Re: [linus:master] [x86/entry] be5341eb0d: WARNING:CPU:#PID:#at_int80_emulation

[Linus Torvalds]

On Tue, 19 Dec 2023 at 11:15, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>
> -asmlinkage long sys_ni_posix_timers(void);
> +asmlinkage long sys_ni_posix_timers(const struct pt_regs *regs);

I don't think it should be asmlinkage. That means "use legacy asm
calling conventions", and for x86-32 that means pass on stack. Which I
don't think these actually are.

I think it's an old artefect, and it doesn't matter for something that
doesn't take any arguments, but when you add an argument it's actively
wrong.

Of course, that argument isn't _used_, so it still doesn't matter, but
if the point is to use the right prototype, I think we should just
make it be

    long sys_ni_posix_timers(const struct pt_regs *regs);

although I think Sami's suggestion is probably nicer.

That said, I still think that just getting rid of this horrid special
case for posix timers is the right thing, and we should just remove
that SYS_NI() alias thing entirely.

          Linus