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* Input: ad7877, ad7879 - remove depreciated IRQF_SAMPLE_RANDOM flagMichael Hennerich2009-04-15
| | | | | | | | This patch removes depreciated IRQF_SAMPLE_RANDOM flags from ad7877 and ad7879 touchscreen drivers. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: da9034-ts - make pen {down,up} events more reliableEric Miao2009-04-15
| | | | | | | | | | | PEN_{UP/DOWN} events are expected to be available soon after stopping TSI auto measurement, but this is found not always be true. Work around this by adding delay and simulating such an event (according to pen down status bit). Signed-off-by: Bin Yang <bin.yang@marvell.com> Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: da9034-ts - add Bin Yang as co-author of the driverEric Miao2009-04-15
| | | | | | | | | Bin did a lot of work on this driver, without his help, this driver will not be possible. Signed-off-by: Bin Yang <bin.yang@marvell.com> Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: atkbd - add forced release keys quirk for Samsung NC20Barry Carroll2009-04-15
| | | | | Signed-off-by: Barry Carroll <baz8080@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: atkbd - add forced release keys quirk for Samsung Q45Dmitry Torokhov2009-04-15
| | | | Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: gameport - fix attach driver codeDmitry Torokhov2009-04-15
| | | | | | | | | The commit 6902c0bead4ce266226fc0c5b3828b850bdc884a that moved driver registration out of kgameportd thread was incomplete and did not add the code necessary to actually attach driver to already registered devices, rectify that. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: hp_sdc_rtc should depend on serioAlexander Beregalov2009-04-15
| | | | | | | | | | | | Fix this build error when CONFIG_SERIO is not set hp_sdc_rtc.c:691: undefined reference to `hp_sdc_request_timer_irq' and so on.. "select should be used with care. select will force a symbol to a value without visiting the dependencies." Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: wm97xx - don't specify IRQF_SAMPLE_RANDOMMark Brown2009-04-11
| | | | | | | | The input core will add entropy to the pool so this flag is not needed. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: ads7846 - introduce platform specific way to synchronize samplingEric Miao2009-04-11
| | | | | | | | | Noises can be introduced when LCD signals are being driven, some platforms provide a signal to assist the synchronization of this sampling procedure. Signed-off-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: remove unnecessary synchronize_rcu() callArjan van de Ven2009-04-11
| | | | | | | | | There is no need to issue serialize_rcu() after adding a new handle to the list of handles associated with the device because new events will "see" the new handle in the list immediately. Remove it so we can boot a little bit faster. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: i8042 - add a DMI table for the i8042.reset optionArjan van de Ven2009-04-11
| | | | | | | | | | | | There are several DMI tables in the i8042 (keyboard) driver already, but not one for the i8042.reset option. This patch adds such an option. Two users for this table are added as well, the MSI Wind U-100 and the LG X110. The MSI Wind also needs to be in the "don't trust the pnp data" for the touchpad to work on my machine. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: i8042 - introduce a tougher resetArjan van de Ven2009-04-11
| | | | | | | | | | | | | Some touchpads don't reset right the first time (MSI Wind U-100 for example). This patch will retry the reset up to 5 times. In addition, on x86, we don't fail entire i8042 initialization if controller reset fails in hope that keyboard port will still be functional and user will still get a working keyboard. This is especially important on netbooks. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: i8042 - add HP DV9700 to the noloop listDmitry Torokhov2009-04-08
| | | | | Reported-by: Kenneth Crudup <kenny@panix.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: arrange drivers/input/misc/Makefile in alphabetical orderDmitry Torokhov2009-03-09
| | | | | | | | Everyone adds their driver to the end of the list, hopefully if it is in alphabetical order new drivers will spread out a bit and I can merge them more easily. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: add AD7879 Touchscreen driverMichael Hennerich2009-03-09
| | | | | | | | | | [randy.dunlap@oracle.com: don't use bus_id] [dtor@mail.ru: locking and other fixups] Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: add AD7877 touchscreen driverMichael Hennerich2009-03-09
| | | | | | | | [dtor@mail.ru: locking and other fixups] Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: bf54x-keys - fix typo in warningMichael Hennerich2009-03-09
| | | | | | Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: add driver for S1 button of rb532Phil Sutter2009-03-09
| | | | | | | | | | | | | | | | | | | Mikrotik's Routerboard 532 has two builtin buttons, from which one triggers a hardware reset. The other one is accessible through GPIO pin 1. Sadly, this pin is being multiplexed with UART0 input, so enabling it as interrupt source (as implied by the gpio-keys driver) is not possible unless UART0 has been turned off. The later one though is a rather bad idea as the Routerboard is an embedded device with only a single serial port, so it's almost always used as serial console device. This patch adds a driver based on INPUT_POLLDEV, which disables the UART and reconfigures GPIO pin 1 temporarily while reading the button state. This procedure works fine and has been tested as part of another, unpublished driver for this device. Signed-off-by: Phil Sutter <n0-1@freewrt.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: generic driver for rotary encoders on GPIOsDaniel Mack2009-03-08
