linux-kernel - Re: [RFC][CFT][PATCHSET v1] uaccess unification

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Message-ID: <CA+55aFyEQ_naUW6Q+qVoBA24bgBh1=2H+V54k501uV2pKFv+nw@mail.gmail.com>
Date:   Wed, 29 Mar 2017 14:24:37 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Steven Miao <realmz6@...il.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Mark Salter <msalter@...hat.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Richard Kuo <rkuo@...eaurora.org>,
        Tony Luck <tony.luck@...el.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        James Hogan <james.hogan@...tec.com>,
        Michal Simek <monstr@...str.eu>,
        David Howells <dhowells@...hat.com>,
        Ley Foon Tan <lftan@...era.com>,
        Jonas Bonn <jonas@...thpole.se>, Helge Deller <deller@....de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chen Liqin <liqin.linux@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Richard Weinberger <richard@....at>,
        Guan Xuetao <gxt@...c.pku.edu.cn>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chris Zankel <chris@...kel.net>
Subject: Re: [RFC][CFT][PATCHSET v1] uaccess unification

On Wed, Mar 29, 2017 at 2:03 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> it's not as if having the possibility to inline them
> would really complicate the generic side of things...

I disagree.

I think one of the biggest problems with our current uaccess.h mess is
just how illegible the header files are, and the
INLINE_COPY_{TO,FROM}_USER thing is not helping.

I think it would be much better if the header file just had

 extern unsigned long _copy_from_user(void *, const void __user *,
unsigned long);

and nothing else. No unnecessary noise.

The same goes for things like [__]copy_in_user() - why is that thing
still inlined? If it was a *macro*, it might be useful due to the
might_fault() thing giving the caller information, but that's not even
the case here, so we'd actually be much better off without any of that
inlining stuff. Do it all in lib/usercopy.c, and move the
might_fault() in there too.

                Linus