After commit 2625480a1bf7 ("hardening: Default randstruct off with rust
for better allmodconfig support"), which allows Rust to be enabled for
allmodconfig, ARCH=loongarch allmodconfig starts failing with:

  error: kernel-address sanitizer is not supported for this target

  error: aborting due to 1 previous error

  make[4]: *** [rust/Makefile:741: rust/core.o] Error 1

For the same reason as commit 84a0f7caafc6 ("ARM: Do not select
HAVE_RUST when KASAN is enabled"), do not select HAVE_RUST when KASAN is
enabled until the loongarch64-unknown-none-softfloat target in rustc
supports KASAN.

Fixes: 90868ff9cade ("LoongArch: Enable initial Rust support")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 arch/loongarch/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index a21f51e5815e..2067d1f2ad7a 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -175,7 +175,7 @@ config LOONGARCH
 	select HAVE_RELIABLE_STACKTRACE if UNWINDER_ORC
 	select HAVE_RETHOOK
 	select HAVE_RSEQ
-	select HAVE_RUST
+	select HAVE_RUST if !KASAN
 	select HAVE_SAMPLE_FTRACE_DIRECT
 	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
 	select HAVE_SETUP_PER_CPU_AREA if NUMA

---
base-commit: 940de590b839f71d6dc846160534bf202401b8b7
change-id: 20260903-loongarch-disable-rust-with-kasan-ee6ca248bf1c

Best regards,
--  
Cheers,
Nathan

On Thu, Sep 3, 2026 at 10:12 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> After commit 2625480a1bf7 ("hardening: Default randstruct off with rust
> for better allmodconfig support"), which allows Rust to be enabled for
> allmodconfig, ARCH=loongarch allmodconfig starts failing with:
>
>   error: kernel-address sanitizer is not supported for this target
>
>   error: aborting due to 1 previous error
>
>   make[4]: *** [rust/Makefile:741: rust/core.o] Error 1
>
> For the same reason as commit 84a0f7caafc6 ("ARM: Do not select
> HAVE_RUST when KASAN is enabled"), do not select HAVE_RUST when KASAN is
> enabled until the loongarch64-unknown-none-softfloat target in rustc
> supports KASAN.
>
> Fixes: 90868ff9cade ("LoongArch: Enable initial Rust support")
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Sounds good to me -- if LoongArch gives their Acked-by, then I can
take it in the rust-fixes PR I will send soon; otherwise, this can go
through their tree or Kbuild's I guess.

Thanks!

Cheers,
Miguel

On Fri, Sep 4, 2026 at 7:04 AM Miguel Ojeda
<miguel.ojeda.sandonis@gmail.com> wrote:
>
> On Thu, Sep 3, 2026 at 10:12 PM Nathan Chancellor <nathan@kernel.org> wrote:
> >
> > After commit 2625480a1bf7 ("hardening: Default randstruct off with rust
> > for better allmodconfig support"), which allows Rust to be enabled for
> > allmodconfig, ARCH=loongarch allmodconfig starts failing with:
> >
> >   error: kernel-address sanitizer is not supported for this target
> >
> >   error: aborting due to 1 previous error
> >
> >   make[4]: *** [rust/Makefile:741: rust/core.o] Error 1
> >
> > For the same reason as commit 84a0f7caafc6 ("ARM: Do not select
> > HAVE_RUST when KASAN is enabled"), do not select HAVE_RUST when KASAN is
> > enabled until the loongarch64-unknown-none-softfloat target in rustc
> > supports KASAN.
> >
> > Fixes: 90868ff9cade ("LoongArch: Enable initial Rust support")
> > Signed-off-by: Nathan Chancellor <nathan@kernel.org>
>
> Sounds good to me -- if LoongArch gives their Acked-by, then I can
> take it in the rust-fixes PR I will send soon; otherwise, this can go
> through their tree or Kbuild's I guess.
I queued for loongarch-fixes, thanks.

Huacai

>
> Thanks!
>
> Cheers,
> Miguel
>

On Fri, Sep 4, 2026 at 8:51 AM Huacai Chen <chenhuacai@kernel.org> wrote:
>
> I queued for loongarch-fixes, thanks.

Great, thanks, please feel free to add my Acked-by:

Acked-by: Miguel Ojeda <ojeda@kernel.org>

Cheers,
Miguel