Hi Matthew, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on drm-tip/drm-tip v5.11-rc5 next-20210122] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Matthew-Auld/drm-i915-buddy-document-the-unused-header-bits/20210125-111101 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: i386-randconfig-a012-20210125 (attached as .config) compiler: gcc-9 (Debian 9.3.0-20) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/9d12a23788459bd678c0f5979acaaf94a88d808c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthew-Auld/drm-i915-buddy-document-the-unused-header-bits/20210125-111101 git checkout 9d12a23788459bd678c0f5979acaaf94a88d808c # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from include/asm-generic/bug.h:5, from arch/x86/include/asm/bug.h:93, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from include/linux/kmemleak.h:12, from drivers/gpu/drm/i915/i915_buddy.c:6: drivers/gpu/drm/i915/selftests/i915_buddy.c: In function 'igt_buddy_alloc_limit': >> include/linux/log2.h:194:8: warning: left shift count >= width of type [-Wshift-count-overflow] 194 | (1UL << ilog2(n))) : \ | ^~ include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var' 58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond)) | ^~~~ drivers/gpu/drm/i915/selftests/i915_buddy.c:761:2: note: in expansion of macro 'if' 761 | if (i915_buddy_block_size(&mm, block) != rounddown_pow_of_two(size)) { | ^~ drivers/gpu/drm/i915/selftests/i915_buddy.c:761:43: note: in expansion of macro 'rounddown_pow_of_two' 761 | if (i915_buddy_block_size(&mm, block) != rounddown_pow_of_two(size)) { | ^~~~~~~~~~~~~~~~~~~~ >> include/linux/log2.h:194:8: warning: left shift count >= width of type [-Wshift-count-overflow] 194 | (1UL << ilog2(n))) : \ | ^~ include/linux/compiler.h:69:3: note: in definition of macro '__trace_if_value' 69 | (cond) ? \ | ^~~~ include/linux/compiler.h:56:28: note: in expansion of macro '__trace_if_var' 56 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) ) | ^~~~~~~~~~~~~~ drivers/gpu/drm/i915/selftests/i915_buddy.c:761:2: note: in expansion of macro 'if' 761 | if (i915_buddy_block_size(&mm, block) != rounddown_pow_of_two(size)) { | ^~ drivers/gpu/drm/i915/selftests/i915_buddy.c:761:43: note: in expansion of macro 'rounddown_pow_of_two' 761 | if (i915_buddy_block_size(&mm, block) != rounddown_pow_of_two(size)) { | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kernel.h:12, from include/asm-generic/bug.h:20, from arch/x86/include/asm/bug.h:93, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/slab.h:15, from include/linux/kmemleak.h:12, from drivers/gpu/drm/i915/i915_buddy.c:6: >> include/linux/log2.h:194:8: warning: left shift count >= width of type [-Wshift-count-overflow] 194 | (1UL << ilog2(n))) : \ | ^~ include/linux/printk.h:343:33: note: in expansion of macro 'rounddown_pow_of_two' 343 | printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~ drivers/gpu/drm/i915/selftests/i915_buddy.c:762:3: note: in expansion of macro 'pr_err' 762 | pr_err("block size(%llu) != %lu\n", | ^~~~~~ vim +194 