linux-kernel - Re: [PATCH v2 1/2] fork: add clone3

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Date:   Tue, 4 Jun 2019 12:36:24 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Christian Brauner <christian@...uner.io>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Florian Weimer <fweimer@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        David Howells <dhowells@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Adrian Reber <adrian@...as.de>,
        Andrei Vagin <avagin@...il.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] fork: add clone3

On Mon, Jun 3, 2019 at 4:44 PM Christian Brauner <christian@...uner.io> wrote:

> +
> +#ifdef __ARCH_WANT_SYS_CLONE
> +asmlinkage long sys_clone3(struct clone_args __user *uargs, size_t size);
> +#endif

I would leave it outside of __ARCH_WANT_SYS_CLONE, as far
as I can tell the only reason for that #ifdef is so architectures that
have their own sys_clone implementation can opt out of the generic
one, but we don't want that for new syscalls.

In fact, I'd prefer to drop the symbol entirely and have a different
symbol with the opposite meaning such as
__ARCH_NONSTANDARD_SYS_CLONE that only gets
selected by sparc, ia64 and m68k. That should be a separate
patch though, and I'm not asking you to do it, unless you
want to clean up a little more.

       Arnd