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perf: arm64: Record the user-mode PC in the call chain. 

With this change, we no longer lose the innermost entry in the user-mode
part of the call chain.  See also the x86 port, which includes the ip,
and the corresponding change in arch/arm.

Signed-off-by: Jed Davis <jld@mozilla.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Jed Davis 2013-06-20 04:07:14 +01:00 committed by Catalin Marinas
parent 7d13205581
commit abc4125418
1 changed files with 1 additions and 0 deletions
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arch/arm64/kernel/perf_event.c
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@ -1336,6 +1336,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
return; return;
} }
perf_callchain_store(entry, regs->pc);
tail = (struct frame_tail __user *)regs->regs[29]; tail = (struct frame_tail __user *)regs->regs[29];
while (entry->nr < PERF_MAX_STACK_DEPTH && while (entry->nr < PERF_MAX_STACK_DEPTH &&