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2008-07-25kprobes: improve kretprobe scalability with hashed lockingSrinivasa D S
Currently list of kretprobe instances are stored in kretprobe object (as used_instances,free_instances) and in kretprobe hash table. We have one global kretprobe lock to serialise the access to these lists. This causes only one kretprobe handler to execute at a time. Hence affects system performance, particularly on SMP systems and when return probe is set on lot of functions (like on all systemcalls). Solution proposed here gives fine-grain locks that performs better on SMP system compared to present kretprobe implementation. Solution: 1) Instead of having one global lock to protect kretprobe instances present in kretprobe object and kretprobe hash table. We will have two locks, one lock for protecting kretprobe hash table and another lock for kretporbe object. 2) We hold lock present in kretprobe object while we modify kretprobe instance in kretprobe object and we hold per-hash-list lock while modifying kretprobe instances present in that hash list. To prevent deadlock, we never grab a per-hash-list lock while holding a kretprobe lock. 3) We can remove used_instances from struct kretprobe, as we can track used instances of kretprobe instances using kretprobe hash table. Time duration for kernel compilation ("make -j 8") on a 8-way ppc64 system with return probes set on all systemcalls looks like this. cacheline non-cacheline Un-patched kernel aligned patch aligned patch =============================================================================== real 9m46.784s 9m54.412s 10m2.450s user 40m5.715s 40m7.142s 40m4.273s sys 2m57.754s 2m58.583s 3m17.430s =========================================================== Time duration for kernel compilation ("make -j 8) on the same system, when kernel is not probed. ========================= real 9m26.389s user 40m8.775s sys 2m7.283s ========================= Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com> Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-24Merge branch 'timers-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: nohz: adjust tick_nohz_stop_sched_tick() call of s390 as well nohz: prevent tick stop outside of the idle loop
2008-07-24PAGE_ALIGN(): correctly handle 64-bit values on 32-bit architecturesAndrea Righi
On 32-bit architectures PAGE_ALIGN() truncates 64-bit values to the 32-bit boundary. For example: u64 val = PAGE_ALIGN(size); always returns a value < 4GB even if size is greater than 4GB. The problem resides in PAGE_MASK definition (from include/asm-x86/page.h for example): #define PAGE_SHIFT 12 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) #define PAGE_MASK (~(PAGE_SIZE-1)) ... #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK) The "~" is performed on a 32-bit value, so everything in "and" with PAGE_MASK greater than 4GB will be truncated to the 32-bit boundary. Using the ALIGN() macro seems to be the right way, because it uses typeof(addr) for the mask. Also move the PAGE_ALIGN() definitions out of include/asm-*/page.h in include/linux/mm.h. See also lkml discussion: http://lkml.org/lkml/2008/6/11/237 [akpm@linux-foundation.org: fix drivers/media/video/uvc/uvc_queue.c] [akpm@linux-foundation.org: fix v850] [akpm@linux-foundation.org: fix powerpc] [akpm@linux-foundation.org: fix arm] [akpm@linux-foundation.org: fix mips] [akpm@linux-foundation.org: fix drivers/media/video/pvrusb2/pvrusb2-dvb.c] [akpm@linux-foundation.org: fix drivers/mtd/maps/uclinux.c] [akpm@linux-foundation.org: fix powerpc] Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-23kgdb: support for ARCH=armJason Wessel
This patch adds the ARCH=arm specific a kgdb backend, originally written by Deepak Saxena <dsaxena@plexity.net> and George Davis <gdavis@mvista.com>. Geoff Levand <geoffrey.levand@am.sony.com>, Nicolas Pitre, Manish Lachwani, and Jason Wessel have contributed various fixups here as well. The KGDB patch makes one change to the core ARM architecture such that the traps are initialized early for use with the debugger or other subsystems. [ mingo@elte.hu: small cleanups. ] [ ben-linux@fluff.org: fixed early_trap_init ] Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Acked-by: Deepak Saxena <dsaxena@plexity.net>
2008-07-21arm: bus_id -> dev_name() and dev_set_name() conversionsKay Sievers
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-21sysdev: Pass the attribute to the low level sysdev show/store functionAndi Kleen
