linux-kernel - Re: [PATCH 1/3] futex: remove duplicated code

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Date:   Fri, 3 Mar 2017 09:48:52 -0500
From:   Chris Metcalf <cmetcalf@...lanox.com>
To:     Jiri Slaby <jslaby@...e.cz>, <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        "Ivan Kokshaysky" <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Richard Kuo <rkuo@...eaurora.org>,
        Tony Luck <tony.luck@...el.com>,
        "Fenghua Yu" <fenghua.yu@...el.com>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Arnd Bergmann <arnd@...db.de>, <x86@...nel.org>,
        <linux-alpha@...r.kernel.org>,
        <linux-snps-arc@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-hexagon@...r.kernel.org>, <linux-ia64@...r.kernel.org>,
        <linux-mips@...ux-mips.org>, <openrisc@...ts.librecores.org>,
        <linux-parisc@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-s390@...r.kernel.org>, <linux-sh@...r.kernel.org>,
        <sparclinux@...r.kernel.org>, <linux-xtensa@...ux-xtensa.org>,
        <linux-arch@...r.kernel.org>
Subject: Re: [PATCH 1/3] futex: remove duplicated code

On 3/3/2017 7:27 AM, Jiri Slaby wrote:
> There is code duplicated over all architecture's headers for
> futex_atomic_op_inuser. Namely op decoding, access_ok check for uaddr,
> and comparison of the result.
>
> Remove this duplication and leave up to the arches only the needed
> assembly which is now in arch_futex_atomic_op_inuser.
>
> Note that s390 removed access_ok check in d12a29703 ("s390/uaccess:
> remove pointless access_ok() checks") as access_ok there returns true.
> We introduce it back to the helper for the sake of simplicity (it gets
> optimized away anyway).
>
> Signed-off-by: Jiri Slaby<jslaby@...e.cz>

Acked-by: Chris Metcalf <cmetcalf@...lanox.com> [for tile]

-- 
Chris Metcalf, Mellanox Technologies
http://www.mellanox.com