| | | | | | | | | | | This patch adds a generic driver for rotary encoders connected to GPIO pins of a system. It relies on gpiolib and generic hardware irqs. The documentation that also comes with this patch explains the concept and how to use the driver. Signed-off-by: Daniel Mack <daniel@caiaq.de> Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: hilkbd - fix crash when removing hilkbd moduleHelge Deller2009-03-08
| | | | | | | | | | | | | | | | | | On parisc machines, which don't have HIL, removing the hilkbd module panics the kernel. Fix this by adding proper implementations for the probe and remove functions to the parisc_driver structure. A few functions were renamed to clean up the code and make it easier readable. Disable the MODULE_DEVICE_TABLE() macro on parisc since the kernel module autoloader should instead prefer the hp_sdc driver which takes care of full HIL support, including HIL mouse and HIL tablets. [dtor@mail.ru: fix some section markups] Signed-off-by: Helge Deller <deller@gmx.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: atkbd - add quirk for Fujitsu Siemens Amilo PA 1510Daniel Mierswa2009-03-08
| | | | | | | | | The volume up and down keys on the Fujitsu Siemens Amilo PA 1510 laptop won't generate release events, so we have to do that. Use the same way that is already used with other models. Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: atkbd - consolidate force release quirk setupDaniel Mierswa2009-03-08
| | | | | Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: add accelerated touchscreen support for Marvell ZyloniteMark Brown2009-03-08
| | | | | | | | | This patch implements accelerated touchscreen support for the Marvell Zylonite development platform, supporting pen down interrupts and continuous mode data transfers. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: ucb1400_ts, mainstone-wm97xx - add BTN_TOUCH eventsMike Rapoport2009-03-08
| | | | | | | | | | | Add BTN_TOUCH event reporting to ucb1400_ts and accelerated mainstone-wm97xx touchscreen drivers. Together with previously posted similar patch for wm97xx-core this will make all touchscreen drivers behave consistently wrt. BTN_TOUCH. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: wm97xx - use disable_irq_nosync() for MainstoneMark Brown2009-03-08
| | | | | | | | This should make no practical difference since the Mainstone can't be SMP but it is more correct. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: wm97xx - add BTN_TOUCH event to wm97xx to use it with AndroidMike Rapoport2009-03-08
| | | | | | | | | | Android expects BTN_TOUCH events when pen state changes. Add BTN_TOUCH event reporting to allow use of wm97xx touchscreen controller wiht Android devices. Signed-off-by: Mike Rapoport <mike@compulab.co.il> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Input: fix polling of /proc/bus/input/devicesDmitry Torokhov2009-03-08
| | | | | Tested-by: Alessio Sangalli <alesan@manoweb.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* Merge commit 'v2.6.29-rc7' into nextDmitry Torokhov2009-03-08
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| * Linux 2.6.29-rc7Linus Torvalds2009-03-03
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| * Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds2009-03-03
| |\ | | | | | | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: ixp4xx - Fix qmgr_request_queue build failure crypto: api - Fix module load deadlock with fallback algorithms
| | * crypto: ixp4xx - Fix qmgr_request_queue build failureKrzysztof Hałasa2009-03-03
| | | | | | | | | | | | | | | | | | | | | There is another user of IXP4xx queue manager, fix it. Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| | * crypto: api - Fix module load deadlock with fallback algorithmsHerbert Xu2009-02-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the mandatory algorithm testing at registration, we have now created a deadlock with algorithms requiring fallbacks. This can happen if the module containing the algorithm requiring fallback is loaded first, without the fallback module being loaded first. The system will then try to test the new algorithm, find that it needs to load a fallback, and then try to load that. As both algorithms share the same module alias, it can attempt to load the original algorithm again and block indefinitely. As algorithms requiring fallbacks are a special case, we can fix this by giving them a different module alias than the rest. Then it's just a matter of using the right aliases according to what algorithms we're trying to find. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| * | Merge branch 'sched-fixes-for-linus' of ↵Linus Torvalds2009-03-03
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: don't allow setuid to succeed if the user does not have rt bandwidth sched_rt: don't start timer when rt bandwidth disabled
