linux-kernel - Re: [PATCH] uapi: fix another asm/shmbuf.h userspace compilation error

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Message-ID: <20170804152203.GA31455@jhogan-linux.le.imgtec.org>
Date:   Fri, 4 Aug 2017 16:22:04 +0100
From:   James Hogan <james.hogan@...tec.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     "Dmitry V. Levin" <ldv@...linux.org>, <linux-mips@...ux-mips.org>,
        <linux-ia64@...r.kernel.org>, <linux-xtensa@...ux-xtensa.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Howells <dhowells@...hat.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        "H. Peter Anvin" <hpa@...or.com>, <sparclinux@...r.kernel.org>,
        Hans-Christian Egtvedt <egtvedt@...fundet.no>,
        linux-arch <linux-arch@...r.kernel.org>,
        <linux-s390@...r.kernel.org>, <linux-am33-list@...hat.com>,
        <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Haavard Skinnemoen <hskinnemoen@...il.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chris Zankel <chris@...kel.net>,
        Tony Luck <tony.luck@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        <linux-alpha@...r.kernel.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        <linuxppc-dev@...ts.ozlabs.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] uapi: fix another asm/shmbuf.h userspace compilation
 error

On Thu, Mar 02, 2017 at 02:07:20PM +0100, Arnd Bergmann wrote:
> On Thu, Mar 2, 2017 at 1:46 AM, Dmitry V. Levin <ldv@...linux.org> wrote:
> > Replace size_t with __kernel_size_t to fix asm/shmbuf.h userspace
> > compilation errors like this:
> >
> > /usr/include/asm-generic/shmbuf.h:28:2: error: unknown type name 'size_t'
> >   size_t   shm_segsz; /* size of segment (bytes) */
> >
> > x32 is the only architecture where sizeof(size_t) is less than
> > sizeof(__kernel_size_t), but as the kernel treats shm_segsz field as
> > __kernel_size_t anyway, UAPI should follow.  Thanks to little-endiannes
> > of x32 and 64-bit alignment of the field following shm_segsz, this
> > change doesn't break ABI, and the difference doesn't manifest itself
> > easily.
> >
> > Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> 
> Acked-by: Arnd Bergmann <arnd@...db.de>

Out of interest, is there a plan for merging these patches from Dmitry?

Cheers
James

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