Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d4387b...
Commit: d4387bd3fa1d27e03bc87533c1650e24417c8016
Parent: 5827040df095d8dd6b5ca155dc4bfb5bafcb6ca2
Author: Huang, Ying <ying.huang@intel.com>
AuthorDate: Thu Jan 31 22:05:45 2008 +0100
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu Jan 31 22:05:45 2008 +0100
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>
---
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 db28aa9..d608c9e 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;
-
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