From: "Andi Kleen" To avoid some code duplication. Signed-off-by: Andi Kleen Signed-off-by: Andrew Morton --- 25-akpm/arch/x86_64/mm/fault.c | 12 +++++------- 25-akpm/include/asm-x86_64/ptrace.h | 3 +++ 2 files changed, 8 insertions(+), 7 deletions(-) diff -puN arch/x86_64/mm/fault.c~x86_64-use-a-common-function-to-find-code-segment-bases arch/x86_64/mm/fault.c --- 25/arch/x86_64/mm/fault.c~x86_64-use-a-common-function-to-find-code-segment-bases Thu Apr 7 15:10:45 2005 +++ 25-akpm/arch/x86_64/mm/fault.c Thu Apr 7 15:10:45 2005 @@ -62,21 +62,19 @@ void bust_spinlocks(int yes) static noinline int is_prefetch(struct pt_regs *regs, unsigned long addr, unsigned long error_code) { - unsigned char *instr = (unsigned char *)(regs->rip); + unsigned char *instr; int scan_more = 1; int prefetch = 0; - unsigned char *max_instr = instr + 15; + unsigned char *max_instr; /* If it was a exec fault ignore */ if (error_code & (1<<4)) return 0; - /* Code segments in LDT could have a non zero base. Don't check - when that's possible */ - if (regs->cs & (1<<2)) - return 0; + instr = (unsigned char *)convert_rip_to_linear(current, regs); + max_instr = instr + 15; - if ((regs->cs & 3) != 0 && regs->rip >= TASK_SIZE) + if ((regs->cs & 3) != 0 && instr >= (unsigned char *)TASK_SIZE) return 0; while (scan_more && instr < max_instr) { diff -puN include/asm-x86_64/ptrace.h~x86_64-use-a-common-function-to-find-code-segment-bases include/asm-x86_64/ptrace.h --- 25/include/asm-x86_64/ptrace.h~x86_64-use-a-common-function-to-find-code-segment-bases Thu Apr 7 15:10:45 2005 +++ 25-akpm/include/asm-x86_64/ptrace.h Thu Apr 7 15:10:45 2005 @@ -86,6 +86,9 @@ struct pt_regs { extern unsigned long profile_pc(struct pt_regs *regs); void signal_fault(struct pt_regs *regs, void __user *frame, char *where); +extern unsigned long +convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs); + enum { EF_CF = 0x00000001, EF_PF = 0x00000004, _