Re: [PATCH v5 4/6] mm: simplify compat numa syscalls

From: Arnd Bergmann
Date: Tue Jul 27 2021 - 14:50:13 EST

On Tue, Jul 27, 2021 at 8:38 PM Heiko Carstens <hca@xxxxxxxxxxxxx> wrote:
> -268 common mbind sys_mbind compat_sys_mbind
> -269 common get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy
> -270 common set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy
> +268 common mbind sys_mbind sys_mbind
> +269 common get_mempolicy sys_get_mempolicy sys_get_mempolicy
> +270 common set_mempolicy sys_set_mempolicy sys_set_mempolicy
> would remove compat_ptr() conversion from nmask above if I'm not mistaken.

Maybe I'm misremembering how compat syscalls work on s390. Doesn't
SYSCALL_DEFINEx(sys_mbind) still create two entry points __s390x_sys_mbind()
and __s390_sys_mbind() with different argument conversion (__SC_CAST vs
__SC_COMPAT_CAST)? I thought that was the whole point of the macros.