summaryrefslogtreecommitdiffstats
path: root/Documentation/mutex-design.txt
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2010-10-06 19:11:17 -0700
committerDavid S. Miller <davem@davemloft.net>2010-10-06 19:11:17 -0700
commit12e94471b2be5ef9b55b10004a3a2cd819490036 (patch)
treef84ae818687dc7c35bd54f11bfb9717278d28a4e /Documentation/mutex-design.txt
parent79315068f4560f3f7bd6e9790190dcb43059770c (diff)
parentcb655d0f3d57c23db51b981648e452988c0223f9 (diff)
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'Documentation/mutex-design.txt')
-rw-r--r--Documentation/mutex-design.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/mutex-design.txt b/Documentation/mutex-design.txt
index c91ccc0720f..38c10fd7f41 100644
--- a/Documentation/mutex-design.txt
+++ b/Documentation/mutex-design.txt
@@ -9,7 +9,7 @@ firstly, there's nothing wrong with semaphores. But if the simpler
mutex semantics are sufficient for your code, then there are a couple
of advantages of mutexes:
- - 'struct mutex' is smaller on most architectures: .e.g on x86,
+ - 'struct mutex' is smaller on most architectures: E.g. on x86,
'struct semaphore' is 20 bytes, 'struct mutex' is 16 bytes.
A smaller structure size means less RAM footprint, and better
CPU-cache utilization.
@@ -136,3 +136,4 @@ the APIs of 'struct mutex' have been streamlined:
void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
int mutex_lock_interruptible_nested(struct mutex *lock,
unsigned int subclass);
+ int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);