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| author |   Juri Lelli <juri.lelli@gmail.com> | 2013-05-15 11:04:10 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2013-05-28 09:23:52 +0200 |
| commit | 0c1061733aa0303e6536c0bc7f86d68f5eb55446 (patch) | |
| tree | fc5b4530d524e71c889aac367530f678c4c71168 /kernel/rtmutex.c | |
| parent | locking: Fix copy/paste errors of "ARCH_INLINE_*_UNLOCK_BH" (diff) | |
| download | linux-dev-0c1061733aa0303e6536c0bc7f86d68f5eb55446.tar.xz linux-dev-0c1061733aa0303e6536c0bc7f86d68f5eb55446.zip | |
rtmutex: Document rt_mutex_adjust_prio_chain()
Parameters and usage of rt_mutex_adjust_prio_chain() are already
documented in Documentation/rt-mutex-design.txt. However, since this
function is called from several paths with different semantics (related
to the arguments), it is handy to have a quick reference directly in
the code.
Signed-off-by: Juri Lelli <juri.lelli@gmail.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1368608650-7935-1-git-send-email-juri.lelli@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/rtmutex.c')
| -rw-r--r-- | kernel/rtmutex.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c index 1e09308bf2a1..0dd6aec1cb6a 100644 --- a/kernel/rtmutex.c +++ b/kernel/rtmutex.c @@ -145,6 +145,19 @@ int max_lock_depth = 1024; /* * Adjust the priority chain. Also used for deadlock detection. * Decreases task's usage by one - may thus free the task. + * + * @task: the task owning the mutex (owner) for which a chain walk is probably + * needed + * @deadlock_detect: do we have to carry out deadlock detection? + * @orig_lock: the mutex (can be NULL if we are walking the chain to recheck + * things for a task that has just got its priority adjusted, and + * is waiting on a mutex) + * @orig_waiter: rt_mutex_waiter struct for the task that has just donated + * its priority to the mutex owner (can be NULL in the case + * depicted above or if the top waiter is gone away and we are + * actually deboosting the owner) + * @top_task: the current top waiter + * * Returns 0 or -EDEADLK. */ static int rt_mutex_adjust_prio_chain(struct task_struct *task, |