Hi Arnd,
On Wed, 11 Feb 2026 at 11:41, Geert Uytterhoeven <[email protected]> wrote:
> On Tue, 6 Jan 2026 at 16:38, Arnd Bergmann <[email protected]> wrote:
> > --- a/include/uapi/linux/rseq.h
> > +++ b/include/uapi/linux/rseq.h
> > @@ -142,9 +142,13 @@ struct rseq {
> > __u32 mm_cid;
> >
> > /*
> > - * Flexible array member at end of structure, after last feature
> > field.
> > + * Flexible array member at end of structure, after last feature
> > field,
> > + * but overlapping with the padding.
> > */
> > - char end[];
> > + union {
> > + __u32 :32;
> > + __DECLARE_FLEX_ARRAY(char, end);
> > + };
>
> After commit d6200245c75e832a ("rseq: Allow registering RSEQ with
> slice extension"), the padding must be removed again.
And after commit 3b68df978133ac3d ("rseq: slice ext: Ensure rseq
feature size differs from original rseq size"), we need (different)
padding again:
- __u32 :32;
+ __u8 pad[31];
>
> > } __attribute__((aligned(4 * sizeof(__u64))));
> >
> > #endif /* _UAPI_LINUX_RSEQ_H */
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
