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perf_counter, x86: Fix call-chain walking

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Fix the ptregs variant when we hit user-mode tasks.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-05-29 11:25:09 +02:00
parent 3efa1cc99e
commit 5a6cec3abb
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/cpu/perf_counter.c
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@ -1644,7 +1644,9 @@ perf_callchain_user(struct pt_regs *regs, struct perf_callchain_entry *entry)
const void __user *fp;
int nr = entry->nr;
regs = (struct pt_regs *)current->thread.sp0 - 1;
if (!user_mode(regs))
regs = task_pt_regs(current);
fp = (void __user *)regs->bp;
callchain_store(entry, regs->ip);
@ -1656,7 +1658,7 @@ perf_callchain_user(struct pt_regs *regs, struct perf_callchain_entry *entry)
if (!copy_stack_frame(fp, &frame))
break;
if ((unsigned long)fp < user_stack_pointer(regs))
if ((unsigned long)fp < regs->sp)
break;
callchain_store(entry, frame.return_address);