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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>
This commit is contained in:
Glauber Costa 2008-07-11 13:53:43 -03:00 committed by Ingo Molnar
parent 097a0788df
commit 3927fa9e4b
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/time_64.c
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@ -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;
}