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x86: Remove CONFIG_X86_OOSTORE

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This was an optimization that made memcpy type benchmarks a little
faster on ancient (Circa 1998) IDT Winchip CPUs.  In real-life
workloads, it wasn't even noticable, and I doubt anyone is running
benchmarks on 16 year old silicon any more.

Given this code has likely seen very little use over the last decade,
let's just remove it.

Signed-off-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Jones
2014-03-10 19:32:22 -04:00
committed by Linus Torvalds
parent 8712a00514
commit 09df7c4c80
6 changed files with 5 additions and 290 deletions
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4
arch/x86/um/asm/barrier.h
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@@ -40,11 +40,7 @@
#define smp_rmb() barrier()
#endif /* CONFIG_X86_PPRO_FENCE */
#ifdef CONFIG_X86_OOSTORE
#define smp_wmb() wmb()
#else /* CONFIG_X86_OOSTORE */
#define smp_wmb() barrier()
#endif /* CONFIG_X86_OOSTORE */
#define smp_read_barrier_depends() read_barrier_depends()
#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)