Hi Eric, After merging the userns tree, today's linux-next build (powerpc allnoconfig) failed like this: In file included from include/linux/kobject.h:21:0, from include/linux/device.h:17, from arch/powerpc/include/asm/io.h:27, from arch/powerpc/include/asm/pgtable-ppc32.h:9, from arch/powerpc/include/asm/pgtable.h:19, from include/linux/mm.h:53, from include/linux/pid_namespace.h:6, from include/linux/ptrace.h:8, from arch/powerpc/mm/fault.c:24: include/linux/sysfs.h: In function 'sysfs_remove_mount_point': include/linux/sysfs.h:314:2: error: 'return' with a value, in function returning void [-Werror] return 0; ^ and many more :-( Caused by commit f7e299595408 ("sysfs: Add support for permanently empty directories to serve as mount points."). I have added the following fix patch for today: From: Stephen Rothwell Date: Mon, 25 May 2015 20:20:44 +1000 Subject: [PATCH] sysfs: void functions do not return values Signed-off-by: Stephen Rothwell --- include/linux/sysfs.h | 1 - 1 file changed, 1 deletion(-) diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h index 3e7e41acc451..9f65758311a4 100644 --- a/include/linux/sysfs.h +++ b/include/linux/sysfs.h @@ -311,7 +311,6 @@ static inline int sysfs_create_mount_point(struct kobject *parent_kobj, static inline void sysfs_remove_mount_point(struct kobject *parent_kobj, const char *name) { - return 0; } static inline int sysfs_create_file_ns(struct kobject *kobj, -- 2.1.4 -- Cheers, Stephen Rothwell sfr@canb.auug.org.au