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Remove stale comment from rw_tryupgrade()

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Commit f58040c0fc should have removed
this comment which is no longer relevant.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Clemens Fruhwirth <clemens@endorphin.org>
Issue #589
This commit is contained in:
Clemens Fruhwirth 2016-12-17 17:10:25 +01:00 committed by Brian Behlendorf
parent 9c9ad845ef
commit 6d064f7a07
1 changed files with 0 additions and 8 deletions
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8
include/sys/rwlock.h
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@ -213,14 +213,6 @@ RW_LOCK_HELD(krwlock_t *rwp)
spl_rw_lockdep_on_maybe(rwp); \
})
/*
* This implementation of rw_tryupgrade() behaves slightly differently
* from its counterparts on other platforms. It drops the RW_READER lock
* and then acquires the RW_WRITER lock leaving a small window where no
* lock is held. On other platforms the lock is never released during
* the upgrade process. This is necessary under Linux because the kernel
* does not provide an upgrade function.
*/
#define rw_tryupgrade(rwp) \
({ \
int _rc_ = 0; \