netdev - Re: [PATCH 8/9] mm: remove compat_process_vm

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Date:   Fri, 18 Sep 2020 15:48:35 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        David Howells <dhowells@...hat.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <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-block <linux-block@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        linux-aio <linux-aio@...ck.org>, io-uring@...r.kernel.org,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Networking <netdev@...r.kernel.org>, keyrings@...r.kernel.org,
        LSM List <linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 8/9] mm: remove compat_process_vm_{readv,writev}

On Fri, Sep 18, 2020 at 2:45 PM Christoph Hellwig <hch@....de> wrote:
>
> Now that import_iovec handles compat iovecs, the native syscalls
> can be used for the compat case as well.
>
> diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c
> index a4840b9d50ad14..f2fe0a33bcfdd5 100644
> --- a/arch/x86/entry/syscall_x32.c
> +++ b/arch/x86/entry/syscall_x32.c
> @@ -17,6 +17,8 @@
>  #define __x32_sys_getsockopt   __x64_sys_getsockopt
>  #define __x32_sys_setsockopt   __x64_sys_setsockopt
>  #define __x32_sys_vmsplice     __x64_sys_vmsplice
> +#define __x32_sys_process_vm_readv     __x64_sys_process_vm_readv
> +#define __x32_sys_process_vm_writev    __x64_sys_process_vm_writev
>
>  #define __SYSCALL_64(nr, sym)
>

I forgot this hack existed, and just sent a patch with subject "x86: add
__X32_COND_SYSCALL() macro" instead.

If I understand this right, the macros above should no longer be needed
once my patch gets merged.

        Arnd