The patch titled
Subject: lockdep, rwsem: fix down_write_nest_lock() if !CONFIG_DEBUG_LOCK_ALLOC
has been added to the -mm tree. Its filename is
lockdep-rwsem-fix-down_write_nest_lock-if-config_debug_lock_alloc.patch
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------------------------------------------------------
From: Jiri Kosina <jkosina@xxxxxxx>
Subject: lockdep, rwsem: fix down_write_nest_lock() if !CONFIG_DEBUG_LOCK_ALLOC
Commit 1b963c81b1 ("lockdep, rwsem: provide down_write_nest_lock()")
contains a bug in a codepath when CONFIG_DEBUG_LOCK_ALLOC is disabled,
which causes down_read() to be called instead of down_write() by mistake
on such configurations. Fix that.
Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/rwsem.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/rwsem.h~lockdep-rwsem-fix-down_write_nest_lock-if-config_debug_lock_alloc include/linux/rwsem.h
--- a/include/linux/rwsem.h~lockdep-rwsem-fix-down_write_nest_lock-if-config_debug_lock_alloc
+++ a/include/linux/rwsem.h
@@ -135,7 +135,7 @@ do { \
#else
# define down_read_nested(sem, subclass) down_read(sem)
-# define down_write_nest_lock(sem, nest_lock) down_read(sem)
+# define down_write_nest_lock(sem, nest_lock) down_write(sem)
# define down_write_nested(sem, subclass) down_write(sem)
#endif
_
Patches currently in -mm which might be from jkosina@xxxxxxx are
origin.patch
lockdep-rwsem-fix-down_write_nest_lock-if-config_debug_lock_alloc.patch
linux-next.patch
fb-rework-locking-to-fix-lock-ordering-on-takeover.patch
fb-yet-another-band-aid-for-fixing-lockdep-mess.patch
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