The following commit has been merged into the locking/core branch of tip:
Commit-ID: a8772dccb2ec7b139db1b3ba782ecb12ed92d7c3
Gitweb: https://git.kernel.org/tip/a8772dccb2ec7b139db1b3ba782ecb12ed92d7c3
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 23 Jul 2020 11:56:49 +02:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 29 Jul 2020 16:14:30 +02:00
seqlock: Fold seqcount_LOCKNAME_t definition
Manual repetition is boring and error prone.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
include/linux/seqlock.h | 142 ++++++++++-----------------------------
1 file changed, 39 insertions(+), 103 deletions(-)
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index c689aba..4b259bb 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -150,21 +150,6 @@ do { \
} while (0)
/**
- * typedef seqcount_spinlock_t - sequence counter with spinlock associated
- * @seqcount: The real sequence counter
- * @lock: Pointer to the associated spinlock
- *
- * A plain sequence counter with external writer synchronization by a
- * spinlock. The spinlock is associated to the sequence count in the
- * static initializer or init function. This enables lockdep to validate
- * that the write side critical section is properly serialized.
- */
-typedef struct seqcount_spinlock {
- seqcount_t seqcount;
- __SEQ_LOCK(spinlock_t *lock);
-} seqcount_spinlock_t;
-
-/**
* SEQCNT_SPINLOCK_ZERO - static initializer for seqcount_spinlock_t
* @name: Name of the seqcount_spinlock_t instance
* @lock: Pointer to the associated spinlock
@@ -181,21 +166,6 @@ typedef struct seqcount_spinlock {
seqcount_locktype_init(s, lock)
/**
- * typedef seqcount_raw_spinlock_t - sequence count with raw spinlock associated
- * @seqcount: The real sequence counter
- * @lock: Pointer to the associated raw spinlock
- *
- * A plain sequence counter with external writer synchronization by a
- * raw spinlock. The raw spinlock is associated to the sequence count in
- * the static initializer or init function. This enables lockdep to
- * validate that the write side critical section is properly serialized.
- */
-typedef struct seqcount_raw_spinlock {
- seqcount_t seqcount;
- __SEQ_LOCK(raw_spinlock_t *lock);
-} seqcount_raw_spinlock_t;
-
-/**
* SEQCNT_RAW_SPINLOCK_ZERO - static initializer for seqcount_raw_spinlock_t
* @name: Name of the seqcount_raw_spinlock_t instance
* @lock: Pointer to the associated raw_spinlock
@@ -212,21 +182,6 @@ typedef struct seqcount_raw_spinlock {
seqcount_locktype_init(s, lock)
/**
- * typedef seqcount_rwlock_t - sequence count with rwlock associated
- * @seqcount: The real sequence counter
- * @lock: Pointer to the associated rwlock
- *
- * A plain sequence counter with external writer synchronization by a
- * rwlock. The rwlock is associated to the sequence count in the static
- * initializer or init function. This enables lockdep to validate that
- * the write side critical section is properly serialized.
- */
-typedef struct seqcount_rwlock {
- seqcount_t seqcount;
- __SEQ_LOCK(rwlock_t *lock);
-} seqcount_rwlock_t;
-
-/**
* SEQCNT_RWLOCK_ZERO - static initializer for seqcount_rwlock_t
* @name: Name of the seqcount_rwlock_t instance
* @lock: Pointer to the associated rwlock
@@ -243,24 +198,6 @@ typedef struct seqcount_rwlock {
seqcount_locktype_init(s, lock)
/**
- * typedef seqcount_mutex_t - sequence count with mutex associated
- * @seqcount: The real sequence counter
- * @lock: Pointer to the associated mutex
- *
- * A plain sequence counter with external writer synchronization by a
- * mutex. The mutex is associated to the sequence counter in the static
- * initializer or init function. This enables lockdep to validate that
- * the write side critical section is properly serialized.
- *
- * The write side API functions write_seqcount_begin()/end() automatically
- * disable and enable preemption when used with seqcount_mutex_t.
- */
-typedef struct seqcount_mutex {
- seqcount_t seqcount;
- __SEQ_LOCK(struct mutex *lock);
-} seqcount_mutex_t;
-
-/**
* SEQCNT_MUTEX_ZERO - static initializer for seqcount_mutex_t
* @name: Name of the seqcount_mutex_t instance
* @lock: Pointer to the associated mutex
@@ -277,24 +214,6 @@ typedef struct seqcount_mutex {
seqcount_locktype_init(s, lock)
/**
- * typedef seqcount_ww_mutex_t - sequence count with ww_mutex associated
- * @seqcount: The real sequence counter
- * @lock: Pointer to the associated ww_mutex
- *
- * A plain sequence counter with external writer synchronization by a
- * ww_mutex. The ww_mutex is associated to the sequence counter in the static
- * initializer or init function. This enables lockdep to validate that
- * the write side critical section is properly serialized.