This allow to dynamically generate attributes and share show/store functions between attributes. Right now most attributes are generated by special macros and lots of duplicated code. With the attribute passed it's instead possible to attach some data to the attribute and then use that in shared low level functions to do different things. I need this for the dynamically generated bank attributes in the x86 machine check code, but it'll allow some further cleanups. I converted all users in tree to the new show/store prototype. It's a single huge patch to avoid unbisectable sections. Runtime tested: x86-32, x86-64 Compiled only: ia64, powerpc Not compile tested/only grep converted: sh, arm, avr32 Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-21driver core: fix a lot of printk usages of bus_idGreg Kroah-Hartman
We have the dev_printk() variants for this kind of thing, use them instead of directly trying to access the bus_id field of struct device. This is done in order to remove bus_id entirely. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-07-18Merge branch 'linus' into timers/nohzIngo Molnar
2008-07-18nohz: prevent tick stop outside of the idle loopThomas Gleixner
Jack Ren and Eric Miao tracked down the following long standing problem in the NOHZ code: scheduler switch to idle task enable interrupts Window starts here ----> interrupt happens (does not set NEED_RESCHED) irq_exit() stops the tick ----> interrupt happens (does set NEED_RESCHED) return from schedule() cpu_idle(): preempt_disable(); Window ends here The interrupts can happen at any point inside the race window. The first interrupt stops the tick, the second one causes the scheduler to rerun and switch away from idle again and we end up with the tick disabled. The fact that it needs two interrupts where the first one does not set NEED_RESCHED and the second one does made the bug obscure and extremly hard to reproduce and analyse. Kudos to Jack and Eric. Solution: Limit the NOHZ functionality to the idle loop to make sure that we can not run into such a situation ever again. cpu_idle() { preempt_disable(); while(1) { tick_nohz_stop_sched_tick(1); <- tell NOHZ code that we are in the idle loop while (!need_resched()) halt(); tick_nohz_restart_sched_tick(); <- disables NOHZ mode preempt_enable_no_resched(); schedule(); preempt_disable(); } } In hindsight we should have done this forever, but ... /me grabs a large brown paperbag. Debugged-by: Jack Ren <jack.ren@marvell.com>, Debugged-by: eric miao <eric.y.miao@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-07-15Merge branch 'generic-ipi' into generic-ipi-for-linusIngo Molnar
Conflicts: arch/powerpc/Kconfig arch/s390/kernel/time.c arch/x86/kernel/apic_32.c arch/x86/kernel/cpu/perfctr-watchdog.c arch/x86/kernel/i8259_64.c arch/x86/kernel/ldt.c arch/x86/kernel/nmi_64.c arch/x86/kernel/smpboot.c arch/x86/xen/smp.c include/asm-x86/hw_irq_32.h include/asm-x86/hw_irq_64.h include/asm-x86/mach-default/irq_vectors.h include/asm-x86/mach-voyager/irq_vectors.h include/asm-x86/smp.h kernel/Makefile Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-07-15Merge branch 'core/stacktrace' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core/stacktrace' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: generic-ipi: powerpc/generic-ipi tree build failure stacktrace: fix build failure on sparc64 stacktrace: export save_stack_trace[_tsk] stacktrace: fix modular build, export print_stack_trace and save_stack_trace backtrace: replace timer with tasklet + completions stacktrace: add saved stack traces to backtrace self-test stacktrace: print_stack_trace() cleanup debugging: make stacktrace independent from DEBUG_KERNEL stacktrace: don't crash on invalid stack trace structs
2008-07-14Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (241 commits) [ARM] 5171/1: ep93xx: fix compilation of modules using clocks [ARM] 5133/2: at91sam9g20 defconfig file [ARM] 5130/4: Support for the at91sam9g20 [ARM] 5160/1: IOP3XX: gpio/gpiolib support [ARM] at91: Fix NAND FLASH timings for at91sam9x evaluation kits. [ARM] 5084/1: zylonite: Register AC97 device [ARM] 5085/2: PXA: Move AC97 over to the new central device declaration model [ARM] 5120/1: pxa: correct platform driver names for PXA25x and PXA27x UDC drivers [ARM] 5147/1: pxaficp_ir: drop pxa_gpio_mode calls, as pin setting [ARM] 5145/1: PXA2xx: provide api to control IrDA pins state [ARM] 5144/1: pxaficp_ir: cleanup includes [ARM] pxa: remove pxa_set_cken() [ARM] pxa: allow clk aliases [ARM] Feroceon: don't disable BPU on boot [ARM] Orion: LED support for HP mv2120 [ARM] Orion: add RD88F5181L-FXO support [ARM] Orion: add RD88F5181L-GE support [ARM] Orion: add Netgear WNR854T support [ARM] s3c2410_defconfig: update for current build [ARM] Acer n30: Minor style and indentation fixes. ...