| | * | sched: don't allow setuid to succeed if the user does not have rt bandwidthDhaval Giani2009-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: fix hung task with certain (non-default) rt-limit settings Corey Hickey reported that on using setuid to change the uid of a rt process, the process would be unkillable and not be running. This is because there was no rt runtime for that user group. Add in a check to see if a user can attach an rt task to its task group. On failure, return EINVAL, which is also returned in CONFIG_CGROUP_SCHED. Reported-by: Corey Hickey <bugfood-ml@fatooh.org> Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | sched_rt: don't start timer when rt bandwidth disabledHiroshi Shimamoto2009-02-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: fix incorrect condition check No need to start rt bandwidth timer when rt bandwidth is disabled. If this timer starts, it may stop at sched_rt_period_timer() on the first time. Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | Merge branch 'x86-fixes-for-linus' of ↵Linus Torvalds2009-03-03
| |\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86: oprofile: don't set counter width from cpuid on Core2 x86: fix init_memory_mapping() to handle small ranges
| | * | | x86: oprofile: don't set counter width from cpuid on Core2Tim Blechmann2009-03-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: fix stuck NMIs and non-working oprofile on certain CPUs Resetting the counter width of the performance counters on Intel's Core2 CPUs, breaks the delivery of NMIs, when running in x86_64 mode. This should fix bug #12395: http://bugzilla.kernel.org/show_bug.cgi?id=12395 Signed-off-by: Tim Blechmann <tim@klingt.org> Signed-off-by: Robert Richter <robert.richter@amd.com> LKML-Reference: <20090303100412.GC10085@erda.amd.com> Cc: <stable@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | x86: fix init_memory_mapping() to handle small rangesYinghai Lu2009-03-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: fix failed EFI bootup in certain circumstances Ying Huang found init_memory_mapping() has problem with small ranges less than 2M when he tried to direct map the EFI runtime code out of max_low_pfn_mapped. It turns out we never considered that case and didn't check the range... Reported-by: Ying Huang <ying.huang@intel.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Brian Maly <bmaly@redhat.com> LKML-Reference: <49ACDDED.1060508@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | Merge branch 'tracing/mmiotrace' of ↵Linus Torvalds2009-03-03
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'tracing/mmiotrace' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86 mmiotrace: fix race with release_kmmio_fault_page() x86 mmiotrace: improve handling of secondary faults x86 mmiotrace: split set_page_presence() x86 mmiotrace: fix save/restore page table state x86 mmiotrace: WARN_ONCE if dis/arming a page fails x86: add far read test to testmmiotrace x86: count errors in testmmiotrace.ko
| | * | | | x86 mmiotrace: fix race with release_kmmio_fault_page()Pekka Paalanen2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There was a theoretical possibility to a race between arming a page in post_kmmio_handler() and disarming the page in release_kmmio_fault_page(): cpu0 cpu1 ------------------------------------------------------------------ mmiotrace shutdown enter release_kmmio_fault_page fault on the page disarm the page disarm the page handle the MMIO access re-arm the page put the page on release list remove_kmmio_fault_pages() fault on the page page not known to mmiotrace fall back to do_page_fault() *KABOOM* (This scenario also shows the double disarm case which is allowed.) Fixed by acquiring kmmio_lock in post_kmmio_handler() and checking if the page is being released from mmiotrace. Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Stuart Bennett <stuart@freedesktop.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86 mmiotrace: improve handling of secondary faultsStuart Bennett2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upgrade some kmmio.c debug messages to warnings. Allow secondary faults on probed pages to fall through, and only log secondary faults that are not due to non-present pages. Patch edited by Pekka Paalanen. Signed-off-by: Stuart Bennett <stuart@freedesktop.org> Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86 mmiotrace: split set_page_presence()Pekka Paalanen2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | From 36772dcb6ffbbb68254cbfc379a103acd2fbfefc Mon Sep 17 00:00:00 2001 From: Pekka Paalanen <pq@iki.fi> Date: Sat, 28 Feb 2009 21:34:59 +0200 Split set_page_presence() in kmmio.c into two more functions set_pmd_presence() and set_pte_presence(). Purely code reorganization, no functional changes. Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Stuart Bennett <stuart@freedesktop.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86 mmiotrace: fix save/restore page table statePekka Paalanen2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | From baa99e2b32449ec7bf147c234adfa444caecac8a Mon Sep 17 00:00:00 2001 From: Pekka Paalanen <pq@iki.fi> Date: Sun, 22 Feb 2009 20:02:43 +0200 Blindly setting _PAGE_PRESENT in disarm_kmmio_fault_page() overlooks the possibility, that the page was not present when it was armed. Make arm_kmmio_fault_page() store the previous page presence in struct kmmio_fault_page and use it on disarm. This patch was originally written by Stuart Bennett, but Pekka Paalanen rewrote it a little different. Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Stuart Bennett <stuart@freedesktop.