Re: [PATCH] arm64/module: Fix livepatch BTI exceptions with Clang 21+

Nick Desaulniers <[email protected]> Tue, 11 Aug 2026 09:17:09 -0700

Newsgroups	org.kernel.vger.live-patching,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel
Message-ID	<CAKwvOdkVxt-90Z_Af8s63RKCY-202r_0_bgF+8-g7iKn6XM_Sg@mail.gmail.com>

On Tue, Aug 11, 2026 at 6:18 AM Ard Biesheuvel <[email protected]> wrote:
>
>
> On Tue, 11 Aug 2026, at 14:02, Ard Biesheuvel wrote:
> > On Tue, 11 Aug 2026, at 11:44, Will Deacon wrote:
> >> On Mon, Aug 10, 2026 at 09:41:35AM -0700, Nick Desaulniers wrote:
> >
> >>> Sure, but let's replace this with a link to a bug report in llvm's
> >>> issue tracker?
> >>
> >> Yes, please! I can apply the patch once we have the bug number.
> >>
> >
> > I can look into that.
>
> https://github.com/llvm/llvm-project/issues/215547

Thanks.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106671 was closed as
invalid pointing to the same commit in llvm. What's going on here?
Where's the corresponding feature request for GCC?

At the least, I could imagine there being a `-fno-omit-bti-pads` or
whatever for the kernel to opt into this behavior.
-- 
Thanks,
~Nick Desaulniers