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maple_tree: relax lockdep checks for on-stack trees 

To support early release of the maple tree locks, do not lockdep check the
lock if it is set to NULL.  This is intended for the special case on-stack
use of tracking entries and not for general use.

Link: https://lkml.kernel.org/r/20230714195551.894800-3-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oliver Sang <oliver.sang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-07-14 15:55:49 -04:00 committed by Andrew Morton
parent 2574d5e4df
commit 134d153c93
1 changed files with 3 additions and 1 deletions
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4
include/linux/maple_tree.h
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@ -182,7 +182,9 @@ enum maple_type {
#ifdef CONFIG_LOCKDEP
typedef struct lockdep_map *lockdep_map_p;
#define mt_lock_is_held(mt) lock_is_held(mt->ma_external_lock)
#define mt_lock_is_held(mt) \
(!(mt)->ma_external_lock || lock_is_held((mt)->ma_external_lock))
#define mt_set_external_lock(mt, lock) \
(mt)->ma_external_lock = &(lock)->dep_map
#else