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linux/rw_destroy: assert no holders before destroying

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While rw_destroy() may do nothing on Linux, we still want to make sure
that we don't have any holders outstanding like we do for mutexes.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17718
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Rob Norris 2025-09-11 01:59:57 +10:00 committed by GitHub
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commit fe2f7cf6d7
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include/os/linux/spl/sys/rwlock.h
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@ -130,7 +130,7 @@ RW_READ_HELD(krwlock_t *rwp)
/* /*
* The Linux rwsem implementation does not require a matching destroy. * The Linux rwsem implementation does not require a matching destroy.
*/ */
#define rw_destroy(rwp) ((void) 0) #define rw_destroy(rwp) ASSERT(!(RW_LOCK_HELD(rwp)))
/* /*
* Upgrading a rwsem from a reader to a writer is not supported by the * Upgrading a rwsem from a reader to a writer is not supported by the