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

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Date:   Thu, 30 Mar 2017 15:48:48 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Richard Henderson <rth@...ddle.net>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Vineet Gupta <vgupta@...opsys.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>,
        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 Thu, Mar 30, 2017 at 02:32:12PM +0200, Martin Schwidefsky wrote:
> On Wed, 29 Mar 2017 06:57:06 +0100
> Al Viro <viro@...IV.linux.org.uk> wrote:
> 
> > 	The patchset currently in vfs.git#work.uaccess is the result;
> > there's more work to do, but it takes care of a large part of the
> > problems.  About 2.8KLoc removed, a lot of cruft is gone and semantics
> > is hopefully in sync now.  All but two architectures (ia64 and metag)
> > had been switched to new mechanism; for these two I'm afraid that I'll
> > need serious help from maintainers.
> 
> I have tested the code in vfs.git#work.uaccess and in principle it works
> for s390. I found one bug which would return an incorrect result
> for copy_from_user if the access faults on the last page of the copy.
> In that case the new code would return 0 instead of the remaining bytes.
> 
> This patch snippet should fix it, please just merge it into commit
> "s390: get rid of zeroing, switch to RAW_COPY_USER"

Done.