Hi Marc, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git OLK-5.10 head: 3838d60c6f0bda86f712fbcee935bfb42e07b8bb commit: 611b93b7366a1e0c9df51c4628ea51bfe6db74d9 [3207/3207] clocksource/arm_arch_timer: Add build-time guards for unhandled register accesses config: arm64-randconfig-003-20250923 (https://download.01.org/0day-ci/archive/20250923/202509231925.VzrKhKii-lkp@i...) compiler: aarch64-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250923/202509231925.VzrKhKii-lkp@i...) 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@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509231925.VzrKhKii-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from <command-line>:0:0: In function 'arch_timer_reg_read_cp15', inlined from 'erratum_set_next_event_tval_generic' at drivers/clocksource/arm_arch_timer.c:157:7:

...

include/linux/compiler_types.h:323:38: error: call to '__compiletime_assert_183' declared with attribute error: BUILD_BUG failed _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:304:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler_types.h:323:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") ^~~~~~~~~~~~~~~~ arch/arm64/include/asm/arch_timer.h:159:2: note: in expansion of macro 'BUILD_BUG' BUILD_BUG(); ^~~~~~~~~ In function 'arch_timer_reg_write_cp15', inlined from 'erratum_set_next_event_tval_generic' at drivers/clocksource/arm_arch_timer.c:122:3: include/linux/compiler_types.h:323:38: error: call to '__compiletime_assert_180' declared with attribute error: BUILD_BUG failed _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:304:4: note: in definition of macro '__compiletime_assert' prefix ## suffix(); \ ^~~~~~ include/linux/compiler_types.h:323:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:59:21: note: in expansion of macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") ^~~~~~~~~~~~~~~~ arch/arm64/include/asm/arch_timer.h:130:3: note: in expansion of macro 'BUILD_BUG' BUILD_BUG(); ^~~~~~~~~

vim +/__compiletime_assert_183 +323 include/linux/compiler_types.h eb5c2d4b45e3d2d Will Deacon 2020-07-21 309 eb5c2d4b45e3d2d Will Deacon 2020-07-21 310 #define _compiletime_assert(condition, msg, prefix, suffix) \ eb5c2d4b45e3d2d Will Deacon 2020-07-21 311 __compiletime_assert(condition, msg, prefix, suffix) eb5c2d4b45e3d2d Will Deacon 2020-07-21 312 eb5c2d4b45e3d2d Will Deacon 2020-07-21 313 /** eb5c2d4b45e3d2d Will Deacon 2020-07-21 314 * compiletime_assert - break build and emit msg if condition is false eb5c2d4b45e3d2d Will Deacon 2020-07-21 315 * @condition: a compile-time constant condition to check eb5c2d4b45e3d2d Will Deacon 2020-07-21 316 * @msg: a message to emit if condition is false eb5c2d4b45e3d2d Will Deacon 2020-07-21 317 * eb5c2d4b45e3d2d Will Deacon 2020-07-21 318 * In tradition of POSIX assert, this macro will break the build if the eb5c2d4b45e3d2d Will Deacon 2020-07-21 319 * supplied condition is *false*, emitting the supplied error message if the eb5c2d4b45e3d2d Will Deacon 2020-07-21 320 * compiler has support to do so. eb5c2d4b45e3d2d Will Deacon 2020-07-21 321 */ eb5c2d4b45e3d2d Will Deacon 2020-07-21 322 #define compiletime_assert(condition, msg) \ eb5c2d4b45e3d2d Will Deacon 2020-07-21 @323 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) eb5c2d4b45e3d2d Will Deacon 2020-07-21 324 :::::: The code at line 323 was first introduced by commit :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h :::::: TO: Will Deacon <will@kernel.org> :::::: CC: Will Deacon <will@kernel.org> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki