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2010-07-28mutex: Don't spin when the owner CPU is offline or other weird casesBharat Nihalani
Due to recent load-balancer changes that delay the task migration to the next wakeup, the adaptive mutex spinning ends up in a live lock when the owner's CPU gets offlined because the cpu_online() check lives before the owner running check. This patch changes mutex_spin_on_owner() to return 0 (don't spin) in any case where we aren't sure about the owner struct validity or CPU number, and if the said CPU is offline. There is no point going back & re-evaluate spinning in corner cases like that, let's just go to sleep. Cherry-picked commit: 4b402210486c6414fe5fbfd85934a0a22da56b04 URL: http://android.git.kernel.org/?p=kernel/linux-2.6.git;a=summary Kernel version picked from: v2.6.34 Re-enable HAVE_DEFAULT_NO_SPIN_MUTEXES as root-cause of spin-lock is now fixed in sched.c For bug 713808 Change-Id: I06a7c85aa46be3cdd27da0a4e62ffa442a9805b4 Reviewed-on: http://git-master/r/4500 Tested-by: Bharat Nihalani <bnihalani@nvidia.com> Reviewed-by: Gary King <gking@nvidia.com>
2010-07-22[ARM] config: enable HAVE_DEFAULT_NO_SPIN_MUTEXESBharat Nihalani
There was a change introduced in K32 to optimally spin inside the mutex-lock implementation. This in-turn caused a regression and manifested as a soft-lockup in kernel while running mulit-media stress test. By enabling this config, we are disabling the newly introduced change. Bug 702462 Change-Id: I25720a4462a2c6a1b52a9682ba5cbc03a7bcca19 Reviewed-on: http://git-master/r/3718 Tested-by: Bharat Nihalani <bnihalani@nvidia.com> Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
2010-05-26[ARM/tegra] enable ARCH_HAS_CPUFREQ for tegraGary King
Change-Id: Id5a5124aa162f4ebf0436b3f369f094f0a54b09f
2010-05-20[arm] implement TLS register workaround for Tegra errata 657451Gary King
tegra 2 systems have a hardware errata which causes bit 20 of the TLS register (CP15 c13, operations 2-4) to be unreliable. in common user space threading libraries (glibc pthreads, bionic pthreads), the value stored in this register is guaranteed to be at least word-aligned, leaving bit 0 free. the work-around for this hardware errata is storing bit 20 of the user space-provided TLS value into bit 0 of the register inside __set_tls, and restoring it in the get_tls helper.
2010-05-14[ARM] smp_twd: add USE_ARM_TWD_PRESCALER configGary King
the local timers support prescaling the event timeout, which can be used to efficiently update the countdown frequency to compensate for CPU frequency changes. Change-Id: Ic4d0236f39fe1b8c6d436625bf9b584c417f6f00
2010-05-05[ARM] tegra: Add arch-specific udelay using TMRUSColin Cross
Change-Id: Ie59462e60b2f4c2f652a79d86fc106e915609600 Signed-off-by: Colin Cross <ccross@android.com>
2010-05-05[ARM] Add ARCH_PROVIDES_UDELAY config optionColin Cross
Change-Id: I93ded376b6b6eb4b16a9c5e1984e6753c0a8e0a1 Signed-off-by: Colin Cross <ccross@android.com>
2010-04-09ARM: enable CONFIG_CPU_IDLE supportGary King
add ARCH_HAS_CPU_IDLE_WAIT and ARCH_HAS_DEFAULT_IDLE configuration, and expose default_idle and cpu_idle_wait cpu_idle_wait implementation based on the implementation in the x86 tree Change-Id: Ie24b6336db833cc638868abfdba822889646d0a8 Reviewed-on: http://git-master/r/950 Reviewed-by: Gary King <gking@nvidia.com> Tested-by: Gary King <gking@nvidia.com>
2010-04-08[ARM] tegra: SMP supportGary King
Change-Id: I630e65a8779c428a26b5575bf9cb9eb0d81aa588 Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Erik Gilling <konkers@android.com> Conflicts: arch/arm/Kconfig
2010-04-08[ARM] tegra: Add clock supportColin Cross
v2: fixes from Russell King - include linux/io.h instead of asm/io.h - fix whitespace in Kconfig - Use spin_lock_init to initialize lock - Return -ENOSYS instead of BUG for unimplemented clock ops - Use proper return values in tegra2 clock ops Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Erik Gilling <konkers@android.com>
2010-04-08[ARM] tegra: initial tegra supportGary King
Change-Id: I70a48fdf4b3a9dead90cbb7fb914e4b52f0cdd40 v2: Fixes from Mike Rapoport - remove unused header files (mach/dma.h and mach/nand.h) - remove tegra 1 references from Makefile.boot v2: fixes from Russell King - remove mach/io.h include from mach/iomap.h - fix whitespace in Kconfig v2: from Colin Cross - fix invalid immediate in debug-macro.S Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: Erik Gilling <konkers@android.com> Conflicts: arch/arm/Kconfig arch/arm/mm/Kconfig