2008-07-10Merge branches 'at91', 'dyntick', 'ep93xx', 'iop', 'ixp', 'misc', 'orion', ↵Russell King
'omap-reviewed', 'rpc', 'rtc' and 's3c' into devel
2008-07-03[ARM] rpc: ecard: remove deprecated ecard_address() and relativesRussell King
ecard_address() is obsolete, and has been marked deprecated since at least 2.6.12-rc2. All in-tree users have been updated to use the new approach, so it's time to remove this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-07-03stacktrace: export save_stack_trace[_tsk]Ingo Molnar
Andrew Morton reported this against linux-next: ERROR: ".save_stack_trace" [tests/backtracetest.ko] undefined! Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-26on_each_cpu(): kill unused 'retry' parameterJens Axboe
It's not even passed on to smp_call_function() anymore, since that was removed. So kill it. Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-06-26arm: convert to generic helpers for IPI function callsJens Axboe
This converts arm to use the new helpers for smp_call_function() and friends, and adds support for smp_call_function_single(). Fixups and testing done by Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-06-23ftrace: store mcount address in rec->ipAbhishek Sagar
Record the address of the mcount call-site. Currently all archs except sparc64 record the address of the instruction following the mcount call-site. Some general cleanups are entailed. Storing mcount addresses in rec->ip enables looking them up in the kprobe hash table later on to check if they're kprobe'd. Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Cc: davem@davemloft.net Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-22[ARM] latencytop supportNicolas Pitre
Available for !SMP only at the moment. From Russell: |Basically, if a thread is running on a CPU, thread_saved_fp() is invalid. |So, the question is: what guarantees do we have here that 'tsk' is not |running on another CPU? Signed-off-by: Nicolas Pitre <nico@marvell.com> Tested-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
2008-06-10ftrace: remove ftrace_ip_converted()Abhishek Sagar
Remove the unneeded function ftrace_ip_converted(). Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-02ftrace: export kretprobe_trampoline for function tracerAbhishek Sagar
Follow suit from kprobe implementations on other archs and make kretprobe_trampoline non-static. Ftrace implmentation (more specifically, kernel/trace/trace.c) requires access to it (see-> http://kerneltrap.org/mailarchive/linux-kernel/2008/5/27/1955234). Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-06-02ftrace: core support for ARMAbhishek Sagar
Core ftrace support for the ARM architecture, which includes support for dynamic function tracing. Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-05-30clean up atags exporting codeUwe Kleine-König
This gets rid of two static variables (one of them being __initdata) and a static function. Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Acked-by: Uli Luckas <u.luckas@road.de>
2008-05-30There is no need to have BOOT_PARAMS_SIZE known outside of atags.cUwe Kleine-König
atags.c was the only user of KEXEC_BOOT_PARAMS_SIZE and kexec.h was only included to get that definition. Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Acked-by: Uli Luckas <u.luckas@road.de>
