Magnus!

On Sun, Jul 19 2026 at 13:25, Magnus Lindholm wrote:

One Alpha-specific wrinkle I hit while rebasing the GENERIC_ENTRY patch is
that Alpha cannot unconditionally pre-seed the normal -ENOSYS return state
before calling into the generic entry code: syscall_set_return_value() also
updates r19/a3, which is still syscall argument 4 on the normal entry path.
Doing that too early broke early userspace mmap() during boot.

Similar to what Peter and me suggested in the related discussion
vs. s390 which has a similar issue, you can just have a dedicated
syscall_return member in your pt_regs struct, which is preset to -ENOSYS
and operate on that. You have an unused padding entry there which means
it won't even change the size.

Are you planning to send a v2 with the seccomp recheck fix and any other
review fixups folded in? Is the intention to route this upstream
during the next merge window?

You were on CC for the V2, no?

The whole pile including Jinjie's seccomp bypass fix is in

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/entry

and is targeted for the 7.3 merge window.

If you want to base your stuff on that for 7.3, I can add a tag which
makes it immutable so it can be pulled into the alpha tree.

Thanks,

        tglx