Re: GCC 15 -fzero-init-padding-bits= option and redzone clobber

On Fri, 29 Nov 2024 at 09:55, Linus Torvalds
<[email protected]> wrote:
>
> This has happened with both gcc and clang, and telling the compiler
> that we need the stack pointer fixes it. I don't actually remember who
> told us to do that, but I think it was a gcc person.
>
> In fact, if I were a betting man, I would have thought it was you ;)

Ahh, found it. Not you. Segher. Doing some archeology finds this:

    https://gcc.gnu.org/legacy-ml/gcc/2015-07/msg00080.html

and even at the time, Segher suggested maybe having a separate "stack"
clobber. But obviously that wasn't available at the time, and afaik
has never happened.

So we used that gcc suggestion, and it has worked fine for most of a
decade by now.

           Linus