From: Peter Zijlstra <peterz@infradead.org>
To: peterz@infradead.org, mingo@redhat.com, will@kernel.org,
longman@redhat.com, boqun.feng@gmail.com
Cc: linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [PATCH] locking/lockdep: Fix lockdep_init_map_*() confusion
Date: Fri, 17 Jun 2022 15:39:26 +0200 [thread overview]
Message-ID: <YqyEDtoan20K0CVD@worktop.programming.kicks-ass.net> (raw)
Commit dfd5e3f5fe27 ("locking/lockdep: Mark local_lock_t") added yet
another lockdep_init_map_*() variant, but forgot to update all the
existing users of the most complicated version.
This could lead to a loss of lock_type and hence an incorrect report.
Given the relative rarity of both local_lock and these annotations,
this is unlikely to happen in practise, still, best fix things.
Fixes: dfd5e3f5fe27 ("locking/lockdep: Mark local_lock_t")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/lockdep.h | 30 +++++++++++++++++-------------
kernel/locking/lockdep.c | 7 ++++---
2 files changed, 21 insertions(+), 16 deletions(-)
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -188,7 +188,7 @@ static inline void
lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
struct lock_class_key *key, int subclass, u8 inner, u8 outer)
{
- lockdep_init_map_type(lock, name, key, subclass, inner, LD_WAIT_INV, LD_LOCK_NORMAL);
+ lockdep_init_map_type(lock, name, key, subclass, inner, outer, LD_LOCK_NORMAL);
}
static inline void
@@ -211,24 +211,28 @@ static inline void lockdep_init_map(stru
* or they are too narrow (they suffer from a false class-split):
*/
#define lockdep_set_class(lock, key) \
- lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0, \
- (lock)->dep_map.wait_type_inner, \
- (lock)->dep_map.wait_type_outer)
+ lockdep_init_map_type(&(lock)->dep_map, #key, key, 0, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
#define lockdep_set_class_and_name(lock, key, name) \
- lockdep_init_map_waits(&(lock)->dep_map, name, key, 0, \
- (lock)->dep_map.wait_type_inner, \
- (lock)->dep_map.wait_type_outer)
+ lockdep_init_map_type(&(lock)->dep_map, name, key, 0, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
#define lockdep_set_class_and_subclass(lock, key, sub) \
- lockdep_init_map_waits(&(lock)->dep_map, #key, key, sub,\
- (lock)->dep_map.wait_type_inner, \
- (lock)->dep_map.wait_type_outer)
+ lockdep_init_map_type(&(lock)->dep_map, #key, key, sub, \
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
#define lockdep_set_subclass(lock, sub) \
- lockdep_init_map_waits(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
- (lock)->dep_map.wait_type_inner, \
- (lock)->dep_map.wait_type_outer)
+ lockdep_init_map_type(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
+ (lock)->dep_map.wait_type_inner, \
+ (lock)->dep_map.wait_type_outer, \
+ (lock)->dep_map.lock_type)
#define lockdep_set_novalidate_class(lock) \
lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -5238,9 +5238,10 @@ __lock_set_class(struct lockdep_map *loc
return 0;
}
- lockdep_init_map_waits(lock, name, key, 0,
- lock->wait_type_inner,
- lock->wait_type_outer);
+ lockdep_init_map_type(lock, name, key, 0,
+ lock->wait_type_inner,
+ lock->wait_type_outer,
+ lock->lock_type);
class = register_lock_class(lock, subclass, 0);
hlock->class_idx = class - lock_classes;
next reply other threads:[~2022-06-17 13:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-17 13:39 Peter Zijlstra [this message]
2022-06-17 14:57 ` [PATCH] locking/lockdep: Fix lockdep_init_map_*() confusion Waiman Long
2022-06-28 7:09 ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
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