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linux-sg2042
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x86: bugfix wbinvd() model check instead of family check 

wbinvd is supported on all CPUs 486 or later. But,
pageattr.c is checking x86_model >= 4 before wbinvd(), which looks like
an oversight bug. It was first introduced at one place by changeset
d7c8f21a8c and got copied over to second
place in the same file later.

[ Impact: fix missing cache flush on early-model CPUs, potential data corruption ]

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
venkatesh.pallipadi@intel.com 2009-05-22 13:23:37 -07:00 committed by H. Peter Anvin
parent 0c752a9335
commit 0b827537e3
1 changed files with 2 additions and 2 deletions
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4
arch/x86/mm/pageattr.c
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@ -153,7 +153,7 @@ static void __cpa_flush_all(void *arg)
*/
__flush_tlb_all();
if (cache && boot_cpu_data.x86_model >= 4)
if (cache && boot_cpu_data.x86 >= 4)
wbinvd();
}
@ -218,7 +218,7 @@ static void cpa_flush_array(unsigned long *start, int numpages, int cache,
/* 4M threshold */
if (numpages >= 1024) {
if (boot_cpu_data.x86_model >= 4)
if (boot_cpu_data.x86 >= 4)
wbinvd();
return;
}