linux-kernel - Re: [PATCH 00/11] Introduce kernel_clone(), kill _do

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Message-ID: <20200818174447.GV17456@casper.infradead.org>
Date:   Tue, 18 Aug 2020 18:44:47 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Christoph Hewllig <hch@...radead.org>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Arnd Bergmann <arnd@...db.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Stafford Horne <shorne@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kars de Jong <jongk@...ux-m68k.org>,
        Kees Cook <keescook@...omium.org>,
        Greentime Hu <green.hu@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Xiao Yang <yangx.jy@...fujitsu.com>, linux-doc@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, sparclinux@...r.kernel.org,
        kgdb-bugreport@...ts.sourceforge.net,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 00/11] Introduce kernel_clone(), kill _do_fork()

On Tue, Aug 18, 2020 at 07:34:00PM +0200, Christian Brauner wrote:
> The only remaining function callable outside of kernel/fork.c is
> _do_fork(). It doesn't really follow the naming of kernel-internal
> syscall helpers as Christoph righly pointed out. Switch all callers and
> references to kernel_clone() and remove _do_fork() once and for all.

My only concern is around return type.  long, int, pid_t ... can we
choose one and stick to it?  pid_t is probably the right return type
within the kernel, despite the return type of clone3().  It'll save us
some work if we ever go through the hassle of growing pid_t beyond 31-bit.