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authorLiam R. Howlett <howlett@gmail.com>2007-12-06 17:37:59 -0500
committerMatthew Wilcox <willy@linux.intel.com>2007-12-06 17:37:59 -0500
commitad776537cc6b4b936cfd11893e7b698dfa072666 (patch)
treeb553f03f34ce8750150765755abaaec27943fa0d /kernel/mutex.c
parent0b94e97a25d9b06ef17fca8da23169200bead1e2 (diff)
downloadlinaro-lsk-ad776537cc6b4b936cfd11893e7b698dfa072666.tar.gz
Add mutex_lock_killable
Similar to mutex_lock_interruptible, it can be interrupted by a fatal signal only. Signed-off-by: Liam R. Howlett <howlett@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Diffstat (limited to 'kernel/mutex.c')
-rw-r--r--kernel/mutex.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/kernel/mutex.c b/kernel/mutex.c
index d7fe50cc556..d9ec9b66625 100644
--- a/kernel/mutex.c
+++ b/kernel/mutex.c
@@ -166,9 +166,12 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
* got a signal? (This code gets eliminated in the
* TASK_UNINTERRUPTIBLE case.)
*/
- if (unlikely(state == TASK_INTERRUPTIBLE &&
- signal_pending(task))) {
- mutex_remove_waiter(lock, &waiter, task_thread_info(task));
+ if (unlikely((state == TASK_INTERRUPTIBLE &&
+ signal_pending(task)) ||
+ (state == TASK_KILLABLE &&
+ fatal_signal_pending(task)))) {
+ mutex_remove_waiter(lock, &waiter,
+ task_thread_info(task));
mutex_release(&lock->dep_map, 1, ip);
spin_unlock_mutex(&lock->wait_lock, flags);
@@ -211,6 +214,14 @@ mutex_lock_nested(struct mutex *lock, unsigned int subclass)
EXPORT_SYMBOL_GPL(mutex_lock_nested);
int __sched
+mutex_lock_killable_nested(struct mutex *lock, unsigned int subclass)
+{
+ might_sleep();
+ return __mutex_lock_common(lock, TASK_KILLABLE, subclass, _RET_IP_);
+}
+EXPORT_SYMBOL_GPL(mutex_lock_killable_nested);
+
+int __sched
mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass)
{
might_sleep();
@@ -272,6 +283,9 @@ __mutex_unlock_slowpath(atomic_t *lock_count)
* mutex_lock_interruptible() and mutex_trylock().
*/
static int fastcall noinline __sched
+__mutex_lock_killable_slowpath(atomic_t *lock_count);
+
+static noinline int fastcall __sched
__mutex_lock_interruptible_slowpath(atomic_t *lock_count);
/***
@@ -294,6 +308,14 @@ int fastcall __sched mutex_lock_interruptible(struct mutex *lock)
EXPORT_SYMBOL(mutex_lock_interruptible);
+int fastcall __sched mutex_lock_killable(struct mutex *lock)
+{
+ might_sleep();
+ return __mutex_fastpath_lock_retval
+ (&lock->count, __mutex_lock_killable_slowpath);
+}
+EXPORT_SYMBOL(mutex_lock_killable);
+
static void fastcall noinline __sched
__mutex_lock_slowpath(atomic_t *lock_count)
{
@@ -303,6 +325,14 @@ __mutex_lock_slowpath(atomic_t *lock_count)
}
static int fastcall noinline __sched
+__mutex_lock_killable_slowpath(atomic_t *lock_count)
+{
+ struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+ return __mutex_lock_common(lock, TASK_KILLABLE, 0, _RET_IP_);
+}
+
+static noinline int fastcall __sched
__mutex_lock_interruptible_slowpath(atomic_t *lock_count)
{
struct mutex *lock = container_of(lock_count, struct mutex, count);