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x86: remove nx_enabled from fault.c 

On !PAE 32-bit, _PAGE_NX will be 0, making is_prefetch always
return early.  The test is sufficient on PAE as __supported_pte_mask
is updated in the same places as nx_enabled in init_32.c which also
takes disable_nx into account.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Harvey Harrison 2008-01-30 13:34:11 +01:00 committed by Ingo Molnar
parent c61e211d99
commit b406ac61e9
1 changed files with 3 additions and 8 deletions
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11
arch/x86/mm/fault.c
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@ -92,18 +92,13 @@ static int is_prefetch(struct pt_regs *regs, unsigned long addr,
unsigned char *max_instr;
#ifdef CONFIG_X86_32
# ifdef CONFIG_X86_PAE
/* If it was a exec fault on NX page, ignore */
if (nx_enabled && (error_code & PF_INSTR))
if (!(__supported_pte_mask & _PAGE_NX))
return 0;
# else
return 0;
# endif
#else /* CONFIG_X86_64 */
#endif
/* If it was a exec fault on NX page, ignore */
if (error_code & PF_INSTR)
return 0;
#endif
instr = (unsigned char *)convert_ip_to_linear(current, regs);
max_instr = instr + 15;