Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
[PATCH] x86_64: Remove unused AMD K8 C stepping flag
X86_FEATURE_K8_C was a synthetic Linux CPUID flag that was used for some
code optimizations in Opteron C stepping or later. But support for pre C
stepping optimizations has been removed, so this isn't needed anymore.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
authored by Andi Kleen and committed by Linus Torvalds dd52d642 2e664aa2
-6
arch/x86_64/kernel/setup.c
-6
arch/x86_64/kernel/setup.c
···
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static int __init init_amd(struct cpuinfo_x86 *c)
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{
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int r;
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-
int level;
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#ifdef CONFIG_SMP
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unsigned long value;
···
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3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
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clear_bit(0*32+31, &c->x86_capability);
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-
/* C-stepping K8? */
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-
level = cpuid_eax(1);
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if ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
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set_bit(X86_FEATURE_K8_C, &c->x86_capability);
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-
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r = get_model_name(c);
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if (!r) {
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switch (c->x86) {
+1
-1
include/asm-x86_64/cpufeature.h
+1
-1
include/asm-x86_64/cpufeature.h
···
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#define X86_FEATURE_K6_MTRR (3*32+ 1) /* AMD K6 nonstandard MTRRs */
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#define X86_FEATURE_CYRIX_ARR (3*32+ 2) /* Cyrix ARRs (= MTRRs) */
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#define X86_FEATURE_CENTAUR_MCR (3*32+ 3) /* Centaur MCRs (= MTRRs) */
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-
#define X86_FEATURE_K8_C (3*32+ 4) /* C stepping K8 */
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+
/* 4 free */
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#define X86_FEATURE_CONSTANT_TSC (3*32+5) /* TSC runs at constant rate */
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#define X86_FEATURE_SYNC_RDTSC (3*32+6) /* RDTSC syncs CPU core */
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