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Commit 3927fa9e authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar
Browse files

x86: use frame pointer information on x86_64 profile_pc 



Signed-off-by: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 097a0788

arch/x86/kernel/time_64.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

}