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

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Date:   Thu, 2 Mar 2017 14:07:20 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     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 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>