Re: [linux-next:master 14191/14955] vmlinux.o: error: objtool: amdgpu_vm_handle_fault+0x186: sibling call from callable instruction with modified stack frame

[Mikhail Gavrilov]

On Wed, Jun 24, 2026 at 2:28 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> I do think this is very much a compiler issue, clang should never emit
> an indirect call for this. Doing that is just aweful.

Filed upstream as https://github.com/llvm/llvm-project/issues/205544
with a standalone reproducer (the drm_exec computed-goto pattern reduced
to one .c file; plain -O2, no LTO and no KASAN needed). clang lowers the
single-target computed goto to jmp *%reg; gcc folds the same source to a
direct jmp. So the missed fold is tracked on the LLVM side regardless of
the drm_exec.h rework happening here.

I have the KASAN + ThinLTO + clang config that triggered the original
objtool warning, so I can give a Tested-by once the drm_exec.h change
settles.

-- 
Thanks,
Mikhail.