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| author | Ingo Molnar <mingo@elte.hu> | 2009-05-29 09:25:09 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-14 20:37:15 (GMT) |
| commit | 5a6cec3abbdb74244caab68db100825a8c4ac02d (patch) | |
| tree | 9384519dc432104ba75cc14565866fa1a6deb051 /arch/x86/kernel/cpu/perf_counter.c | |
| parent | 3efa1cc99ec51bc7a7ae0011a16619fd20dbe6ea (diff) | |
| download | linux-fsl-qoriq-5a6cec3abbdb74244caab68db100825a8c4ac02d.tar.xz | |
perf_counter, x86: Fix call-chain walking
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>
Diffstat (limited to 'arch/x86/kernel/cpu/perf_counter.c')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_counter.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 77a59a5..09d8cb6 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -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); |