x86: fix prefetch workaround

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 <mingo@elte.hu>

parent 08dcf29e

arch/x86/mm/fault.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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