diff options
| author | Huang, Ying <ying.huang@intel.com> | 2008-01-31 22:05:45 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-31 22:05:45 +0100 |
| commit | d4387bd3fa1d27e03bc87533c1650e24417c8016 (patch) | |
| tree | 14103cb3d7d19f05c70ca5747c2c1c452c013dc9 /arch | |
| parent | 5827040df095d8dd6b5ca155dc4bfb5bafcb6ca2 (diff) | |
| download | linux-d4387bd3fa1d27e03bc87533c1650e24417c8016.tar.gz linux-d4387bd3fa1d27e03bc87533c1650e24417c8016.tar.xz | |
x86: c_p_a clflush_cache_range fix
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/common.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index db28aa9e2f69..d608c9ebbfe2 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -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; |