perf/x86: Fix PEBS instruction unwind

commit 57d1c0c03c6b48b2b96870d831b9ce6b917f53ac upstream.

Masami spotted that we always try to decode the instruction stream as
64bit instructions when running a 64bit kernel, this doesn't work for
ia32-compat proglets.

Use TIF_IA32 to detect if we need to use the 32bit instruction
decoder.

Reported-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 1b1ef3addcfdbff04f692ec6c19c984d9a912b0a..3213c52db7649aad88612ce8a83ceba2ecf9cc28 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -508,6 +508,7 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
        unsigned long from = cpuc->lbr_entries[0].from;
        unsigned long old_to, to = cpuc->lbr_entries[0].to;
        unsigned long ip = regs->ip;
+       int is_64bit = 0;
 
        /*
         * We don't need to fixup if the PEBS assist is fault like
@@ -559,7 +560,10 @@ static int intel_pmu_pebs_fixup_ip(struct pt_regs *regs)
                } else
                        kaddr = (void *)to;
 
-               kernel_insn_init(&insn, kaddr);
+#ifdef CONFIG_X86_64
+               is_64bit = kernel_ip(to) || !test_thread_flag(TIF_IA32);
+#endif
+               insn_init(&insn, kaddr, is_64bit);
                insn_get_length(&insn);
                to += insn.length;
        } while (to < ip);