3.18.27-rt27-rc1 stable review patch. If anyone has any objections, please let me know.

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From: Yang Shi yang.shi@linaro.org

fsf2_lock_all() calls down_write_nest_lock() to acquire a rw_sem and check a mutex, but down_write_nest_lock() is designed for two rw_sem accoring to the comment in include/linux/rwsem.h. And, other than f2fs, it is just called in mm/mmap.c with two rwsem.

So, it looks it is used wrongly by f2fs. And, it causes the below compile warning on -rt kernel too.

In file included from fs/f2fs/xattr.c:25:0: fs/f2fs/f2fs.h: In function 'f2fs_lock_all': fs/f2fs/f2fs.h:962:34: warning: passing argument 2 of 'down_write_nest_lock' from incompatible pointer type [-Wincompatible-pointer-types] f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex); ^

The nest annotation was anyway bogus as nested annotations for lockdep are only required if one nests two locks of the same lock class, which is not the case here.

Signed-off-by: Yang Shi yang.shi@linaro.org Cc: cm224.lee@samsung.com Cc: chao2.yu@samsung.com Cc: linaro-kernel@lists.linaro.org Cc: linux-rt-users@vger.kernel.org Cc: bigeasy@linutronix.de Cc: rostedt@goodmis.org Cc: linux-f2fs-devel@lists.sourceforge.net Cc: linux-fsdevel@vger.kernel.org Cc: jaegeuk@kernel.org Link: http://lkml.kernel.org/r/1456532725-4126-1-git-send-email-yang.shi@linaro.or... Signed-off-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Steven Rostedt rostedt@goodmis.org --- fs/f2fs/f2fs.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 8171e80b2ee9..5bb02f8e1f06 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -22,7 +22,6 @@

#ifdef CONFIG_F2FS_CHECK_FS #define f2fs_bug_on(sbi, condition) BUG_ON(condition) -#define f2fs_down_write(x, y) down_write_nest_lock(x, y) #else #define f2fs_bug_on(sbi, condition) \ do { \ @@ -31,7 +30,6 @@ sbi->need_fsck = true; \ } \ } while (0) -#define f2fs_down_write(x, y) down_write(x) #endif

/* @@ -699,7 +697,7 @@ static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)

static inline void f2fs_lock_all(struct f2fs_sb_info *sbi) { - f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex); + down_write(&sbi->cp_rwsem); }

static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)