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
atomic.h	Christoph has moved	2008-07-04 10:40:04 -07:00
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h
audit_write.h
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
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
errno-base.h
errno.h
fcntl.h
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
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
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
kdebug.h
libata-portmap.h
local.h
memory_model.h	remove __KERNEL__ tests of unexported headers under asm-generic/	2008-04-30 08:29:54 -07:00
mm_hooks.h
mman.h
mutex-dec.h	mutex: speed up generic mutex implementations	2008-10-23 09:18:20 -07:00
mutex-null.h
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
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
resource.h
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
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
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