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x86: fix prefetch workaround

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some early Athlon XP's and Opterons generate bogus faults on prefetch
instructions. The workaround for this regressed over .24 - reinstate it.

Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2008-03-27 15:58:28 +01:00
commit bc713dcf35
1 changed files with 2 additions and 1 deletions
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3
arch/x86/mm/fault.c
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@ -92,7 +92,8 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr,
unsigned char *max_instr;
#ifdef CONFIG_X86_32
if (!(__supported_pte_mask & _PAGE_NX))
/* Catch an obscure case of prefetch inside an NX page: */
if ((__supported_pte_mask & _PAGE_NX) && (error_code & 16))
return 0;
#endif