x86: use frame pointer information on x86_64 profile_pc

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index e3d49c553af2..7fd995edb762 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -34,11 +34,15 @@ unsigned long profile_pc(struct pt_regs *regs)
            of flags from PUSHF
            Eflags always has bits 22 and up cleared unlike kernel addresses. */
         if (!user_mode(regs) && in_lock_functions(pc)) {
+#ifdef CONFIG_FRAME_POINTER
+                return *(unsigned long *)(regs->bp + sizeof(long));
+#else
                 unsigned long *sp = (unsigned long *)regs->sp;
                 if (sp[0] >> 22)
                         return sp[0];
                 if (sp[1] >> 22)
                         return sp[1];
+#endif
         }
         return pc;
 }