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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