2008-05-19Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: [PATCH] return to old errno choice in mkdir() et.al. [Patch] fs/binfmt_elf.c: fix wrong return values [PATCH] get rid of leak in compat_execve() [Patch] fs/binfmt_elf.c: fix a wrong free [PATCH] avoid multiplication overflows and signedness issues for max_fds [PATCH] dup_fd() part 4 - race fix [PATCH] dup_fd() - part 3 [PATCH] dup_fd() part 2 [PATCH] dup_fd() fixes, part 1 [PATCH] take init_files to fs/file.c
2008-05-17[ARM] arm/kernel/arthur.c: add MODULE_LICENSEAdrian Bunk
This patch adds the missing MODULE_LICENSE("GPL"). Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-05-17[ARM] export copy_pageRussell King
Martin Michlmayr reported that fuse complains: ERROR: "copy_page" [fs/fuse/fuse.ko] undefined! so export the needed function. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-05-16[PATCH] take init_files to fs/file.cAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-05-12[ARM] dyntick: Remove obsolete and unused ARM dyntick supportRussell King
dyntick is superseded by the clocksource/clockevent infrastructure, using the NO_HZ configuration option. No one implements dyntick on ARM anymore, so it's pointless keeping it around. Remove dyntick support. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-05-03unified (weak) sys_pipe implementationUlrich Drepper
This replaces the duplicated arch-specific versions of "sys_pipe()" with one unified implementation. This removes almost 250 lines of duplicated code. It's marked __weak, so that *if* an architecture wants to override the default implementation it can do so by simply having its own replacement version, since many architectures use alternate calling conventions for the 'pipe()' system call for legacy reasons (ie traditional UNIX implementations often return the two file descriptors in registers) I still haven't changed the cris version even though Linus says the BKL isn't needed. The arch maintainer can easily do it if there are really no obstacles. Signed-off-by: Ulrich Drepper <drepper@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
* master.kernel.org:/home/rmk/linux-2.6-arm: (26 commits) [ARM] pxa: fix 1c104e0e4f6ab396960c058e95e18bdedcac945b [ARM] serial: s3c2410: platform_get_irq() may return signed unnoticed [ARM] am79c961a: platform_get_irq() may return signed unnoticed [ARM] Feroceon: Feroceon-specific WA-cache compatible {copy,clear}_user_page() [ARM] Feroceon: fix function alignment in proc-feroceon.S [ARM] Orion: catch a couple more alternative spellings of PCIe [ARM] Orion: fix orion-ehci platform resource end addresses [ARM] Orion: fix ->map_irq() PCIe bus number check [ARM] Orion: fix ioremap() optimization [ARM] feroceon: remove CONFIG_CPU_CACHE_ROUND_ROBIN check [ARM] feroceon: remove CONFIG_CPU_DCACHE_WRITETHROUGH check kprobes/arm: fix decoding of arithmetic immediate instructions kprobes/arm: fix cache flush address for instruction stub [ARM] 5022/1: Race in ARM MMCI PL18x driver, V2 [ARM] 5021/1: at91: buildfix for sam9263 + PM [ARM] 5018/1: RealView: Fix the ARM11MPCore Oprofile compilation [ARM] 5016/1: AT91: typo in mci configuration for at91cap at91sam9263 [ARM] 5017/1: pxa3xx: Report unsupported wakeup sources in pxa3xx_set_wake() [ARM] 5020/1: magician: remove __devinit marker from pasic3_leds_info [ARM] 5014/1: Cleanup reset state before entering suspend or resetting. ...
