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| author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2009-05-22 13:23:37 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-05-22 13:33:27 -0700 |
| commit | 0b827537e339c084ac9384df588969d400be9e0d (patch) | |
| tree | 26ae170ba3fd7077c28613f8cc7aba7d1b133430 | |
| parent | 0c752a93353d9b17dbe148312d732fbe06d235e1 (diff) | |
| download | op-kernel-dev-0b827537e339c084ac9384df588969d400be9e0d.zip op-kernel-dev-0b827537e339c084ac9384df588969d400be9e0d.tar.gz | |
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
d7c8f21a8cad0228c7c5ce2bb6dbd95d1ee49d13 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>
| -rw-r--r-- | arch/x86/mm/pageattr.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 797f9f1..2cc019a 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -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; } |
