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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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16
drivers/md/raid6mmx.c
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@ -30,14 +30,8 @@ const struct raid6_mmx_constants {
static int raid6_have_mmx(void)
{
#ifdef __KERNEL__
/* Not really "boot_cpu" but "all_cpus" */
return boot_cpu_has(X86_FEATURE_MMX);
#else
/* User space test code */
u32 features = cpuid_features();
return ( (features & (1<<23)) == (1<<23) );
#endif
}
/*
@ -48,13 +42,12 @@ static void raid6_mmx1_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 */
@ -78,7 +71,7 @@ static void raid6_mmx1_gen_syndrome(int disks, size_t bytes, void **ptrs)
asm volatile("pxor %mm4,%mm4");
}
raid6_after_mmx(&sa);
kernel_fpu_end();
}
const struct raid6_calls raid6_mmxx1 = {
@ -96,13 +89,12 @@ static void raid6_mmx2_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 */
@ -137,7 +129,7 @@ static void raid6_mmx2_gen_syndrome(int disks, size_t bytes, void **ptrs)
asm volatile("movq %%mm6,%0" : "=m" (q[d+8]));
}
raid6_after_mmx(&sa);
kernel_fpu_end();
}
const struct raid6_calls raid6_mmxx2 = {