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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-08 11:13:42 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-08 11:13:42 -0700 |
commit | 79637a41e466bbe7dfe394bac3c9d86a92fd55b1 (patch) | |
tree | 0ee720d20572a3e1f901f78331b57612984f1e2e /Documentation | |
parent | 899edae615c806f78880077bd46f04d7f23ae6e6 (diff) | |
parent | b3bd3de66f60df4c9a2076e2886a622458929056 (diff) | |
download | linux-79637a41e466bbe7dfe394bac3c9d86a92fd55b1.tar.bz2 |
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
gcc-4.6: kernel/*: Fix unused but set warnings
mutex: Fix annotations to include it in kernel-locking docbook
pid: make setpgid() system call use RCU read-side critical section
MAINTAINERS: Add RCU's public git tree
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/DocBook/kernel-locking.tmpl | 6 | ||||
-rw-r--r-- | Documentation/mutex-design.txt | 3 |
2 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl index 0b1a3f97f285..a0d479d1e1dd 100644 --- a/Documentation/DocBook/kernel-locking.tmpl +++ b/Documentation/DocBook/kernel-locking.tmpl @@ -1961,6 +1961,12 @@ machines due to caching. </sect1> </chapter> + <chapter id="apiref"> + <title>Mutex API reference</title> +!Iinclude/linux/mutex.h +!Ekernel/mutex.c + </chapter> + <chapter id="references"> <title>Further reading</title> diff --git a/Documentation/mutex-design.txt b/Documentation/mutex-design.txt index c91ccc0720fa..38c10fd7f411 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); |