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SubjectRe: mainline build failure of powerpc allmodconfig for prom_init_check
On Sun, Jul 17, 2022 at 01:29:07PM -0700, Linus Torvalds wrote:
> On Sun, Jul 17, 2022 at 1:25 PM Sudip Mukherjee
> <sudipm.mukherjee@gmail.com> wrote:
> >
> > And the generated assembly still has the memset for "struct prom_args".
>
> Strange. That smells like a compiler bug to me.
>
> But I can't read powerpc assembly code - it's been too many years, and
> even back when I did read it I hated how the register "names" worked.
>
> Maybe it was never the args array, and it was about the other fields.
> Not that that makes any sense either, but it makes more sense than the
> compiler turning a series of volatile accesses into a memset.

Calling mem* on a volatile object (or a struct containing one) is not
valid. I opened gcc.gnu.org/PR106335. Thanks for bringing this up!


Segher

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