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[PATCH] rcu: Add lock annotations to RCU locking primitives

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Add __acquire annotations to rcu_read_lock and rcu_read_lock_bh, and add
__release annotations to rcu_read_unlock and rcu_read_unlock_bh.  This
allows sparse to detect improperly paired calls to these functions.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Josh Triplett 2006-06-30 01:56:05 -07:00 committed by Linus Torvalds
parent 7adc28ae75
commit 7f04ac062e
1 changed files with 20 additions and 4 deletions
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24
include/linux/rcupdate.h
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@ -163,14 +163,22 @@ extern int rcu_needs_cpu(int cpu);
*
* It is illegal to block while in an RCU read-side critical section.
*/
#define rcu_read_lock() preempt_disable()
#define rcu_read_lock() \
do { \
preempt_disable(); \
__acquire(RCU); \
} while(0)
/**
* rcu_read_unlock - marks the end of an RCU read-side critical section.
*
* See rcu_read_lock() for more information.
*/
#define rcu_read_unlock() preempt_enable()
#define rcu_read_unlock() \
do { \
__release(RCU); \
preempt_enable(); \
} while(0)
/*
* So where is rcu_write_lock()? It does not exist, as there is no
@ -193,14 +201,22 @@ extern int rcu_needs_cpu(int cpu);
* can use just rcu_read_lock().
*
*/
#define rcu_read_lock_bh() local_bh_disable()
#define rcu_read_lock_bh() \
do { \
local_bh_disable(); \
__acquire(RCU_BH); \
} while(0)
/*
* rcu_read_unlock_bh - marks the end of a softirq-only RCU critical section
*
* See rcu_read_lock_bh() for more information.
*/
#define rcu_read_unlock_bh() local_bh_enable()
#define rcu_read_unlock_bh() \
do { \
__release(RCU_BH); \
local_bh_enable(); \
} while(0)
/**
* rcu_dereference - fetch an RCU-protected pointer in an