2010-04-05ARM: 5919/1: ARM: L2 : Errata 588369: Clean & Invalidate do not invalidate ↵Santosh Shilimkar
clean lines This patch implements the work-around for the errata 588369.The secure API is used to alter L2 debug register because of trust-zone. This version updated with comments from Russell and Catalin and generated against 2.6.33-rc6 mainline kernel. Detail comments can be found: http://www.spinics.net/lists/linux-omap/msg23431.html Signed-off-by: Woodruff Richard <r-woodruff2@ti.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-15ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3Linus Walleij
This adds the TCM interface to Linux, when active, it will detect and report TCM memories and sizes early in boot if present, introduce generic TCM memory handling, provide a generic TCM memory pool and select TCM memory for the U300 platform. See the Documentation/arm/tcm.txt for documentation. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-12Merge branch 'devel-stable' into develRussell King
Conflicts: MAINTAINERS arch/arm/mm/fault.c
2009-09-12Merge branches 'arm', 'at91', 'bcmring', 'ep93xx', 'mach-types', 'misc' and ↵Russell King
'w90x900' into devel
2009-09-12Merge branch 'nomadik' into devel-stableRussell King
2009-08-17ARM: implement highpteRussell King
Add the ARM implementation of highpte, which allows PTE tables to be placed in highmem. Unfortunately, we do not offer highpte support when support for L2 cache is enabled. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-17Merge branch 'next-s3c' of git://aeryn.fluff.org.uk/bjdooks/linux into ↵Russell King
devel-stable
2009-08-16ARM: S5PC100: Kconfigs and MakefilesByungho Min
S5PC100 is a new SoC with ARM coretex-A8 and numerous peripherals. This SoC is successor of S3C64XX. S5PC100 has peripherals which are still similar to S3C families so some drivers in "arch/arm/plat-s3c" can be shared. S5PC100 specific drivers will be added in "arch/arm/plat-s5pcxx" or "arch/arm/mach-s5pc100" Signed-off-by: Byungho Min <bhmin@samsung.com> [ben-linux@fluff.org: tidy and edit description] Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-08-15Merge branch 'for-rmk-2.6.32' of git://git.pengutronix.de/git/ukl/linux-2.6 ↵Russell King
into devel-stable
2009-08-15ARM: 5641/1: bcmring: add Kconfig and Makefile entries in arch/armLeo Chen
add bcmring option in Kconfig and add entry in Makefile in arch/arm directory Signed-off-by: Leo Chen <leochen@broadcom.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-15ARM: 5676/1: Provide more useful introduction for w90x900wanzongshun
Provide more useful introduction for w90x900 Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-15ARM: 5674/1: Add clocksource/clockevent support for w90p910 platformwanzongshun
Add clocksource/clockevent support for w90p910 platform. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-08-13[ARM] let arch/arm/Kconfig source drivers/KconfigUwe Kleine-König
The changes introduced by this change are: - drivers/mtd/Kconfig doesn't depend on ALIGNMENT_TRAP || !CPU_CP15_MMU any more - the following files are sourced additionally: + drivers/macintosh/Kconfig completely depends on PPC || MAC || X86 + drivers/telephony/Kconfig new + drivers/pps/Kconfig new + drivers/infiniband/Kconfig new + drivers/edac/Kconfig depends on X86 || PPC + drivers/vlynq/Kconfig depends on AR7 && EXPERIMENTAL (that is ARCH_MIPS) + drivers/xen/Kconfig everything depends on XEN + drivers/platform/Kconfig depends on X86 - drivers/regulator/Kconfig is sourced later as is drivers/accessibility/Kconfig Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
2009-08-13Use kernel/Kconfig.preempt for ARMUwe Kleine-König
before this patch ARM had it's own definition of CONFIG_PREEMPT. Instead of that use the general definition provided in kernel/Kconfig.preempt. This patch changes the available options in *config. Namely PREEMPT isn't a stand alone bool anymore, but part of a 'choice' the following Kconfig symbols are added: PREEMPT_NONE PREEMPT_VOLUNTARY Selecting PREEMPT_NONE now produces exactly the code as not selecting PREEMPT before (apart from a comment in /sys/kernel/debug/tracing/(per_cpu/cpuX/)?trace). The only difference PREEMPT_VOLUNTARY does is that might_resched might reschedule. Both should't introduce regressions. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <linux@arm.linux.org.uk>
2009-07-30ARM: S3C: CPUFREQ: Add debugfs support for cpufreqBen Dooks
Add debugfs support for the cpufreq driver to allow information about the system state to be exported to the user. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-07-30ARM: Add S3C24XX to CPUFreq KConfigBen Dooks
