Re: [PATCH 5.15 0/5] Support static calls with LLVM-built kernels

Thadeu Lima de Souza Cascardo
2024-03-16T10:02:33Z

On Sat, Mar 16, 2024 at 05:41:16AM -0400, Sasha Levin wrote:
> On Wed, Mar 13, 2024 at 07:42:50AM -0300, Thadeu Lima de Souza Cascardo wrote:
> > Peter Zijlstra (4):
> > arch: Introduce CONFIG_FUNCTION_ALIGNMENT
> > x86/alternatives: Introduce int3_emulate_jcc()
> > x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions
> > x86/static_call: Add support for Jcc tail-calls
> >
> > Thomas Gleixner (1):
> > x86/asm: Differentiate between code and function alignment
>
> Is this not an issue on 6.1? I don't see d49a0626216b ("arch: Introduce
> CONFIG_FUNCTION_ALIGNMENT") in that tree.
>
> --
> Thanks,
> Sasha

The fix is really the last patch, 923510c88d2b ("x86/static_call: Add support
for Jcc tail-calls"). I see that 6.1 got 3,4,5:

9d80f3e60043 x86/static_call: Add support for Jcc tail-calls
c51a456b4179 x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions
75c066485bcb x86/alternatives: Introduce int3_emulate_jcc()

I can resubmit the series without the first two patches if that is preferred.

Thanks.
Cascardo.