On 2021-06-18, Nick Desaulniers wrote:

When we say noinstr, we mean noinstr.  GCOV and PGO can both instrument
functions. Add a new function annotation __no_profile that expands to
__attribute__((__no_profile__)) and Kconfig value
CC_HAS_NO_PROFILE_FN_ATTR.

Base is
https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=for-next/clang/pgo.

Nick Desaulniers (2):
 compiler_attributes.h: define __no_profile, add to noinstr
 Kconfig: CC_HAS_NO_PROFILE_FN_ATTR, depend on for GCOV and PGO

include/linux/compiler_attributes.h | 12 ++++++++++++
include/linux/compiler_types.h      |  2 +-
init/Kconfig                        |  3 +++
kernel/gcov/Kconfig                 |  1 +
kernel/pgo/Kconfig                  |  3 ++-
5 files changed, 19 insertions(+), 2 deletions(-)


base-commit: 4356bc4c0425c81e204f561acf4dd0095544a6cb
-- 
2.32.0.288.g62a8d224e6-goog

Thanks for the attribute work in clang and kernel! Hope we can use clang
PGO in 5.14...  (I am a casual contributor to clang PGO/coverage)