include/linux/log2.h b311e921b385b5a Robert P. J. Day 2007-10-16 69 f0d1b0b30d250a0 David Howells 2006-12-08 70 /** dbef91ec5482239 Martin Wilck 2018-04-18 71 * const_ilog2 - log base 2 of 32-bit or a 64-bit constant unsigned value a1c4d24e02d093e Randy Dunlap 2017-09-30 72 * @n: parameter f0d1b0b30d250a0 David Howells 2006-12-08 73 * dbef91ec5482239 Martin Wilck 2018-04-18 74 * Use this where sparse expects a true constant expression, e.g. for array dbef91ec5482239 Martin Wilck 2018-04-18 75 * indices. f0d1b0b30d250a0 David Howells 2006-12-08 76 */ dbef91ec5482239 Martin Wilck 2018-04-18 77 #define const_ilog2(n) \ f0d1b0b30d250a0 David Howells 2006-12-08 78 ( \ f0d1b0b30d250a0 David Howells 2006-12-08 79 __builtin_constant_p(n) ? ( \ 474c90156c8dcc2 Linus Torvalds 2017-03-02 80 (n) < 2 ? 0 : \ f0d1b0b30d250a0 David Howells 2006-12-08 81 (n) & (1ULL << 63) ? 63 : \ f0d1b0b30d250a0 David Howells 2006-12-08 82 (n) & (1ULL << 62) ? 62 : \ f0d1b0b30d250a0 David Howells 2006-12-08 83 (n) & (1ULL << 61) ? 61 : \ f0d1b0b30d250a0 David Howells 2006-12-08 84 (n) & (1ULL << 60) ? 60 : \ f0d1b0b30d250a0 David Howells 2006-12-08 85 (n) & (1ULL << 59) ? 59 : \ f0d1b0b30d250a0 David Howells 2006-12-08 86 (n) & (1ULL << 58) ? 58 : \ f0d1b0b30d250a0 David Howells 2006-12-08 87 (n) & (1ULL << 57) ? 57 : \ f0d1b0b30d250a0 David Howells 2006-12-08 88 (n) & (1ULL << 56) ? 56 : \ f0d1b0b30d250a0 David Howells 2006-12-08 89 (n) & (1ULL << 55) ? 55 : \ f0d1b0b30d250a0 David Howells 2006-12-08 90 (n) & (1ULL << 54) ? 54 : \ f0d1b0b30d250a0 David Howells 2006-12-08 91 (n) & (1ULL << 53) ? 53 : \ f0d1b0b30d250a0 David Howells 2006-12-08 92 (n) & (1ULL << 52) ? 52 : \ f0d1b0b30d250a0 David Howells 2006-12-08 93 (n) & (1ULL << 51) ? 51 : \ f0d1b0b30d250a0 David Howells 2006-12-08 94 (n) & (1ULL << 50) ? 50 : \ f0d1b0b30d250a0 David Howells 2006-12-08 95 (n) & (1ULL << 49) ? 49 : \ f0d1b0b30d250a0 David Howells 2006-12-08 96 (n) & (1ULL << 48) ? 48 : \ f0d1b0b30d250a0 David Howells 2006-12-08 97 (n) & (1ULL << 47) ? 47 : \ f0d1b0b30d250a0 David Howells 2006-12-08 98 (n) & (1ULL << 46) ? 46 : \ f0d1b0b30d250a0 David Howells 2006-12-08 99 (n) & (1ULL << 45) ? 45 : \ f0d1b0b30d250a0 David Howells 2006-12-08 100 (n) & (1ULL << 44) ? 44 : \ f0d1b0b30d250a0 David Howells 2006-12-08 101 (n) & (1ULL << 43) ? 43 : \ f0d1b0b30d250a0 David Howells 2006-12-08 102 (n) & (1ULL << 42) ? 42 : \ f0d1b0b30d250a0 David Howells 2006-12-08 103 (n) & (1ULL << 41) ? 41 : \ f0d1b0b30d250a0 David Howells 2006-12-08 104 (n) & (1ULL << 40) ? 40 : \ f0d1b0b30d250a0 David Howells 2006-12-08 105 (n) & (1ULL << 39) ? 39 : \ f0d1b0b30d250a0 David Howells 2006-12-08 106 (n) & (1ULL << 38) ? 38 : \ f0d1b0b30d250a0 David Howells 2006-12-08 107 (n) & (1ULL << 37) ? 37 : \ f0d1b0b30d250a0 David Howells 2006-12-08 108 (n) & (1ULL << 36) ? 36 : \ f0d1b0b30d250a0 David Howells 2006-12-08 109 (n) & (1ULL << 35) ? 35 : \ f0d1b0b30d250a0 David Howells 2006-12-08 110 (n) & (1ULL << 34) ? 34 : \ f0d1b0b30d250a0 David Howells 2006-12-08 111 (n) & (1ULL << 33) ? 