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    SubjectRe: [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

    ---
    0-DAY kernel test infrastructure Open Source Technology Center
    https://lists.01.org/pipermail/kbuild-all Intel Corporation
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