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
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asm	alpha: select CONFIG_ARCH_USE_CMPXCHG_LOCKREF.	2015-08-30 18:01:16 -07:00
uapi/asm	alpha: Wire up all missing implemented syscalls	2015-05-26 10:01:50 -07:00