[PATCH v2 3/3] Kconfig: add ARCH_WANTS_NO_INSTR+CC_HAS_NO_PROFILE_FN_ATTR, depend on for GCOV and PGO

[Will Deacon]

On Tue, Jun 22, 2021 at 10:05:40AM +0100, Mark Rutland wrote:
> On Mon, Jun 21, 2021 at 04:18:22PM -0700, Nick Desaulniers wrote:
> > We don't want compiler instrumentation to touch noinstr functions, which
> > are annotated with the no_profile_instrument_function function
> > attribute. Add a Kconfig test for this and make PGO and GCOV depend on
> > it.
> > 
> > If an architecture is using noinstr, it should denote that via this
> > Kconfig value. That makes Kconfigs that depend on noinstr able to
> > express dependencies in an architecturally agnostic way.
> > 
> > Cc: Masahiro Yamada <masahiroy at kernel.org>
> > Cc: Peter Oberparleiter <oberpar at linux.ibm.com>
> > Link: https://lore.kernel.org/lkml/YMTn9yjuemKFLbws@hirez.programming.kicks-ass.net/
> > Link: https://lore.kernel.org/lkml/YMcssV%2Fn5IBGv4f0@hirez.programming.kicks-ass.net/
> > Suggested-by: Nathan Chancellor <nathan at kernel.org>
> > Suggested-by: Peter Zijlstra <peterz at infradead.org>
> > Signed-off-by: Nick Desaulniers <ndesaulniers at google.com>
> 
> FWIW, this looks good to me:
> 
> Acked-by: Mark Rutland <mark.rutland at arm.com>
> 
> Catalin, Will, are you happy iwth the arm64 bit?

Looks fine to me.

Will