> drivers/gpu/drm/i915/display/intel_backlight.c: In function 'scale': I think this has been reported before. The 'problem' is in drivers/gpu/drm/i915/display/intel_backlight.c The compiler is inlining functions enough to detect a call to clamp() with min > max. The error isn't obvious and even the full compiler output doesn't say where 'scale' is being inlined from so it is hard to see why there is a problem. I'm not in a position to rerun the failing build. Probably needs rerunning with the lines commented out one by one to see which is responsible. David > -----Original Message----- > From: kernel test robot <lkp@xxxxxxxxx> > Sent: 10 December 2024 01:07 > To: David Laight <David.Laight@xxxxxxxxxx> > Cc: oe-kbuild-all@xxxxxxxxxxxxxxx; Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>; Linux Memory Management > List <linux-mm@xxxxxxxxx> > Subject: [linux-next:master 2241/2462] include/linux/compiler_types.h:542:45: error: call to > '__compiletime_assert_413' declared with attribute error: clamp() low limit source_min greater than > high limit source_max > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: d1486dca38afd08ca279ae94eb3a397f10737824 > commit: 58febb0202b31e9e8d55a603a70f7f131455ef2f [2241/2462] minmax.h: use BUILD_BUG_ON_MSG() for the > lo < hi test in clamp() > config: parisc-allmodconfig (https://download.01.org/0day-ci/archive/20241210/202412100848.HfPEKlvV- > lkp@xxxxxxxxx/config) > compiler: hppa-linux-gcc (GCC) 14.2.0 > reproduce (this is a W=1 build): (https://download.01.org/0day- > ci/archive/20241210/202412100848.HfPEKlvV-lkp@xxxxxxxxx/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202412100848.HfPEKlvV-lkp@xxxxxxxxx/ > > All errors (new ones prefixed by >>): > > In file included from <command-line>: > drivers/gpu/drm/i915/display/intel_backlight.c: In function 'scale': > >> include/linux/compiler_types.h:542:45: error: call to '__compiletime_assert_413' declared with > attribute error: clamp() low limit source_min greater than high limit source_max > 542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > | ^ > include/linux/compiler_types.h:523:25: note: in definition of macro '__compiletime_assert' > 523 | prefix ## suffix(); \ > | ^~~~~~ > include/linux/compiler_types.h:542:9: note: in expansion of macro '_compiletime_assert' > 542 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > | ^~~~~~~~~~~~~~~~~~~ > include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' > 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) > | ^~~~~~~~~~~~~~~~~~ > include/linux/minmax.h:109:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' > 109 | BUILD_BUG_ON_MSG(statically_true(ulo > uhi), \ > | ^~~~~~~~~~~~~~~~ > include/linux/minmax.h:116:9: note: in expansion of macro '__clamp_once' > 116 | __clamp_once(val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_), __UNIQUE_ID(h_)) > | ^~~~~~~~~~~~ > include/linux/minmax.h:192:28: note: in expansion of macro '__careful_clamp' > 192 | #define clamp(val, lo, hi) __careful_clamp(val, lo, hi) > | ^~~~~~~~~~~~~~~ > drivers/gpu/drm/i915/display/intel_backlight.c:47:22: note: in expansion of macro 'clamp' > 47 | source_val = clamp(source_val, source_min, source_max); > | ^~~~~ > > > vim +/__compiletime_assert_413 +542 include/linux/compiler_types.h > > eb5c2d4b45e3d2 Will Deacon 2020-07-21 528 > eb5c2d4b45e3d2 Will Deacon 2020-07-21 529 #define _compiletime_assert(condition, msg, prefix, > suffix) \ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 530 __compiletime_assert(condition, msg, prefix, suffix) > eb5c2d4b45e3d2 Will Deacon 2020-07-21 531 > eb5c2d4b45e3d2 Will Deacon 2020-07-21 532 /** > eb5c2d4b45e3d2 Will Deacon 2020-07-21 533 * compiletime_assert - break build and emit msg if > condition is false > eb5c2d4b45e3d2 Will Deacon 2020-07-21 534 * @condition: a compile-time constant condition to check > eb5c2d4b45e3d2 Will Deacon 2020-07-21 535 * @msg: a message to emit if condition is false > eb5c2d4b45e3d2 Will Deacon 2020-07-21 536 * > eb5c2d4b45e3d2 Will Deacon 2020-07-21 537 * In tradition of POSIX assert, this macro will break the > build if the > eb5c2d4b45e3d2 Will Deacon 2020-07-21 538 * supplied condition is *false*, emitting the supplied > error message if the > eb5c2d4b45e3d2 Will Deacon 2020-07-21 539 * compiler has support to do so. > eb5c2d4b45e3d2 Will Deacon 2020-07-21 540 */ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 541 #define compiletime_assert(condition, msg) \ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 @542 _compiletime_assert(condition, msg, > __compiletime_assert_, __COUNTER__) > eb5c2d4b45e3d2 Will Deacon 2020-07-21 543 > > :::::: The code at line 542 was first introduced by commit > :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into > compiler_types.h > > :::::: TO: Will Deacon <will@xxxxxxxxxx> > :::::: CC: Will Deacon <will@xxxxxxxxxx> > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
