Catalin / Will,

On Fri, May 7, 2021 at 1:55 PM Douglas Anderson [off-list ref] 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?

Thanks!

-Doug

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