From: Bart Van Assche <bvanassche@acm.org>
To: mingo@redhat.com
Cc: peterz@infradead.org, tj@kernel.org, longman@redhat.com,
johannes.berg@intel.com, linux-kernel@vger.kernel.org,
Bart Van Assche <bvanassche@acm.org>,
Johannes Berg <johannes@sipsolutions.net>
Subject: [PATCH v3 14/24] locking/lockdep: Make zap_class() remove all matching lock order entries
Date: Thu, 6 Dec 2018 17:11:38 -0800 [thread overview]
Message-ID: <20181207011148.251812-15-bvanassche@acm.org> (raw)
In-Reply-To: <20181207011148.251812-1-bvanassche@acm.org>
Make sure that all lock order entries that refer to a class are removed
from the list_entries[] array when a kernel module is unloaded.
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
include/linux/lockdep.h | 1 +
kernel/locking/lockdep.c | 17 +++++++++++------
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 1fd82ff99c65..6d0f8d1c2bee 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -180,6 +180,7 @@ static inline void lockdep_copy_map(struct lockdep_map *to,
struct lock_list {
struct list_head entry;
struct lock_class *class;
+ struct lock_class *links_to;
struct stack_trace trace;
int distance;
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 5c837a537273..ecd92969674c 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -859,7 +859,8 @@ static struct lock_list *alloc_list_entry(void)
/*
* Add a new dependency to the head of the list:
*/
-static int add_lock_to_list(struct lock_class *this, struct list_head *head,
+static int add_lock_to_list(struct lock_class *this,
+ struct lock_class *links_to, struct list_head *head,
unsigned long ip, int distance,
struct stack_trace *trace)
{
@@ -872,7 +873,9 @@ static int add_lock_to_list(struct lock_class *this, struct list_head *head,
if (!entry)
return 0;
+ WARN_ON_ONCE(this == links_to);
entry->class = this;
+ entry->links_to = links_to;
entry->distance = distance;
entry->trace = *trace;
/*
@@ -1918,14 +1921,14 @@ check_prev_add(struct task_struct *curr, struct held_lock *prev,
* Ok, all validations passed, add the new lock
* to the previous lock's dependency list:
*/
- ret = add_lock_to_list(hlock_class(next),
+ ret = add_lock_to_list(hlock_class(next), hlock_class(prev),
&hlock_class(prev)->locks_after,
next->acquire_ip, distance, trace);
if (!ret)
return 0;
- ret = add_lock_to_list(hlock_class(prev),
+ ret = add_lock_to_list(hlock_class(prev), hlock_class(next),
&hlock_class(next)->locks_before,
next->acquire_ip, distance, trace);
if (!ret)
@@ -4128,15 +4131,17 @@ void lockdep_reset(void)
*/
static void zap_class(struct lock_class *class)
{
+ struct lock_list *entry;
int i;
/*
* Remove all dependencies this lock is
* involved in:
*/
- for (i = 0; i < nr_list_entries; i++) {
- if (list_entries[i].class == class)
- list_del_rcu(&list_entries[i].entry);
+ for (i = 0, entry = list_entries; i < nr_list_entries; i++, entry++) {
+ if (entry->class != class && entry->links_to != class)
+ continue;
+ list_del_rcu(&entry->entry);
}
/*
* Unhash the class and remove it from the all_lock_classes list:
--
2.20.0.rc2.403.gdbc3b29805-goog
next prev parent reply other threads:[~2018-12-07 1:14 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-07 1:11 [PATCH v3 00/24] locking/lockdep: Add support for dynamic keys Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 01/24] lockdep tests: Display compiler warning and error messages Bart Van Assche
2018-12-11 15:22 ` [tip:locking/core] tools/lib/lockdep/tests: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 02/24] lockdep tests: Fix shellcheck warnings Bart Van Assche
2018-12-11 15:23 ` [tip:locking/core] tools/lib/lockdep/tests: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 03/24] lockdep tests: Improve testing accuracy Bart Van Assche
2018-12-11 15:23 ` [tip:locking/core] tools/lib/lockdep/tests: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 04/24] lockdep tests: Run lockdep tests a second time under Valgrind Bart Van Assche
2018-12-11 15:24 ` [tip:locking/core] tools/lib/lockdep/tests: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 05/24] liblockdep: Rename "trywlock" into "trywrlock" Bart Van Assche
2018-12-11 15:24 ` [tip:locking/core] tools/lib/lockdep: " tip-bot for Bart Van Assche
2018-12-11 17:19 ` [PATCH v3 05/24] liblockdep: " Sasha Levin
2018-12-11 17:38 ` Bart Van Assche
2018-12-13 19:41 ` Sasha Levin
2018-12-07 1:11 ` [PATCH v3 06/24] liblockdep: Add dummy print_irqtrace_events() implementation Bart Van Assche
2018-12-11 15:25 ` [tip:locking/core] tools/lib/lockdep: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 07/24] lockdep tests: Test the lockdep_reset_lock() implementation Bart Van Assche
2018-12-11 15:26 ` [tip:locking/core] tools/lib/lockdep/tests: " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 08/24] locking/lockdep: Declare local symbols static Bart Van Assche
2018-12-11 15:26 ` [tip:locking/core] " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 09/24] locking/lockdep: Inline __lockdep_init_map() Bart Van Assche
2018-12-11 15:27 ` [tip:locking/core] " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 10/24] locking/lockdep: Introduce lock_class_cache_is_registered() Bart Van Assche
2018-12-11 15:27 ` [tip:locking/core] " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 11/24] locking/lockdep: Remove a superfluous INIT_LIST_HEAD() statement Bart Van Assche
2018-12-11 15:28 ` [tip:locking/core] " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 12/24] locking/lockdep: Make concurrent lockdep_reset_lock() calls safe Bart Van Assche
2018-12-11 15:29 ` [tip:locking/core] " tip-bot for Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 13/24] locking/lockdep: Stop using RCU primitives to access all_lock_classes Bart Van Assche
2018-12-11 15:29 ` [tip:locking/core] locking/lockdep: Stop using RCU primitives to access 'all_lock_classes' tip-bot for Bart Van Assche
2018-12-07 1:11 ` Bart Van Assche [this message]
2018-12-07 1:11 ` [PATCH v3 15/24] locking/lockdep: Reorder struct lock_class members Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 16/24] locking/lockdep: Retain the class key and name while freeing a lock class Bart Van Assche
2018-12-07 10:21 ` Peter Zijlstra
2018-12-07 14:50 ` Waiman Long
2018-12-07 16:23 ` Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 17/24] locking/lockdep: Free lock classes that are no longer in use Bart Van Assche
2018-12-07 12:14 ` Peter Zijlstra
2018-12-07 16:27 ` Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 18/24] locking/lockdep: Reuse list entries " Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 19/24] locking/lockdep: Check data structure consistency Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 20/24] locking/lockdep: Introduce __lockdep_free_key_range() Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 21/24] locking/lockdep: Verify whether lock objects are small enough to be used as class keys Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 22/24] locking/lockdep: Add support for dynamic keys Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 23/24] kernel/workqueue: Use dynamic lockdep keys for workqueues Bart Van Assche
2018-12-07 1:11 ` [PATCH v3 24/24] lockdep tests: Test dynamic key registration Bart Van Assche
2018-12-07 12:23 ` [PATCH v3 00/24] locking/lockdep: Add support for dynamic keys Peter Zijlstra
2018-12-07 16:35 ` Bart Van Assche
2018-12-08 10:26 ` Peter Zijlstra
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