Hi Andrew, After merging the akpm-current tree, today's linux-next build (powerpc ppc64_defconfig) failed like this: In file included from arch/powerpc/kernel/asm-offsets.c:16:0: include/linux/signal.h: In function 'sigisemptyset': include/linux/signal.h:79:3: error: implicit declaration of function 'BUILD_BUG' [-Werror=implicit-function-declaration] BUILD_BUG(); ^ Caused by commit 7e52cdba7e69 ("signal: use BUILD_BUG() instead of _NSIG_WORDS_is_unsupported_size()"). See Rule 1 in Documentation/SubmitChecklist. Thanks to Guenter for the heads up. I have added the following patch for today (hopefully it does not cause more problems). From: Stephen Rothwell Date: Fri, 26 Sep 2014 20:08:12 +1000 Subject: [PATCH] signal.h: using BUILD_BUG requires including bug.h Signed-off-by: Stephen Rothwell --- include/linux/signal.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/signal.h b/include/linux/signal.h index 14acfd59ed1b..ab1e0392b5ac 100644 --- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -2,6 +2,7 @@ #define _LINUX_SIGNAL_H #include +#include #include struct task_struct; -- 2.1.1 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au