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f70405afc9
Modelled after lockdep_assert_held() and lockdep_assert_held_write(), but are always active, even when lockdep is disabled. Of course, they don't test that _this_ thread is the owner, but it's sufficient to catch many bugs and doesn't incur the same performance penalty as lockdep. Acked-by: "Peter Zijlstra (Intel)" <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Acked-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: "Matthew Wilcox (Oracle)" <willy@infradead.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
45 lines
1020 B
C
45 lines
1020 B
C
// SPDX-License-Identifier: GPL-2.0-only
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#ifndef _LINUX_RWBASE_RT_H
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#define _LINUX_RWBASE_RT_H
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#include <linux/rtmutex.h>
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#include <linux/atomic.h>
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#define READER_BIAS (1U << 31)
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#define WRITER_BIAS (1U << 30)
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struct rwbase_rt {
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atomic_t readers;
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struct rt_mutex_base rtmutex;
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};
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#define __RWBASE_INITIALIZER(name) \
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{ \
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.readers = ATOMIC_INIT(READER_BIAS), \
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.rtmutex = __RT_MUTEX_BASE_INITIALIZER(name.rtmutex), \
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}
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#define init_rwbase_rt(rwbase) \
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do { \
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rt_mutex_base_init(&(rwbase)->rtmutex); \
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atomic_set(&(rwbase)->readers, READER_BIAS); \
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} while (0)
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static __always_inline bool rw_base_is_locked(const struct rwbase_rt *rwb)
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{
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return atomic_read(&rwb->readers) != READER_BIAS;
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}
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static inline void rw_base_assert_held_write(const struct rwbase_rt *rwb)
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{
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WARN_ON(atomic_read(&rwb->readers) != WRITER_BIAS);
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}
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static __always_inline bool rw_base_is_contended(const struct rwbase_rt *rwb)
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{
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return atomic_read(&rwb->readers) > 0;
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}
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#endif /* _LINUX_RWBASE_RT_H */
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