Re: [PATCH 0/3] arm64: perf: Make compat tracing better

From: Doug Anderson
Date: Tue May 25 2021 - 11:04:38 EST

Catalin / Will,

On Fri, May 7, 2021 at 1:55 PM Douglas Anderson <dianders@xxxxxxxxxxxx> wrote:
> The goal for this series is to improve "perf" behavior when 32-bit
> userspace code is involved. This turns out to be fairly important for
> Chrome OS which still runs 32-bit userspace for the time being (long
> story there).
> I won't repeat everything said in the individual patches since since
> they are wordy enough as it is.
> Please enjoy and I hope this isn't too ugly/hacky for inclusion in
> mainline.
> Thanks to Nick Desaulniers for his early review of these patches and
> to Ricky for the super early prototype that some of this is based on.
> Douglas Anderson (3):
> arm64: perf: perf_callchain_user() compat support for
> clang/non-APCS-gcc-arm
> arm64: perf: Improve compat perf_callchain_user() for clang leaf
> functions
> arm64: perf: Add a config option saying 32-bit thumb code uses R11 for
> FP
> arch/arm64/Kconfig | 12 ++
> arch/arm64/kernel/perf_callchain.c | 329 +++++++++++++++++++++++++----
> 2 files changed, 305 insertions(+), 36 deletions(-)

While this isn't massively urgent, I'd like to confirm that this is on
your plate to eventually review and/or land. If it's not, do you have
any suggestions for how I should proceed?