Re: [PATCH 12/43] kcsan: clang: retire CONFIG_KCSAN_KCOV_BROKEN

[Marco Elver]

On Wed, 15 Dec 2021 at 14:33, Mark Rutland <mark.rutland@xxxxxxx> wrote:
>
> On Tue, Dec 14, 2021 at 05:20:19PM +0100, Alexander Potapenko wrote:
> > kcov used to be broken prior to Clang 11, but right now that version is
> > already the minimum required to build with KCSAN, that is why we don't
> > need KCSAN_KCOV_BROKEN anymore.
>
> Just to check, how is that requirement enforced?

HAVE_KCSAN_COMPILER will only be true with Clang 11 or later, due to
no prior compiler having "-tsan-distinguish-volatile=1".

> I see the core Makefiles enforce 10.0.1+, but I couldn't spot an explicit
> version dependency in Kconfig.kcsan.
>
> Otherwise, this looks good to me!

I think 5.17 will be Clang 11 only, so we could actually revert
ea91a1d45d19469001a4955583187b0d75915759:
https://lkml.kernel.org/r/Yao86FeC2ybOobLO@archlinux-ax161

I should resend that to be added to the -kbuild tree.