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86 mmiotrace: WARN_ONCE if dis/arming a page failsStuart Bennett2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Print a full warning once, if arming or disarming a page fails. Also, if initial arming fails, do not handle the page further. This avoids the possibility of a page failing to arm and then later claiming to have handled any fault on that page. WARN_ONCE added by Pekka Paalanen. Signed-off-by: Stuart Bennett <stuart@freedesktop.org> Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86: add far read test to testmmiotracePekka Paalanen2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Apparently pages far into an ioremapped region might not actually be mapped during ioremap(). Add an optional read test to try to trigger a multiply faulting MMIO access. Also add more messages to the kernel log to help debugging. This patch is based on a patch suggested by Stuart Bennett <stuart@freedesktop.org> who discovered bugs in mmiotrace related to normal kernel space faults. Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Stuart Bennett <stuart@freedesktop.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| | * | | | x86: count errors in testmmiotrace.koPekka Paalanen2009-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Check the read values against the written values in the MMIO read/write test. This test shows if the given MMIO test area really works as memory, which is a prerequisite for a successful mmiotrace test. Signed-off-by: Pekka Paalanen <pq@iki.fi> Cc: Stuart Bennett <stuart@freedesktop.org> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | | Merge branch 'core-fixes-for-linus' of ↵Linus Torvalds2009-03-03
| |\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rcu: Teach RCU that idle task is not quiscent state at boot
| | * | | | | rcu: Teach RCU that idle task is not quiscent state at bootPaul E. McKenney2009-02-25
| | | |_|/ / | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch fixes a bug located by Vegard Nossum with the aid of kmemcheck, updated based on review comments from Nick Piggin, Ingo Molnar, and Andrew Morton. And cleans up the variable-name and function-name language. ;-) The boot CPU runs in the context of its idle thread during boot-up. During this time, idle_cpu(0) will always return nonzero, which will fool Classic and Hierarchical RCU into deciding that a large chunk of the boot-up sequence is a big long quiescent state. This in turn causes RCU to prematurely end grace periods during this time. This patch changes the rcutree.c and rcuclassic.c rcu_check_callbacks() function to ignore the idle task as a quiescent state until the system has started up the scheduler in rest_init(), introducing a new non-API function rcu_idle_now_means_idle() to inform RCU of this transition. RCU maintains an internal rcu_idle_cpu_truthful variable to track this state, which is then used by rcu_check_callback() to determine if it should believe idle_cpu(). Because this patch has the effect of disallowing RCU grace periods during long stretches of the boot-up sequence, this patch also introduces Josh Triplett's UP-only optimization that makes synchronize_rcu() be a no-op if num_online_cpus() returns 1. This allows boot-time code that calls synchronize_rcu() to proceed normally. Note, however, that RCU callbacks registered by call_rcu() will likely queue up until later in the boot sequence. Although rcuclassic and rcutree can also use this same optimization after boot completes, rcupreempt must restrict its use of this optimization to the portion of the boot sequence before the scheduler starts up, given that an rcupreempt RCU read-side critical section may be preeempted. In addition, this patch takes Nick Piggin's suggestion to make the system_state global variable be __read_mostly. Changes since v4: o Changes the name of the introduced function and variable to be less emotional. ;-) Changes since v3: o WARN_ON(nr_context_switches() > 0) to verify that RCU switches out of boot-time mode before the first context switch, as suggested by Nick Piggin. Changes since v2: o Created rcu_blocking_is_gp() internal-to-RCU API that determines whether a call to synchronize_rcu() is itself a grace period. o The definition of rcu_blocking_is_gp() for rcuclassic and rcutree checks to see if but a single CPU is online. o The definition of rcu_blocking_is_gp() for rcupreempt checks to see both if but a single CPU is online and if the system is still in early boot. This allows rcupreempt to again work correctly if running on a single CPU after booting is complete. o Added check to rcupreempt's synchronize_sched() for there being but one online CPU. Tested all three variants both SMP and !SMP, booted fine, passed a short rcutorture test on both x86 and Power. Located-by: Vegard Nossum <vegard.nossum@gmail.com> Tested-by: Vegard Nossum <vegard.nossum@gmail.com> Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
| * | | | | Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2009-03-03
| |\ \ \ \ \ | | |_|_|/ / | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * master.kernel.org:/home/rmk/linux-2.6-arm: [ARM] fix lots of ARM __devexit sillyness [ARM] 5417/1: Set the correct cacheid for ARMv6 CPUs with ARMv7 style MMU [ARM] 5416/1: Use unused address in v6_early_abort [ARM] 5411/1: S3C64XX: Fix EINT unmask [ARM] at91: fix for Atmel AT91 powersaving [ARM] RiscPC: Fix etherh oops
| | * | | | [ARM] fix lots of ARM __devexit sillynessRussell King2009-03-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | `iop_adma_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o `mv_xor_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o `mv64xxx_i2c_unmap_regs' referenced in section `.devinit.text' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o `mv64xxx_i2c_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o `orion_nand_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o `pxafb_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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