33 : \ f0d1b0b30d250a0 David Howells 2006-12-08 112 (n) & (1ULL << 32) ? 32 : \ f0d1b0b30d250a0 David Howells 2006-12-08 113 (n) & (1ULL << 31) ? 31 : \ f0d1b0b30d250a0 David Howells 2006-12-08 114 (n) & (1ULL << 30) ? 30 : \ f0d1b0b30d250a0 David Howells 2006-12-08 115 (n) & (1ULL << 29) ? 29 : \ f0d1b0b30d250a0 David Howells 2006-12-08 116 (n) & (1ULL << 28) ? 28 : \ f0d1b0b30d250a0 David Howells 2006-12-08 117 (n) & (1ULL << 27) ? 27 : \ f0d1b0b30d250a0 David Howells 2006-12-08 118 (n) & (1ULL << 26) ? 26 : \ f0d1b0b30d250a0 David Howells 2006-12-08 119 (n) & (1ULL << 25) ? 25 : \ f0d1b0b30d250a0 David Howells 2006-12-08 120 (n) & (1ULL << 24) ? 24 : \ f0d1b0b30d250a0 David Howells 2006-12-08 121 (n) & (1ULL << 23) ? 23 : \ f0d1b0b30d250a0 David Howells 2006-12-08 122 (n) & (1ULL << 22) ? 22 : \ f0d1b0b30d250a0 David Howells 2006-12-08 123 (n) & (1ULL << 21) ? 21 : \ f0d1b0b30d250a0 David Howells 2006-12-08 124 (n) & (1ULL << 20) ? 20 : \ f0d1b0b30d250a0 David Howells 2006-12-08 125 (n) & (1ULL << 19) ? 19 : \ f0d1b0b30d250a0 David Howells 2006-12-08 126 (n) & (1ULL << 18) ? 18 : \ f0d1b0b30d250a0 David Howells 2006-12-08 127 (n) & (1ULL << 17) ? 17 : \ f0d1b0b30d250a0 David Howells 2006-12-08 128 (n) & (1ULL << 16) ? 16 : \ f0d1b0b30d250a0 David Howells 2006-12-08 129 (n) & (1ULL << 15) ? 15 : \ f0d1b0b30d250a0 David Howells 2006-12-08 130 (n) & (1ULL << 14) ? 14 : \ f0d1b0b30d250a0 David Howells 2006-12-08 131 (n) & (1ULL << 13) ? 13 : \ f0d1b0b30d250a0 David Howells 2006-12-08 132 (n) & (1ULL << 12) ? 12 : \ f0d1b0b30d250a0 David Howells 2006-12-08 133 (n) & (1ULL << 11) ? 11 : \ f0d1b0b30d250a0 David Howells 2006-12-08 134 (n) & (1ULL << 10) ? 10 : \ f0d1b0b30d250a0 David Howells 2006-12-08 135 (n) & (1ULL << 9) ? 9 : \ f0d1b0b30d250a0 David Howells 2006-12-08 136 (n) & (1ULL << 8) ? 8 : \ f0d1b0b30d250a0 David Howells 2006-12-08 137 (n) & (1ULL << 7) ? 7 : \ f0d1b0b30d250a0 David Howells 2006-12-08 138 (n) & (1ULL << 6) ? 6 : \ f0d1b0b30d250a0 David Howells 2006-12-08 139 (n) & (1ULL << 5) ? 5 : \ f0d1b0b30d250a0 David Howells 2006-12-08 140 (n) & (1ULL << 4) ? 4 : \ f0d1b0b30d250a0 David Howells 2006-12-08 141 (n) & (1ULL << 3) ? 3 : \ f0d1b0b30d250a0 David Howells 2006-12-08 142 (n) & (1ULL << 2) ? 2 : \ 474c90156c8dcc2 Linus Torvalds 2017-03-02 143 1) : \ dbef91ec5482239 Martin Wilck 2018-04-18 144 -1) dbef91ec5482239 Martin Wilck 2018-04-18 145 dbef91ec5482239 Martin Wilck 2018-04-18 146 /** dbef91ec5482239 Martin Wilck 2018-04-18 147 * ilog2 - log base 2 of 32-bit or a 64-bit unsigned value dbef91ec5482239 Martin Wilck 2018-04-18 148 * @n: parameter dbef91ec5482239 Martin Wilck 2018-04-18 149 * dbef91ec5482239 Martin Wilck 2018-04-18 150 * constant-capable log of base 2 calculation dbef91ec5482239 Martin Wilck 2018-04-18 151 * - this can be used to initialise global variables from constant data, hence dbef91ec5482239 Martin Wilck 2018-04-18 152 * the massive ternary operator construction dbef91ec5482239 Martin Wilck 2018-04-18 153 * dbef91ec5482239 Martin Wilck 2018-04-18 154 * selects the appropriately-sized optimised version depending on sizeof(n) dbef91ec5482239 Martin Wilck 2018-04-18 155 */ dbef91ec5482239 Martin Wilck 2018-04-18 156 #define ilog2(n) \ dbef91ec5482239 Martin Wilck 2018-04-18 157 ( \ dbef91ec5482239 Martin Wilck 2018-04-18 158 __builtin_constant_p(n) ? \ 2f78788b55baa34 Jakub Jelinek 2020-12-15 159 ((n) < 2 ? 