Matt Turner 8f8dcb3f7f alpha: select CONFIG_ARCH_USE_CMPXCHG_LOCKREF. ... On Alpha we have spinlocks that are 32b in size and an efficient cmpxchg64 implementation, so we qualify to make use of cmpxchg backed lockrefs. Select the ARCH_USE_CMPXCHG_LOCKREF Kconfig symbol and provide a trivial implementation of arch_spin_value_unlocked to satisfy the lockref code. Using Linus' simple testcase from http://article.gmane.org/gmane.linux.file-systems/77466 on a dual CPU ES47 system I see around an 8% gain: N Min Max Median Avg Stddev x 30 6194580 6295654 6272504 6272514 17694.232 + 30 6731164 6786334 6767982 6764274 13738.863 Difference at 95.0% confidence 491760 +/- 8188.17 7.83992% +/- 0.130541% (Student's t, pooled s = 15840.5) Signed-off-by: Matt Turner <mattst88@gmail.com>		2015-08-30 18:01:16 -07:00
..
boot	alpha: Fix bootpfile and bootpzfile make targets	2015-05-26 10:01:50 -07:00
include	alpha: select CONFIG_ARCH_USE_CMPXCHG_LOCKREF.	2015-08-30 18:01:16 -07:00
kernel	PCI changes for the v4.2 merge window:	2015-06-23 13:41:24 -07:00
lib	alpha: fix broken network checksum	2014-01-31 09:21:55 -08:00
math-emu	alpha: change to new Makefile flag variables	2011-01-17 05:42:13 +01:00
mm	mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler	2015-05-19 08:39:15 +02:00
oprofile	alpha: delete non-required instances of <linux/init.h>	2015-05-26 10:01:48 -07:00
defconfig	defconfig reduction	2010-08-14 22:26:53 +02:00
Kconfig	alpha: select CONFIG_ARCH_USE_CMPXCHG_LOCKREF.	2015-08-30 18:01:16 -07:00
Kconfig.debug
Makefile	alpha: makefile: don't enforce small data model for kernel builds	2013-04-07 12:59:30 -07:00