- *
- * The write side API functions write_seqcount_begin()/end() automatically
- * disable and enable preemption when used with seqcount_ww_mutex_t.
- */
-typedef struct seqcount_ww_mutex {
- seqcount_t seqcount;
- __SEQ_LOCK(struct ww_mutex *lock);
-} seqcount_ww_mutex_t;
-
-/**
* SEQCNT_WW_MUTEX_ZERO - static initializer for seqcount_ww_mutex_t
* @name: Name of the seqcount_ww_mutex_t instance
* @lock: Pointer to the associated ww_mutex
@@ -310,30 +229,50 @@ typedef struct seqcount_ww_mutex {
#define seqcount_ww_mutex_init(s, lock) \
seqcount_locktype_init(s, lock)
-/*
- * @preempt: Is the associated write serialization lock preemtpible?
+/**
+ * typedef seqcount_LOCKNAME_t - sequence counter with spinlock associated
+ * @seqcount: The real sequence counter
+ * @lock: Pointer to the associated spinlock
+ *
+ * A plain sequence counter with external writer synchronization by a
+ * spinlock. The spinlock is associated to the sequence count in the
+ * static initializer or init function. This enables lockdep to validate
+ * that the write side critical section is properly serialized.
*/
-#define SEQCOUNT_LOCKTYPE(locktype, preempt, lockmember) \
-static inline seqcount_t * \
-__seqcount_##locktype##_ptr(seqcount_##locktype##_t *s) \
+
+/*
+ * SEQCOUNT_LOCKTYPE() - Instantiate seqcount_LOCKNAME_t and helpers
+ * @locktype: actual typename
+ * @lockname: name
+ * @preemptible: preemptibility of above locktype
+ * @lockmember: argument for lockdep_assert_held()
+ */
+#define SEQCOUNT_LOCKTYPE(locktype, lockname, preemptible, lockmember) \
+typedef struct seqcount_##lockname { \
+ seqcount_t seqcount; \
+ __SEQ_LOCK(locktype *lock); \
+} seqcount_##lockname##_t; \
+ \
+static __always_inline seqcount_t * \
+__seqcount_##lockname##_ptr(seqcount_##lockname##_t *s) \
{ \
return &s->seqcount; \
} \
\
-static inline bool \
-__seqcount_##locktype##_preemptible(seqcount_##locktype##_t *s) \
+static __always_inline bool \
+__seqcount_##lockname##_preemptible(seqcount_##lockname##_t *s) \
{ \
- return preempt; \
+ return preemptible; \
} \
\
-static inline void \
-__seqcount_##locktype##_assert(seqcount_##locktype##_t *s) \
+static __always_inline void \
+__seqcount_##lockname##_assert(seqcount_##lockname##_t *s) \
{ \
__SEQ_LOCK(lockdep_assert_held(lockmember)); \
}
/*
- * Similar hooks, but for plain seqcount_t
+ * __seqprop() for seqcount_t
*/
static inline seqcount_t *__seqcount_ptr(seqcount_t *s)
@@ -351,17 +290,14 @@ static inline void __seqcount_assert(seqcount_t *s)
lockdep_assert_preemption_disabled();
}
-/*
- * @s: Pointer to seqcount_locktype_t, generated hooks first parameter.
- */
-SEQCOUNT_LOCKTYPE(raw_spinlock, false, s->lock)
-SEQCOUNT_LOCKTYPE(spinlock, false, s->lock)
-SEQCOUNT_LOCKTYPE(rwlock, false, s->lock)
-SEQCOUNT_LOCKTYPE(mutex, true, s->lock)
-SEQCOUNT_LOCKTYPE(ww_mutex, true, &s->lock->base)
-
-#define __seqprop_case(s, locktype, prop) \
- seqcount_##locktype##_t: __seqcount_##locktype##_##prop((void *)(s))
+SEQCOUNT_LOCKTYPE(raw_spinlock_t, raw_spinlock, false, s->lock)
+SEQCOUNT_LOCKTYPE(spinlock_t, spinlock, false, s->lock)
+SEQCOUNT_LOCKTYPE(rwlock_t, rwlock, false, s->lock)
+SEQCOUNT_LOCKTYPE(struct mutex, mutex, true, s->lock)
+SEQCOUNT_LOCKTYPE(struct ww_mutex, ww_mutex, true, &s->lock->base)
+
+#define __seqprop_case(s, lockname, prop) \
+ seqcount_##lockname##_t: __seqcount_##lockname##_##prop((void *)(s))
#define __seqprop(s, prop) _Generic(*(s), \
seqcount_t: __seqcount_##prop((void *)(s)), \
|