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>
git-mirror · Oct 13, 2008 · 3927fa9 · 3927fa9
1 parent 097a078
commit 3927fa9
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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;
 }