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Nick Piggin a8ddac7e53 mutex: speed up generic mutex implementations 
- atomic operations which both modify the variable and return something imply
  full smp memory barriers before and after the memory operations involved
  (failing atomic_cmpxchg, atomic_add_unless, etc don't imply a barrier because
  they don't modify the target). See Documentation/atomic_ops.txt.
  So remove extra barriers and branches.

- All architectures support atomic_cmpxchg. This has no relation to
  __HAVE_ARCH_CMPXCHG. We can just take the atomic_cmpxchg path unconditionally

This reduces a simple single threaded fastpath lock+unlock test from 590 cycles
to 203 cycles on a ppc970 system.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-10-23 09:18:20 -07:00
..
bitops bitops: use __fls for fls64 on 64-bit archs 2008-04-26 19:21:16 +02:00
4level-fixup.h add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
Kbuild types: create <asm-generic/int-*.h> 2008-05-02 16:18:19 -07:00
Kbuild.asm Fix conditional export of kvh.h and a.out.h to userspace. 2008-09-05 15:44:31 +01:00
atomic.h Christoph has moved 2008-07-04 10:40:04 -07:00
audit_change_attr.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_dir_write.h [PATCH] fix missing ifdefs in syscall classes hookup for generic targets 2006-09-22 17:48:56 -07:00
audit_read.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
audit_signal.h [PATCH] add SIGNAL syscall class (v3) 2007-05-11 05:38:25 -04:00
audit_write.h [PATCH] audit: more syscall classes added 2006-09-11 13:32:27 -04:00
bitops.h remove __KERNEL__ tests of unexported headers under asm-generic/ 2008-04-30 08:29:54 -07:00
bug.h fix WARN() for PPC 2008-10-20 15:29:57 -07:00
cmpxchg-local.h Add cmpxchg_local to asm-generic for per cpu atomic operations 2008-02-07 08:42:30 -08:00
cmpxchg.h Add cmpxchg_local to asm-generic for per cpu atomic operations 2008-02-07 08:42:30 -08:00
cputime.h taskstats scaled time cleanup 2008-02-06 10:41:00 -08:00
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
div64.h rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
dma-coherent.h generic: per-device coherent dma allocator 2008-06-30 12:51:05 +02:00
dma-mapping-broken.h dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
dma-mapping.h dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
emergency-restart.h [PATCH] Add emergency_restart() 2005-07-26 14:35:41 -07:00
errno-base.h
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errno.h
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fcntl.h Introduce O_CLOEXEC 2007-07-16 09:05:45 -07:00
futex.h remove __KERNEL__ tests of unexported headers under asm-generic/ 2008-04-30 08:29:54 -07:00
gpio.h gpiolib: request/free hooks 2008-10-16 11:21:40 -07:00
ide_iops.h
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int-l64.h types: add C99-style constructors to <asm-generic/int-*.h> 2008-05-02 16:18:42 -07:00
int-ll64.h asm-generic/int-ll64.h: always provide __{s,u}64 2008-07-25 10:53:27 -07:00
ioctl.h Make ioctl.h compatible with userland 2008-08-12 16:07:31 -07:00
iomap.h generic: add ioremap_wc() interface wrapper 2008-04-24 23:40:47 +02:00
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
kdebug.h move die notifier handling to common code 2007-05-08 11:15:04 -07:00
libata-portmap.h libata-portmap: Remove unused definitions 2007-10-12 14:55:37 -04:00
local.h local_t: architecture independent extension 2007-05-08 11:15:20 -07:00
memory_model.h remove __KERNEL__ tests of unexported headers under asm-generic/ 2008-04-30 08:29:54 -07:00
mm_hooks.h [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction 2007-05-02 19:27:14 +02:00
mman.h [PATCH] Remove final references to deprecated "MAP_ANON" page protection flag 2007-02-11 10:51:17 -08:00
mutex-dec.h mutex: speed up generic mutex implementations 2008-10-23 09:18:20 -07:00
mutex-null.h fix file specification in comments 2006-10-03 23:01:26 +02:00
mutex-xchg.h mutex: speed up generic mutex implementations 2008-10-23 09:18:20 -07:00
page.h remove __KERNEL__ tests of unexported headers under asm-generic/ 2008-04-30 08:29:54 -07:00
pci-dma-compat.h dma-mapping: add the device argument to dma_mapping_error() 2008-07-26 12:00:03 -07:00
pci.h [PATCH] Make sparc64 use setup-res.c 2005-09-08 14:57:25 -07:00
percpu.h percpu: fix DEBUG_PREEMPT per_cpu checking 2008-02-23 12:09:28 -08:00
pgtable-nopmd.h include/asm-generic/pgtable-nopmd.h: macros are noxious, reason #435 2008-07-28 16:30:21 -07:00
pgtable-nopud.h add mm argument to pte/pmd/pud/pgd_free 2008-02-05 09:44:18 -08:00
pgtable.h mm: fix build on non-mmu machines 2008-07-15 13:58:40 -07:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
resource.h sched: SCHED_FIFO/SCHED_RR watchdog timer 2008-01-25 21:08:27 +01:00
rtc.h rtc: use bcd2bin/bin2bcd 2008-10-20 08:52:41 -07:00
sections.h lib: Correct printk %pF to work on all architectures 2008-09-09 11:51:15 -07:00
siginfo.h signals: demultiplexing SIGTRAP signal 2008-09-23 13:26:52 +02:00
signal.h Add standard include guard to asm-generic/signal and use compiler.h 2006-04-27 06:57:23 +01:00
statfs.h Make <asm-generic/statfs.h> suitable for 64-bit platforms. 2008-09-04 09:46:08 +01:00
syscall.h tracehook: comment pasto fixes 2008-09-05 14:39:38 -07:00
termios.h tty: let architectures override the user/kernel macros. 2008-02-08 09:22:24 -08:00
tlb.h asm-generic/tlb.h: remove <linux/quicklist.h> 2008-02-04 16:48:00 +01:00
topology.h x86: change _node_to_cpumask_ptr to return const ptr 2008-07-13 19:11:58 +02:00
uaccess.h
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vmlinux.lds.h Merge branch 'tracing-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-20 13:35:07 -07:00
xor.h
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