linux-kernel - Re: [PATCH v2 1/5] lib: add bitrev8x4()

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Date:   Sat, 29 Oct 2016 02:50:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Joshua Clayton <stillcompiling@...il.com>
Cc:     kbuild-all@...org, Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Russell King <linux@...linux.org.uk>,
        Joshua Clayton <stillcompiling@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/5] lib: add bitrev8x4()

Hi Joshua,

[auto build test WARNING on linus/master]
[also build test WARNING on v4.9-rc2 next-20161028]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Joshua-Clayton/lib-add-bitrev8x4/20161029-012535
config: arm-s5pv210_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All warnings (new ones prefixed by >>):

   In file included from include/linux/bitrev.h:7:0,
                    from include/linux/crc32.h:9,
                    from lib/crc32.c:29:
   arch/arm/include/asm/bitrev.h: In function '__arch_bitrev8x4':
>> arch/arm/include/asm/bitrev.h:23:1: warning: no return statement in function returning non-void [-Wreturn-type]
    }
    ^

vim +23 arch/arm/include/asm/bitrev.h

     7		return x;
     8	}
     9	
    10	static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)
    11	{
    12		return __arch_bitrev32((u32)x) >> 16;
    13	}
    14	
    15	static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
    16	{
    17		return __arch_bitrev32((u32)x) >> 24;
    18	}
    19	
    20	static __always_inline __attribute_const__ u32 __arch_bitrev8x4(u32 x)
    21	{
    22		__asm__ ("rbit %0, %1; rev %0, %0" : "=r" (x) : "r" (x));
  > 23	}
    24	
    25	#endif

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