimitri Sivanich <sivanich@sgi.com>
2010-05-06Merge branch 'master' into nextJames Morris
Conflicts: security/keys/keyring.c Resolved conflict with whitespace fix in find_keyring_by_name() Signed-off-by: James Morris <jmorris@namei.org>