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

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Date:   Tue, 27 Jul 2021 21:15:52 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Christoph Hellwig <hch@...radead.org>,
        Feng Tang <feng.tang@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v5 4/6] mm: simplify compat numa syscalls

On Tue, Jul 27, 2021 at 08:49:40PM +0200, Arnd Bergmann wrote:
> On Tue, Jul 27, 2021 at 8:38 PM Heiko Carstens <hca@...ux.ibm.com> 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.

You are remembering correctly, probably because you implemented it ;)
I totally forgot - sorry for the noise!