Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1402874
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v4 3/5] locking/rwsem: Don't wake up one's own task |
| Date | 2016-05-18 12:40 +0200 |
| Message-ID | <rA73r-SY-15@gated-at.bofh.it> (permalink) |
| References | <rzYtc-3J2-3@gated-at.bofh.it> <rzYtc-3J2-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, May 17, 2016 at 09:26:21PM -0400, Waiman Long wrote: > As rwsem_down_read_failed() will queue itself and potentially call > __rwsem_do_wake(sem, RWSEM_WAKE_ANY), it is possible that a reader > will try to wake up its own task. This patch adds a check to make > sure that this won't happen. > Yes, this is 'weird', but why are we fixing it at the cost of an extra branch?
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH v4 0/5] [PATCH v3 0/4] locking/rwsem: Add reader-owned state to the owner field Waiman Long <Waiman.Long@hpe.com> - 2016-05-18 03:30 +0200
[PATCH v4 1/5] locking/rwsem: Add reader-owned state to the owner field Waiman Long <Waiman.Long@hpe.com> - 2016-05-18 03:30 +0200
[PATCH v4 3/5] locking/rwsem: Don't wake up one's own task Waiman Long <Waiman.Long@hpe.com> - 2016-05-18 03:30 +0200
Re: [PATCH v4 3/5] locking/rwsem: Don't wake up one's own task Peter Zijlstra <peterz@infradead.org> - 2016-05-18 12:40 +0200
Re: [PATCH v4 3/5] locking/rwsem: Don't wake up one's own task Waiman Long <waiman.long@hpe.com> - 2016-05-18 18:10 +0200
Re: [PATCH v4 0/5] [PATCH v3 0/4] locking/rwsem: Add reader-owned state to the owner field Peter Zijlstra <peterz@infradead.org> - 2016-05-18 13:00 +0200
csiph-web