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A single fix for lockdep which makes the recursion protection cover graph

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lock/unlock.
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Merge tag 'locking-urgent-2020-11-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking fix from Thomas Gleixner:
 "A single fix for lockdep which makes the recursion protection cover
  graph lock/unlock"

* tag 'locking-urgent-2020-11-22' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  lockdep: Put graph lock/unlock under lock_recursion protection
This commit is contained in:
Linus Torvalds 2020-11-22 13:19:53 -08:00
commit 855cf1ee47
1 changed files with 4 additions and 2 deletions
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6
kernel/locking/lockdep.c
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@ -108,19 +108,21 @@ static inline void lockdep_lock(void)
{
DEBUG_LOCKS_WARN_ON(!irqs_disabled());
__this_cpu_inc(lockdep_recursion);
arch_spin_lock(&__lock);
__owner = current;
__this_cpu_inc(lockdep_recursion);
}
static inline void lockdep_unlock(void)
{
DEBUG_LOCKS_WARN_ON(!irqs_disabled());
if (debug_locks && DEBUG_LOCKS_WARN_ON(__owner != current))
return;
__this_cpu_dec(lockdep_recursion);
__owner = NULL;
arch_spin_unlock(&__lock);
__this_cpu_dec(lockdep_recursion);
}
static inline bool lockdep_assert_locked(void)