Hi all, After merging the akpm-current tree, today's linux-next build (x86_64 allmodconfig) failed like this: In file included from include/linux/bits.h:22, from arch/x86/include/asm/msr-index.h:5, from arch/x86/boot/cpucheck.c:28: include/linux/build_bug.h:49: warning: "BUILD_BUG_ON" redefined #define BUILD_BUG_ON(condition) \ In file included from arch/x86/boot/cpucheck.c:22: arch/x86/boot/boot.h:31: note: this is the location of the previous definition #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) Caused by commit d72f2a993607 ("linux/bits.h: add compile time sanity check of GENMASK inputs") -- Cheers, Stephen Rothwell