Re: [PATCH] ARM: Allow pre-ARMv5 builds with ld.lld 16.0.0 and newer

[Arnd Bergmann]

On Wed, Jan 18, 2023, at 20:22, Nathan Chancellor wrote:
> Commit 6a7ee50f8f56 ("ARM: disallow pre-ARMv5 builds with ld.lld")
> prevented v4 or v4t kernels when ld.lld will link the kernel due to
> inserting unsupported blx instructions.
>
> ld.lld has been fixed in current main (16.0.0) to avoid inserting these
> instructions by inserting position independent thunks instead. Allow
> these configurations to be enabled when ld.lld 16.0.0 is used to link
> the kernel.
>
> Additionally, add a link to the upstream LLVM issue so that the reason
> for this dependency is clearly documented.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/964
> Link: 
> https://github.com/llvm/llvm-project/commit/6f9ff1beee9d12aca0c9caa9ae0051dc6d0a718c
> Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>

Thanks a lot for getting this fixed!

I gave this a spin on my randconfig build setup, which showed
nothing unusual.

Tested-by: Arnd Bergmann <arnd@xxxxxxxx>

Please add this to Russell's patch tracker.

      Arnd