Hi Wenyou, I love your patch! Perhaps something to improve: [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v4.14-rc7 next-20171018] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Wenyou-Yang/media-i2c-Add-the-ov7740-image-sensor-driver/20171030-140347 base: git://linuxtv.org/media_tree.git master config: blackfin-allyesconfig (attached as .config) compiler: bfin-uclinux-gcc (GCC) 6.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=blackfin Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from drivers/media//i2c/ov7740.c:21:0: drivers/media//i2c/ov7740.c: In function 'ov7740_set_ctrl': >> include/linux/regmap.h:73:2: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] regmap_update_bits_base(map, reg, mask, val, NULL, false, false) ^~~~~~~~~~~~~~~~~~~~~~~ drivers/media//i2c/ov7740.c:512:5: note: 'val' was declared here u8 val; ^~~ -- In file included from drivers/media/i2c/ov7740.c:21:0: drivers/media/i2c/ov7740.c: In function 'ov7740_set_ctrl': >> include/linux/regmap.h:73:2: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized] regmap_update_bits_base(map, reg, mask, val, NULL, false, false) ^~~~~~~~~~~~~~~~~~~~~~~ drivers/media/i2c/ov7740.c:512:5: note: 'val' was declared here u8 val; ^~~ vim +/val +73 include/linux/regmap.h 8019ff6cf Nariman Poushin 2015-07-16 71 ca7a94464 Kuninori Morimoto 2016-02-15 72 #define regmap_update_bits(map, reg, mask, val) \ ca7a94464 Kuninori Morimoto 2016-02-15 @73 regmap_update_bits_base(map, reg, mask, val, NULL, false, false) 30ed9cb7a Kuninori Morimoto 2016-02-15 74 #define regmap_update_bits_async(map, reg, mask, val)\ 30ed9cb7a Kuninori Morimoto 2016-02-15 75 regmap_update_bits_base(map, reg, mask, val, NULL, true, false) 98c2dc486 Kuninori Morimoto 2016-02-15 76 #define regmap_update_bits_check(map, reg, mask, val, change)\ 98c2dc486 Kuninori Morimoto 2016-02-15 77 regmap_update_bits_base(map, reg, mask, val, change, false, false) 89d8d4b83 Kuninori Morimoto 2016-02-15 78 #define regmap_update_bits_check_async(map, reg, mask, val, change)\ 89d8d4b83 Kuninori Morimoto 2016-02-15 79 regmap_update_bits_base(map, reg, mask, val, change, true, false) ca7a94464 Kuninori Morimoto 2016-02-15 80 :::::: The code at line 73 was first introduced by commit :::::: ca7a94464b5457a8dc5add19f6fc3bea59d6193f regmap: merge regmap_update_bits() into macro :::::: TO: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx> :::::: CC: Mark Brown <broonie@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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