Hi Eric, After merging the userns tree, today's linux-next build (powerpc ppc64_defconfig) produced this warning: In file included from include/linux/sched.h:16:0, from arch/powerpc/lib/xor_vmx_glue.c:14: include/linux/shm.h:17:35: error: 'struct file' declared inside parameter list will not be visible outside of this definition or declaration [-Werror] bool is_file_shm_hugepages(struct file *file); ^~~~ and many, many more (most warnings, but some errors - arch/powerpc is mostly built with -Werror) Maybe caused by commit 1a5c1349d105 ("sem: Move struct sem and struct sem_array into ipc/sem.c") I have appplied the following fix patch for today: From: Stephen Rothwell Date: Wed, 28 Mar 2018 18:36:27 +1100 Subject: [PATCH] fix up for struct file no longer being available in shm.h Signed-off-by: Stephen Rothwell --- include/linux/shm.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/shm.h b/include/linux/shm.h index 3a8eae3ca33c..d8e69aed3d32 100644 --- a/include/linux/shm.h +++ b/include/linux/shm.h @@ -7,6 +7,8 @@ #include #include +struct file; + #ifdef CONFIG_SYSVIPC struct sysv_shm { struct list_head shm_clist; -- 2.16.1 -- Cheers, Stephen Rothwell