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由 Peter Zijlstra 提交于
Christoph requested lockdep_assert_held() variants that distinguish between held-for-read or held-for-write. Provide: int lock_is_held_type(struct lockdep_map *lock, int read) which takes the same argument as lock_acquire(.read) and matches it to the held_lock instance. Use of this function should be gated by the debug_locks variable. When that is 0 the return value of the lock_is_held_type() function is undefined. This is done to allow both negative and positive tests for holding locks. By default we provide (positive) lockdep_assert_held{,_exclusive,_read}() macros. Requested-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Tested-by: NJens Axboe <axboe@fb.com> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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