Re: [PATCH] KMSAN: Restore dynamic check for '-fsanitize=kernel-memory'

[Nathan Chancellor]

On Thu, Oct 23, 2025 at 11:54:35PM +0100, Nathan Chancellor wrote:
> On Thu, 23 Oct 2025 21:01:29 +0200, Nathan Chancellor wrote:
> > Commit 5ff8c11775c7 ("KMSAN: Remove tautological checks") changed
> > CONFIG_HAVE_KMSAN_COMPILER from a dynamic check for
> > '-fsanitize=kernel-memory' to just being true for CONFIG_CC_IS_CLANG.
> > This missed the fact that not all architectures supported
> > '-fsanitize=kernel-memory' at the same time. For example, SystemZ / s390
> > gained support for KMSAN in clang-18 [1], so builds with clang-15
> > through clang-17 can select KMSAN but they error with:
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/1] KMSAN: Restore dynamic check for '-fsanitize=kernel-memory'
>       https://git.kernel.org/kbuild/c/a16758f0142ab

Whoops, sent the applied message for the wrong change... This is going
to be in kbuild-fixes as https://git.kernel.org/kbuild/c/3423b2866797c
for -next testing but I will adjust it for any tags I receive in the
next few days.

Cheers,
Nathan