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Sun, 15 Dec 2024 14:45:42 +0000 Date: Sun, 15 Dec 2024 22:45:33 +0800 From: Philip Li To: kernel test robot CC: Mauro Carvalho Chehab , , , , Jonathan Corbet Subject: Re: lib/hweight.c:14: warning: expecting prototype for hweightN(). 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Prototype was for __sw_hweight32() instead > > > vim +14 lib/hweight.c > > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 5 > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 6 /** > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 7 * hweightN - returns the hamming weight of a N-bit word > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 8 * @x: the word to weigh > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 9 * > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 10 * The Hamming Weight of a number is the total number of bits set in it. > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 11 */ > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 12 > d61931d89be5063 Borislav Petkov 2010-03-05 13 unsigned int __sw_hweight32(unsigned int w) > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 @14 { > 72d931046030beb Linus Torvalds 2014-09-13 15 #ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER > 39d997b514e12d5 Akinobu Mita 2009-12-21 16 w -= (w >> 1) & 0x55555555; > 39d997b514e12d5 Akinobu Mita 2009-12-21 17 w = (w & 0x33333333) + ((w >> 2) & 0x33333333); > 39d997b514e12d5 Akinobu Mita 2009-12-21 18 w = (w + (w >> 4)) & 0x0f0f0f0f; > 39d997b514e12d5 Akinobu Mita 2009-12-21 19 return (w * 0x01010101) >> 24; > 39d997b514e12d5 Akinobu Mita 2009-12-21 20 #else > f9b4192923fa6e3 Akinobu Mita 2006-03-26 21 unsigned int res = w - ((w >> 1) & 0x55555555); > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 22 res = (res & 0x33333333) + ((res >> 2) & 0x33333333); > f9b4192923fa6e3 Akinobu Mita 2006-03-26 23 res = (res + (res >> 4)) & 0x0F0F0F0F; > f9b4192923fa6e3 Akinobu Mita 2006-03-26 24 res = res + (res >> 8); > f9b4192923fa6e3 Akinobu Mita 2006-03-26 25 return (res + (res >> 16)) & 0x000000FF; > 39d997b514e12d5 Akinobu Mita 2009-12-21 26 #endif > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 27 } > d61931d89be5063 Borislav Petkov 2010-03-05 28 EXPORT_SYMBOL(__sw_hweight32); > 3b9ed1a5d2d121f Akinobu Mita 2006-03-26 29 > > :::::: The code at line 14 was first introduced by commit > :::::: 3b9ed1a5d2d121f32d2cb4f2b05f1fc57c99c946 [PATCH] bitops: generic hweight{64,32,16,8}() > > :::::: TO: Akinobu Mita > :::::: CC: Linus Torvalds > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki >