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locking/lockdep: Use expanded masks on find_usage_*() functions

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In order to optimize check_irq_usage() and factorize all the IRQ usage
validations we'll need to be able to check multiple lock usage bits at
once. Prepare the low level usage mask check functions for that purpose.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: https://lkml.kernel.org/r/20190402160244.32434-4-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2019-04-02 18:02:43 +02:00 committed by Ingo Molnar
parent c902a1e8d9
commit 627f364d24
1 changed files with 10 additions and 10 deletions
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20
kernel/locking/lockdep.c
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@ -1682,9 +1682,9 @@ check_redundant(struct lock_list *root, struct lock_class *target,
* without creating any illegal irq-safe -> irq-unsafe lock dependency.
*/
static inline int usage_match(struct lock_list *entry, void *bit)
static inline int usage_match(struct lock_list *entry, void *mask)
{
return entry->class->usage_mask & (1 << (enum lock_usage_bit)bit);
return entry->class->usage_mask & *(unsigned long *)mask;
}
@ -1700,14 +1700,14 @@ static inline int usage_match(struct lock_list *entry, void *bit)
* Return <0 on error.
*/
static int
find_usage_forwards(struct lock_list *root, enum lock_usage_bit bit,
find_usage_forwards(struct lock_list *root, unsigned long usage_mask,
struct lock_list **target_entry)
{
int result;
debug_atomic_inc(nr_find_usage_forwards_checks);
result = __bfs_forwards(root, (void *)bit, usage_match, target_entry);
result = __bfs_forwards(root, &usage_mask, usage_match, target_entry);
return result;
}
@ -1723,14 +1723,14 @@ find_usage_forwards(struct lock_list *root, enum lock_usage_bit bit,
* Return <0 on error.
*/
static int
find_usage_backwards(struct lock_list *root, enum lock_usage_bit bit,
find_usage_backwards(struct lock_list *root, unsigned long usage_mask,
struct lock_list **target_entry)
{
int result;
debug_atomic_inc(nr_find_usage_backwards_checks);
result = __bfs_backwards(root, (void *)bit, usage_match, target_entry);
result = __bfs_backwards(root, &usage_mask, usage_match, target_entry);
return result;
}
@ -1935,7 +1935,7 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
this.parent = NULL;
this.class = hlock_class(prev);
ret = find_usage_backwards(&this, bit_backwards, &target_entry);
ret = find_usage_backwards(&this, lock_flag(bit_backwards), &target_entry);
if (ret < 0)
return print_bfs_bug(ret);
if (ret == 1)
@ -1943,7 +1943,7 @@ check_usage(struct task_struct *curr, struct held_lock *prev,
that.parent = NULL;
that.class = hlock_class(next);
ret = find_usage_forwards(&that, bit_forwards, &target_entry1);
ret = find_usage_forwards(&that, lock_flag(bit_forwards), &target_entry1);
if (ret < 0)
return print_bfs_bug(ret);
if (ret == 1)
@ -2941,7 +2941,7 @@ check_usage_forwards(struct task_struct *curr, struct held_lock *this,
root.parent = NULL;
root.class = hlock_class(this);
ret = find_usage_forwards(&root, bit, &target_entry);
ret = find_usage_forwards(&root, lock_flag(bit), &target_entry);
if (ret < 0)
return print_bfs_bug(ret);
if (ret == 1)
@ -2965,7 +2965,7 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
root.parent = NULL;
root.class = hlock_class(this);
ret = find_usage_backwards(&root, bit, &target_entry);
ret = find_usage_backwards(&root, lock_flag(bit), &target_entry);
if (ret < 0)
return print_bfs_bug(ret);
if (ret == 1)