Add the S3C24XX to the main ARM CPUFreq Kconfig support list. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-07-30ARM: Add ARCH_HAS_CPUFREQ for presence of CPUFREQ driverBen Dooks
Add ARCH_HAS_CPUFREQ so that each machine config can select it if they have CPUFREQ driver support. This means that the CPUFREQ specific area does not need the if statement updating each time a new machine is added. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-07-24nommu: Enables to select noMMU modeHyok S. Choi
MMU option is now selectable. Signed-off-by: Hyok S. Choi <hyok.choi@samsung.com>
2009-07-24Thumb-2: Add Thumb-2 support to the build filesCatalin Marinas
This patch adds the necessary entries to the Makefile and Kconfig files for building the Thumb-2 kernel. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-07-24Thumb-2: Add macros for the unified assembler syntaxCatalin Marinas
This patch adds various C and assembler macros that help with using the unified assembler syntax for compiling files to either ARM or Thumb-2 modes. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2009-07-17[ARM] 5601/1: Add HAVE_CLK depends on for w90p910 platformwanzongshun
Add HAVE_CLK depends on for w90p910 platform. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-07-06[ARM] realview: add PL061 gpiolib supportRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-07-06[ARM] versatile: add PL061 gpiolib supportRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-07-02[ARM] 5584/1: nomadik: add gpio driver and devicesAlessandro Rubini
Signed-off-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-07-02[ARM] 5590/1: Add basic support for ST Nomadik 8815 SoC and evaluation boardAlessandro Rubini
This patch adds the basic infrastructure for the Nomadik 8815 CPU and the "Nomadik Hardware Kit" NHK8815. This patch only includes the serial console and core stuff, no drivers. Signed-off-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-06-16[ARM] S3C64XX: Initial support for DVFSMark Brown
This patch provides initial support for CPU frequency scaling on the Samsung S3C ARM processors. Currently only S3C6410 processors are supported, though addition of another data table with supported clock rates should be sufficient to enable support for further CPUs. Use the regulator framework to provide optional support for DVFS in the S3C cpufreq driver. When a software controllable regulator is configured the driver will use it to lower the supply voltage when running at a lower frequency, giving improved power savings. When regulator support is disabled or no regulator can be obtained for VDDARM the driver will fall back to scaling only the frequency. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-06-14Merge branch 'u300' into develRussell King
Conflicts: arch/arm/Makefile Updates: arch/arm/mach-u300/core.c arch/arm/mach-u300/timer.c
2009-06-14Merge branch 'stmp' into develRussell King
2009-06-14Merge branch 'copy_user' of git://git.marvell.com/orion into develRussell King
2009-06-11Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6 into develRussell King
Conflicts: arch/arm/Kconfig arch/arm/kernel/smp.c arch/arm/mach-realview/Makefile arch/arm/mach-realview/platsmp.c
2009-06-11Merge branch 'w90x900' into develRussell King
2009-06-11[ARM] 5549/1: Add clock api for w90p910 platform.wanzongshun
Add clock api for w90p910 platform. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-06-11[ARM] 5548/1: Add gpio api for w90p910 platformwanzongshun
Add gpio api for w90p910 platform. Signed-off-by: Wan ZongShun <mcuos.com@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-06-10Merge branch 'for_rmk' of ↵Russell King
git://dev.omapzoom.org/pub/scm/santosh/kernel-omap4-base into devel
2009-06-09ARM: OMAP4: SMP: Enable SMP support for OMAP4430Santosh Shilimkar
This patch enables SMP on OMAP4430 SDP platform. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2009-06-08Merge branch 'for-rmk' of git://git.marvell.com/orion into develRussell King
2009-06-08[ARM] orion: convert gpio to use gpiolibErik Benada
Signed-off-by: Erik Benada <erikbenada@yahoo.ca> [ nico: fix locking, additional cleanups ] Signed-off-by: Nicolas Pitre <nico@marvell.com>
2009-06-01Merge branch 'smp' into develRussell King
2009-05-31[ARM] Kconfig: remove 'default n'Russell King
Kconfig entries default to n, so there's no need for this to be explicitly specified. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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