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Since ::zeroed is used as one u32 to quickly zero the hot fields, it must be aligned to 4 to avoid slow unaligned accesses. Which means you need to move some more fields around a bit, so that its offset would again be aligned to 4. > 460 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > | ^ > include/linux/compiler_types.h:441:25: note: in definition of macro '__compiletime_assert' > 441 | prefix ## suffix(); \ > | ^~~~~~ > include/linux/compiler_types.h:460:9: note: in expansion of macro '_compiletime_assert' > 460 | _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/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG' > 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) > | ^~~~~~~~~~~~~~~~ > net/core/gro.c:496:9: note: in expansion of macro 'BUILD_BUG_ON' > 496 | BUILD_BUG_ON(!IS_ALIGNED(offsetof(struct napi_gro_cb, zeroed), > | ^~~~~~~~~~~~ > > > vim +/__compiletime_assert_654 +460 include/linux/compiler_types.h > > eb5c2d4b45e3d2 Will Deacon 2020-07-21 446 > eb5c2d4b45e3d2 Will Deacon 2020-07-21 447 #define _compiletime_assert(condition, msg, prefix, suffix) \ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 448 __compiletime_assert(condition, msg, prefix, suffix) > eb5c2d4b45e3d2 Will Deacon 2020-07-21 449 > eb5c2d4b45e3d2 Will Deacon 2020-07-21 450 /** > eb5c2d4b45e3d2 Will Deacon 2020-07-21 451 * compiletime_assert - break build and emit msg if condition is false > eb5c2d4b45e3d2 Will Deacon 2020-07-21 452 * @condition: a compile-time constant condition to check > eb5c2d4b45e3d2 Will Deacon 2020-07-21 453 * @msg: a message to emit if condition is false > eb5c2d4b45e3d2 Will Deacon 2020-07-21 454 * > eb5c2d4b45e3d2 Will Deacon 2020-07-21 455 * In tradition of POSIX assert, this macro will break the build if the > eb5c2d4b45e3d2 Will Deacon 2020-07-21 456 * supplied condition is *false*, emitting the supplied error message if the > eb5c2d4b45e3d2 Will Deacon 2020-07-21 457 * compiler has support to do so. > eb5c2d4b45e3d2 Will Deacon 2020-07-21 458 */ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 459 #define compiletime_assert(condition, msg) \ > eb5c2d4b45e3d2 Will Deacon 2020-07-21 @460 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) > eb5c2d4b45e3d2 Will Deacon 2020-07-21 461 > > :::::: The code at line 460 was first introduced by commit > :::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h > > :::::: TO: Will Deacon > :::::: CC: Will Deacon Thanks, Olek