Re: mainline build failure of powerpc allmodconfig for prom_init_check

[Sudip Mukherjee]

On Sun, Jul 17, 2022 at 9:29 PM Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Sun, Jul 17, 2022 at 1:25 PM Sudip Mukherjee
> <sudipm.mukherjee@xxxxxxxxx> wrote:
> >
> > And the generated assembly still has the memset for "struct prom_args".
>
> Strange. That smells like a compiler bug to me.

Both gcc-12 and clang gives this error.

>
> 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.

I have also tried adding volatile to all the members of that struct.  :(


-- 
Regards
Sudip