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

commit abc41254181e901ef5eda2c884ca6cd88a186b6d upstream.

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>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 1e49e5eb81e977fe44fccc369be1974617680cac..9ba33c40cdf8f841e974f68e599f0f97e87138ff 100644 (file)
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -1336,6 +1336,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
                return;
        }
 
+       perf_callchain_store(entry, regs->pc);
        tail = (struct frame_tail __user *)regs->regs[29];
 
        while (entry->nr < PERF_MAX_STACK_DEPTH &&