Commit-ID: 046a619d8e9746fa4c0e29e8c6b78e16efc008a8
Gitweb: http://git.kernel.org/tip/046a619d8e9746fa4c0e29e8c6b78e16efc008a8
Author: Jason Low <jason.low2@xxxxxx>
AuthorDate: Mon, 14 Jul 2014 10:27:48 -0700
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 16 Jul 2014 13:28:03 +0200
locking/spinlocks/mcs: Rename optimistic_spin_queue() to optimistic_spin_node()
Currently, the per-cpu nodes structure for the cancellable MCS spinlock is
named "optimistic_spin_queue". However, in a follow up patch in the series
we will be introducing a new structure that serves as the new "handle" for
the lock. It would make more sense if that structure is named
"optimistic_spin_queue". Additionally, since the current use of the
"optimistic_spin_queue" structure are "nodes", it might be better if we
rename them to "node" anyway.
This preparatory patch renames all current "optimistic_spin_queue"
to "optimistic_spin_node".
Signed-off-by: Jason Low <jason.low2@xxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Scott Norton <scott.norton@xxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Waiman Long <waiman.long@xxxxxx>
Cc: Davidlohr Bueso <davidlohr@xxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Aswin Chandramouleeswaran <aswin@xxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Josef Bacik <jbacik@xxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1405358872-3732-2-git-send-email-jason.low2@xxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/mutex.h | 4 ++--
include/linux/rwsem.h | 4 ++--
kernel/locking/mcs_spinlock.c | 24 ++++++++++++------------
kernel/locking/mcs_spinlock.h | 8 ++++----
4 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 11692de..885f3f5 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -46,7 +46,7 @@
* - detects multi-task circular deadlocks and prints out all affected
* locks and tasks (and only those tasks)
*/
-struct optimistic_spin_queue;
+struct optimistic_spin_node;
struct mutex {
/* 1: unlocked, 0: locked, negative: locked, possible waiters */
atomic_t count;
@@ -56,7 +56,7 @@ struct mutex {
struct task_struct *owner;
#endif
#ifdef CONFIG_MUTEX_SPIN_ON_OWNER
- struct optimistic_spin_queue *osq; /* Spinner MCS lock */
+ struct optimistic_spin_node *osq; /* Spinner MCS lock */
#endif
#ifdef CONFIG_DEBUG_MUTEXES
const char *name;
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 8d79708..ba3f108 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -16,7 +16,7 @@
#include <linux/atomic.h>
-struct optimistic_spin_queue;
+struct optimistic_spin_node;
struct rw_semaphore;
#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
@@ -33,7 +33,7 @@ struct rw_semaphore {
* if the owner is running on the cpu.
*/
struct task_struct *owner;
- struct optimistic_spin_queue *osq; /* spinner MCS lock */
+ struct optimistic_spin_node *osq; /* spinner MCS lock */
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
diff --git a/kernel/locking/mcs_spinlock.c b/kernel/locking/mcs_spinlock.c
index 838dc9e..e9866f7 100644
--- a/kernel/locking/mcs_spinlock.c
+++ b/kernel/locking/mcs_spinlock.c
@@ -14,18 +14,18 @@
* called from interrupt context and we have preemption disabled while
* spinning.
*/
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct optimistic_spin_queue, osq_node);
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct optimistic_spin_node, osq_node);
/*
* Get a stable @node->next pointer, either for unlock() or unqueue() purposes.
* Can return NULL in case we were the last queued and we updated @lock instead.
*/
-static inline struct optimistic_spin_queue *
-osq_wait_next(struct optimistic_spin_queue **lock,
- struct optimistic_spin_queue *node,
- struct optimistic_spin_queue *prev)
+static inline struct optimistic_spin_node *
+osq_wait_next(struct optimistic_spin_node **lock,
+ struct optimistic_spin_node *node,
+ struct optimistic_spin_node *prev)
{
- struct optimistic_spin_queue *next = NULL;
+ struct optimistic_spin_node *next = NULL;
for (;;) {
if (*lock == node && cmpxchg(lock, node, prev) == node) {
@@ -59,10 +59,10 @@ osq_wait_next(struct optimistic_spin_queue **lock,
return next;
}
-bool osq_lock(struct optimistic_spin_queue **lock)
+bool osq_lock(struct optimistic_spin_node **lock)
{
- struct optimistic_spin_queue *node = this_cpu_ptr(&osq_node);
- struct optimistic_spin_queue *prev, *next;
+ struct optimistic_spin_node *node = this_cpu_ptr(&osq_node);
+ struct optimistic_spin_node *prev, *next;
node->locked = 0;
node->next = NULL;
@@ -149,10 +149,10 @@ unqueue:
return false;
}
-void osq_unlock(struct optimistic_spin_queue **lock)
+void osq_unlock(struct optimistic_spin_node **lock)
{
- struct optimistic_spin_queue *node = this_cpu_ptr(&osq_node);
- struct optimistic_spin_queue *next;
+ struct optimistic_spin_node *node = this_cpu_ptr(&osq_node);
+ struct optimistic_spin_node *next;
/*
* Fast path for the uncontended case.
diff --git a/kernel/locking/mcs_spinlock.h b/kernel/locking/mcs_spinlock.h
index a2dbac4..c99dc00 100644
--- a/kernel/locking/mcs_spinlock.h
+++ b/kernel/locking/mcs_spinlock.h
@@ -118,12 +118,12 @@ void mcs_spin_unlock(struct mcs_spinlock **lock, struct mcs_spinlock *node)
* mutex_lock()/rwsem_down_{read,write}() etc.
*/
-struct optimistic_spin_queue {
- struct optimistic_spin_queue *next, *prev;
+struct optimistic_spin_node {
+ struct optimistic_spin_node *next, *prev;
int locked; /* 1 if lock acquired */
};
-extern bool osq_lock(struct optimistic_spin_queue **lock);
-extern void osq_unlock(struct optimistic_spin_queue **lock);
+extern bool osq_lock(struct optimistic_spin_node **lock);
+extern void osq_unlock(struct optimistic_spin_node **lock);
#endif /* __LINUX_MCS_SPINLOCK_H */
--
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