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> > I fail to see how the referred patch can cause an error in: > > /* !(BIT(31) & BIT(18)) == 1 */ > res = !test_bit(18, &bitopvar); > BUILD_BUG_ON(!__builtin_constant_p(res)); > BUILD_BUG_ON(!res); Kbuild bot sometimes fails on randconfigs and random commits blaming these commits even though they're unrelated. Esp this function, I dunno why, but time to time on different arches (um is the winner here) it fails to expand obvious stuff. This for sure depends on debug stuff configuration, let's say in the attached config I see KASAN enabled, but not always and it's unclear how to catch and reproduce stuff (and then how to fix) reliably. Re Clang and KASAN, there's this in lib/Makefile: obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_KASAN),yy) # FIXME: Clang breaks test_bitmap_const_eval when KASAN and GCOV are enabled GCOV_PROFILE_test_bitmap.o := n endif This was added a while ago not by me as I'm no instrumentation expert and have no idea about those GCOV_PROFILE etc. Does 19.1.7 want more than that to evaluate obvious things? > > Otherwise, the patch fixes a correctness issue, so there is nothing to > do with the patch anyway. > > Uros. Thanks, Olek