0 : \ 2f78788b55baa34 Jakub Jelinek 2020-12-15 160 63 - __builtin_clzll(n)) : \ f0d1b0b30d250a0 David Howells 2006-12-08 161 (sizeof(n) <= 4) ? \ f0d1b0b30d250a0 David Howells 2006-12-08 162 __ilog2_u32(n) : \ f0d1b0b30d250a0 David Howells 2006-12-08 163 __ilog2_u64(n) \ f0d1b0b30d250a0 David Howells 2006-12-08 164 ) f0d1b0b30d250a0 David Howells 2006-12-08 165 312a0c170945b49 David Howells 2006-12-08 166 /** 312a0c170945b49 David Howells 2006-12-08 167 * roundup_pow_of_two - round the given value up to nearest power of two a1c4d24e02d093e Randy Dunlap 2017-09-30 168 * @n: parameter 312a0c170945b49 David Howells 2006-12-08 169 * 6fb189c2a4f3bea Robert P. J. Day 2007-02-17 170 * round the given value up to the nearest power of two 312a0c170945b49 David Howells 2006-12-08 171 * - the result is undefined when n == 0 312a0c170945b49 David Howells 2006-12-08 172 * - this can be used to initialise global variables from constant data 312a0c170945b49 David Howells 2006-12-08 173 */ 312a0c170945b49 David Howells 2006-12-08 174 #define roundup_pow_of_two(n) \ 312a0c170945b49 David Howells 2006-12-08 175 ( \ 312a0c170945b49 David Howells 2006-12-08 176 __builtin_constant_p(n) ? ( \ 428fc0aff4e5939 Jason Gunthorpe 2020-09-04 177 ((n) == 1) ? 1 : \ 312a0c170945b49 David Howells 2006-12-08 178 (1UL << (ilog2((n) - 1) + 1)) \ 312a0c170945b49 David Howells 2006-12-08 179 ) : \ 312a0c170945b49 David Howells 2006-12-08 180 __roundup_pow_of_two(n) \ 312a0c170945b49 David Howells 2006-12-08 181 ) 312a0c170945b49 David Howells 2006-12-08 182 b311e921b385b5a Robert P. J. Day 2007-10-16 183 /** b311e921b385b5a Robert P. J. Day 2007-10-16 184 * rounddown_pow_of_two - round the given value down to nearest power of two a1c4d24e02d093e Randy Dunlap 2017-09-30 185 * @n: parameter b311e921b385b5a Robert P. J. Day 2007-10-16 186 * b311e921b385b5a Robert P. J. Day 2007-10-16 187 * round the given value down to the nearest power of two b311e921b385b5a Robert P. J. Day 2007-10-16 188 * - the result is undefined when n == 0 b311e921b385b5a Robert P. J. Day 2007-10-16 189 * - this can be used to initialise global variables from constant data b311e921b385b5a Robert P. J. Day 2007-10-16 190 */ b311e921b385b5a Robert P. J. Day 2007-10-16 191 #define rounddown_pow_of_two(n) \ b311e921b385b5a Robert P. J. Day 2007-10-16 192 ( \ b311e921b385b5a Robert P. J. Day 2007-10-16 193 __builtin_constant_p(n) ? ( \ b311e921b385b5a Robert P. J. Day 2007-10-16 @194 (1UL << ilog2(n))) : \ b311e921b385b5a Robert P. J. Day 2007-10-16 195 __rounddown_pow_of_two(n) \ b311e921b385b5a Robert P. J. Day 2007-10-16 196 ) b311e921b385b5a Robert P. J. Day 2007-10-16 197 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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