On Tue, Jun 22, 2021 at 10:29:37AM +0100, Mark Rutland wrote:

On Tue, Jun 22, 2021 at 10:25:34AM +0100, Catalin Marinas wrote:

quoted

On Mon, Jun 21, 2021 at 01:43:54PM -0700, Nick Desaulniers wrote:

quoted

We need to be able to express via Kconfig "GCOV should not be enabled
for architectures that use noinstr when the toolchain does not support
__attribute__((no_profile_instrument_function))."

Where "architectures that use noinstr" are currently arm64, s390, and
x86.  So I guess we could do:

+ depends on !ARM64 || !S390 || !X86 || CC_HAS_NO_PROFILE_FN_ATTR

I think you want:

  depends on !(ARM64 || S390 || X86) || CC_HAS_NO_PROFILE_FN_ATTR

quoted

(We could add a Kconfig for ARCH_WANTS_NO_INSTR, which might be more
informative than listed out architectures which might be non-obvious
to passers-by).

That would probably look better.

It does; see:

https://lore.kernel.org/r/20210621231822.2848305-1-ndesaulniers@google.com (local)

I'm getting there, eventually ;).

-- 
Catalin