From: Oleg Nesterov <oleg@redhat.com>
To: Al Viro <viro@zeniv.linux.org.uk>,
Dave Chinner <david@fromorbit.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Jan Kara <jack@suse.cz>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 5/8] percpu-rwsem: introduce percpu_rwsem_release() and percpu_rwsem_acquire()
Date: Tue, 11 Aug 2015 19:04:10 +0200 [thread overview]
Message-ID: <20150811170410.GA26921@redhat.com> (raw)
In-Reply-To: <20150811170343.GA26881@redhat.com>
Add percpu_rwsem_release() and percpu_rwsem_acquire() for the users
which need to return to userspace with percpu-rwsem lock held and/or
pass the ownership to another thread.
TODO: change percpu_rwsem_release() to use rwsem_clear_owner(). We can
either fold kernel/locking/rwsem.h into include/linux/rwsem.h, or add
the non-inline percpu_rwsem_clear_owner().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/percpu-rwsem.h | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h
index 3ebf982..06af654 100644
--- a/include/linux/percpu-rwsem.h
+++ b/include/linux/percpu-rwsem.h
@@ -33,4 +33,23 @@ extern void percpu_free_rwsem(struct percpu_rw_semaphore *);
__percpu_init_rwsem(brw, #brw, &rwsem_key); \
})
+
+#define percpu_rwsem_is_held(sem) lockdep_is_held(&(sem)->rw_sem)
+
+static inline void percpu_rwsem_release(struct percpu_rw_semaphore *sem,
+ bool read, unsigned long ip)
+{
+ lock_release(&sem->rw_sem.dep_map, 1, ip);
+#ifdef CONFIG_RWSEM_SPIN_ON_OWNER
+ if (!read)
+ sem->rw_sem.owner = NULL;
+#endif
+}
+
+static inline void percpu_rwsem_acquire(struct percpu_rw_semaphore *sem,
+ bool read, unsigned long ip)
+{
+ lock_acquire(&sem->rw_sem.dep_map, 0, 1, read, 1, NULL, ip);
+}
+
#endif
--
1.5.5.1
next prev parent reply other threads:[~2015-08-11 17:06 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 17:03 [PATCH v2 0/8] change sb_writers to use percpu_rw_semaphore Oleg Nesterov
2015-08-11 17:03 ` [PATCH v2 1/8] introduce __sb_{acquire,release}_write() helpers Oleg Nesterov
2015-08-13 9:45 ` Jan Kara
2015-08-13 9:56 ` Jan Kara
2015-08-13 13:17 ` Oleg Nesterov
2015-08-13 13:32 ` Jan Kara
2015-08-13 13:37 ` Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 2/8] fix the broken lockdep logic in __sb_start_write() Oleg Nesterov
2015-08-13 10:02 ` Jan Kara
2015-08-13 13:22 ` Oleg Nesterov
2015-08-13 13:29 ` Jan Kara
2015-08-11 17:04 ` [PATCH v2 3/8] document rwsem_release() in sb_wait_write() Oleg Nesterov
2015-08-13 10:22 ` Jan Kara
2015-08-11 17:04 ` [PATCH v2 4/8] percpu-rwsem: introduce percpu_down_read_trylock() Oleg Nesterov
2015-08-11 17:04 ` Oleg Nesterov [this message]
2015-08-11 17:04 ` [PATCH v2 6/8] percpu-rwsem: kill CONFIG_PERCPU_RWSEM Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 7/8] shift percpu_counter_destroy() into destroy_super_work() Oleg Nesterov
2015-08-13 10:35 ` Jan Kara
2015-08-13 13:36 ` Oleg Nesterov
2015-08-13 14:09 ` Jan Kara
2015-08-13 15:20 ` Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 8/8] change sb_writers to use percpu_rw_semaphore Oleg Nesterov
2015-08-13 10:48 ` Jan Kara
2015-08-12 13:11 ` [PATCH v2 9/8] don't fool lockdep in freeze_super() and thaw_super() paths Oleg Nesterov
2015-08-13 11:01 ` Jan Kara
2015-08-13 13:58 ` Oleg Nesterov
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