This is a note to let you know that I've just added the patch titled ARM: 7765/1: perf: Record the user-mode PC in the call chain. to the 3.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm-7765-1-perf-record-the-user-mode-pc-in-the-call-chain.patch and it can be found in the queue-3.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From c5f927a6f62196226915f12194c9d0df4e2210d7 Mon Sep 17 00:00:00 2001 From: Jed Davis <jld@xxxxxxxxxxx> Date: Thu, 20 Jun 2013 10:16:29 +0100 Subject: ARM: 7765/1: perf: Record the user-mode PC in the call chain. From: Jed Davis <jld@xxxxxxxxxxx> commit c5f927a6f62196226915f12194c9d0df4e2210d7 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. It's possible to partially work around this problem by post-processing the data to use the PERF_SAMPLE_IP value, but this works only if the CPU wasn't in the kernel when the sample was taken. Signed-off-by: Jed Davis <jld@xxxxxxxxxxx> Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm/kernel/perf_event.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -824,6 +824,7 @@ perf_callchain_user(struct perf_callchai struct frame_tail __user *tail; + perf_callchain_store(entry, regs->ARM_pc); tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) && Patches currently in stable-queue which might be from jld@xxxxxxxxxxx are queue-3.4/arm-7765-1-perf-record-the-user-mode-pc-in-the-call-chain.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html