2008-04-29arm: use kbuild.h instead of macros in asm-offsets.cChristoph Lameter
Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29proc: switch /proc/bus/ecard/devices to seq_file interfaceAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Yani Ioannou <yani.ioannou@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-29proc: remove proc_root from driversAlexey Dobriyan
Remove proc_root export. Creation and removal works well if parent PDE is supplied as NULL -- it worked always that way. So, one useless export removed and consistency added, some drivers created PDEs with &proc_root as parent but removed them as NULL and so on. 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>
2008-04-29proc: remove proc_busAlexey Dobriyan
Remove proc_bus export and variable itself. Using pathnames works fine and is slightly more understandable and greppable. 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>
2008-04-28kprobes/arm: fix decoding of arithmetic immediate instructionsLennert Buytenhek
The ARM kprobes arithmetic immediate instruction decoder (space_cccc_001x()) was accidentally zero'ing out not only the Rn and Rd arguments, but the lower nibble of the immediate argument as well -- this patch fixes this. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Acked-by: Nicolas Pitre <nico@marvell.com>
2008-04-28kprobes/arm: fix cache flush address for instruction stubNicolas Pitre
It is more useful to flush the cache with the actual buffer address rather than the address containing a pointer to the buffer. Signed-off-by: Nicolas Pitre <nico@marvell.com> Acked-by: Lennert Buytenhek <buytenh@marvell.com>
2008-04-19Merge branch 'merge-fixes' into develRussell King
2008-04-19Merge branch 'omap2-upstream' into develRussell King
2008-04-19Merge branches 'arm', 'at91', 'ep93xx', 'iop', 'ks8695', 'misc', 'mxc', ↵Russell King
'ns9x', 'orion', 'pxa', 'sa1100', 's3c' and 'sparsemem' into devel
2008-04-19[ARM] Fix kernel mode preemptionRussell King
Luc Van Oostenryck reported: The code removed by this patch tested the irq_cpustat_t members __local_irq_count and __local_bh_count but these fields have been removed some time ago: http://git.kernel.org/?p=linux/kernel/git/tglx/history.git;a=commitdiff;h=3ab146c93e039dec99fec8d441a8dd046fe510cc Fix this oversight. Acked-by: Bill Gatliff <bgat@billgatliff.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-19[ARM] 4881/1: print unrecognised processor ID as part of failure messageLennert Buytenhek
If we fail to boot due to an unsupported processor ID, print the processor ID as part of the failure message. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Acked-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-19[ARM] 4852/1: Add timerfd_create, timerfd_settime and timerfd_gettime ↵Uwe Kleine-König
syscall entries Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-04-18Linux Thumb-2 support for user-space applicationsPaul Brook
This patch implements Thumb-2 application support in Linux. Original implementation by Paul Brook with fixes for VFP and Neon by Catalin Marinas. Signed-off-by: Paul Brook <paul@codesourcery.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-04-18Add a prefetch abort handlerPaul Brook
This patch adds a prefetch abort handler similar to the data abort one and renames the latter for consistency. Initial implementation by Paul Brook with some renaming by Catalin Marinas. Signed-off-by: Paul Brook <paul@codesourcery.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-04-18ARMv7: Add support for the ThumbEE state saving/restoringCatalin Marinas
This patch adds the detection and handling of the ThumbEE extension on ARMv7 CPUs. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2008-04-17Generic semaphore implementationMatthew Wilcox
Semaphores are no longer performance-critical, so a generic C implementation is better for maintainability, debuggability and extensibility. Thanks to Peter Zijlstra for fixing the lockdep warning. Thanks to Harvey Harrison for pointing out that the unlikely() was unnecessary. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Acked-by: Ingo Molnar <mingo@elte.hu>
2008-03-28[ARM] 4878/1: Add oabi shim for fstatat64Riku Voipio
Ccoreutils and other have started using fstatat64. Thus, we need a shim for it if we want to support modern oldabi userlands (such as Debian/arm/lenny) with EABI kernels. See http://bugs.debian.org/462677 Acked-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Riku Voipio <riku.voipio@movial.fi> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-03-20[ARM] 4870/1: fix signal return code when enable CONFIG_OABI_COMPATjanboe
fix signal return code when enable CONFIG_OABI_COMPAT Signed-off-by: Janboe Ye <janboe.ye@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-03-06[ARM] 4849/1: move ATAGS asm definitionsGreg Ungerer
Move the definitions of ATAG_CORE and ATAG_CORE_SIZE in head.S to head-common.S. There is no use of these in head.S itself, but they are used in head-common.S. When building for the !CONFIG_MMU case these were not defined when compiling head-nommu.S (which includes head-common.S). Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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