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[PATCH] md: RAID6: clean up CPUID and FPU enter/exit code

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- Use kernel_fpu_begin() and kernel_fpu_end()
- Use boot_cpu_has() for feature testing even in userspace

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
H. Peter Anvin
2007-02-28 20:11:25 -08:00
committed by Linus Torvalds
parent 64a742bc61
commit a723406c4a
4 changed files with 34 additions and 243 deletions
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17
drivers/md/raid6sse1.c
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@@ -33,16 +33,10 @@ extern const struct raid6_mmx_constants {
static int raid6_have_sse1_or_mmxext(void)
{
#ifdef __KERNEL__
/* Not really boot_cpu but "all_cpus" */
return boot_cpu_has(X86_FEATURE_MMX) &&
(boot_cpu_has(X86_FEATURE_XMM) ||
boot_cpu_has(X86_FEATURE_MMXEXT));
#else
/* User space test code - this incorrectly breaks on some Athlons */
u32 features = cpuid_features();
return ( (features & (5<<23)) == (5<<23) );
#endif
}
/*
@@ -53,14 +47,12 @@ static void raid6_sse11_gen_syndrome(int disks, size_t bytes, void **ptrs)
u8 **dptr = (u8 **)ptrs;
u8 *p, *q;
int d, z, z0;
raid6_mmx_save_t sa;
z0 = disks - 3; /* Highest data disk */
p = dptr[z0+1]; /* XOR parity */
q = dptr[z0+2]; /* RS syndrome */
/* This is really MMX code, not SSE */
raid6_before_mmx(&sa);
kernel_fpu_begin();
asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
asm volatile("pxor %mm5,%mm5"); /* Zero temp */
@@ -94,8 +86,8 @@ static void raid6_sse11_gen_syndrome(int disks, size_t bytes, void **ptrs)
asm volatile("movntq %%mm4,%0" : "=m" (q[d]));
}
raid6_after_mmx(&sa);
asm volatile("sfence" : : : "memory");
kernel_fpu_end();
}
const struct raid6_calls raid6_sse1x1 = {
@@ -113,13 +105,12 @@ static void raid6_sse12_gen_syndrome(int disks, size_t bytes, void **ptrs)
u8 **dptr = (u8 **)ptrs;
u8 *p, *q;
int d, z, z0;
raid6_mmx_save_t sa;
z0 = disks - 3; /* Highest data disk */
p = dptr[z0+1]; /* XOR parity */
q = dptr[z0+2]; /* RS syndrome */
raid6_before_mmx(&sa);
kernel_fpu_begin();
asm volatile("movq %0,%%mm0" : : "m" (raid6_mmx_constants.x1d));
asm volatile("pxor %mm5,%mm5"); /* Zero temp */
@@ -157,8 +148,8 @@ static void raid6_sse12_gen_syndrome(int disks, size_t bytes, void **ptrs)
asm volatile("movntq %%mm6,%0" : "=m" (q[d+8]));
}
raid6_after_mmx(&sa);
asm volatile("sfence" : :: "memory");
kernel_fpu_end();
}
const struct raid6_calls raid6_sse1x2 = {