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x86: c_p_a clflush_cache_range fix

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Because in i386 early boot stage, boot_cpu_data may be not available,
which makes clflush_cach_range() into infinite loop, which is called
by change_page_attr(). This patch fixes this by setting
boot_cpu_data.x86_clflush_size in early_cpu_detect().

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Huang, Ying 2008-01-31 22:05:45 +01:00 committed by Ingo Molnar
parent 5827040df0
commit d4387bd3fa
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/cpu/common.c
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@ -274,8 +274,10 @@ void __init cpu_detect(struct cpuinfo_x86 *c)
if (c->x86 >= 0x6)
c->x86_model += ((tfms >> 16) & 0xF) << 4;
c->x86_mask = tfms & 15;
if (cap0 & (1<<19))
if (cap0 & (1<<19)) {
c->x86_cache_alignment = ((misc >> 8) & 0xff) * 8;
c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
}
}
}
static void __cpuinit early_get_cap(struct cpuinfo_x86 *c)
@ -317,6 +319,7 @@ static void __init early_cpu_detect(void)
struct cpuinfo_x86 *c = &boot_cpu_data;
c->x86_cache_alignment = 32;
c->x86_clflush_size = 32;
if (!have_cpuid_p())
return;