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fbd7a5a035
Since we've exposed Lock::from_raw() and Guard::new() publically, we
want to be able to make sure that we assert that a lock is actually held
when constructing a Guard for it to handle instances of unsafe
Guard::new() calls outside of our lock module.
Hence add a new method assert_is_held() to Backend, which uses lockdep
to check whether or not a lock has been acquired. When lockdep is
disabled, this has no overhead.
[Boqun: Resolve the conflicts with exposing Guard::new(), reword the
commit log a bit and format "unsafe { <statement>; }" into "unsafe {
<statement> }" for the consistency. ]
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20241125204139.656801-1-lyude@redhat.com
38 lines
814 B
C
38 lines
814 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/spinlock.h>
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void rust_helper___spin_lock_init(spinlock_t *lock, const char *name,
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struct lock_class_key *key)
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{
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#ifdef CONFIG_DEBUG_SPINLOCK
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# if defined(CONFIG_PREEMPT_RT)
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__spin_lock_init(lock, name, key, false);
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# else /*!CONFIG_PREEMPT_RT */
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__raw_spin_lock_init(spinlock_check(lock), name, key, LD_WAIT_CONFIG);
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# endif /* CONFIG_PREEMPT_RT */
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#else /* !CONFIG_DEBUG_SPINLOCK */
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spin_lock_init(lock);
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#endif /* CONFIG_DEBUG_SPINLOCK */
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}
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void rust_helper_spin_lock(spinlock_t *lock)
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{
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spin_lock(lock);
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}
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void rust_helper_spin_unlock(spinlock_t *lock)
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{
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spin_unlock(lock);
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}
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int rust_helper_spin_trylock(spinlock_t *lock)
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{
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return spin_trylock(lock);
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}
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void rust_helper_spin_assert_is_held(spinlock_t *lock)
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{
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lockdep_assert_held(lock);
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}
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