Merge drm/drm-fixes into drm-misc-fixes

7.0-rc1 was just released, let's merge it to kick the new release cycle.

Signed-off-by: Maxime Ripard <mripard@kernel.org>

1 files changed, 48 insertions, 9 deletions

diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 221123660e71..5a40252b8334 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -14,6 +14,7 @@
  */
 
 #include <linux/compiler.h>
+#include <linux/cleanup.h>
 #include <linux/kcsan-checks.h>
 #include <linux/lockdep.h>
 #include <linux/mutex.h>
@@ -832,6 +833,7 @@ static __always_inline void write_seqcount_latch_end(seqcount_latch_t *s)
  * Return: count, to be passed to read_seqretry()
  */
 static inline unsigned read_seqbegin(const seqlock_t *sl)
+	__acquires_shared(sl) __no_context_analysis
 {
 	return read_seqcount_begin(&sl->seqcount);
 }
@@ -848,6 +850,7 @@ static inline unsigned read_seqbegin(const seqlock_t *sl)
  * Return: true if a read section retry is required, else false
  */
 static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
+	__releases_shared(sl) __no_context_analysis
 {
 	return read_seqcount_retry(&sl->seqcount, start);
 }
@@ -872,6 +875,7 @@ static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
  * _irqsave or _bh variants of this function instead.
  */
 static inline void write_seqlock(seqlock_t *sl)
+	__acquires(sl) __no_context_analysis
 {
 	spin_lock(&sl->lock);
 	do_write_seqcount_begin(&sl->seqcount.seqcount);
@@ -885,6 +889,7 @@ static inline void write_seqlock(seqlock_t *sl)
  * critical section of given seqlock_t.
  */
 static inline void write_sequnlock(seqlock_t *sl)
+	__releases(sl) __no_context_analysis
 {
 	do_write_seqcount_end(&sl->seqcount.seqcount);
 	spin_unlock(&sl->lock);
@@ -898,6 +903,7 @@ static inline void write_sequnlock(seqlock_t *sl)
  * other write side sections, can be invoked from softirq contexts.
  */
 static inline void write_seqlock_bh(seqlock_t *sl)
+	__acquires(sl) __no_context_analysis
 {
 	spin_lock_bh(&sl->lock);
 	do_write_seqcount_begin(&sl->seqcount.seqcount);
@@ -912,6 +918,7 @@ static inline void write_seqlock_bh(seqlock_t *sl)
  * write_seqlock_bh().
  */
 static inline void write_sequnlock_bh(seqlock_t *sl)
+	__releases(sl) __no_context_analysis
 {
 	do_write_seqcount_end(&sl->seqcount.seqcount);
 	spin_unlock_bh(&sl->lock);
@@ -925,6 +932,7 @@ static inline void write_sequnlock_bh(seqlock_t *sl)
  * other write sections, can be invoked from hardirq contexts.
  */
 static inline void write_seqlock_irq(seqlock_t *sl)
+	__acquires(sl) __no_context_analysis
 {
 	spin_lock_irq(&sl->lock);
 	do_write_seqcount_begin(&sl->seqcount.seqcount);
@@ -938,12 +946,14 @@ static inline void write_seqlock_irq(seqlock_t *sl)
  * seqlock_t write side section opened with write_seqlock_irq().
  */
 static inline void write_sequnlock_irq(seqlock_t *sl)
+	__releases(sl) __no_context_analysis
 {
 	do_write_seqcount_end(&sl->seqcount.seqcount);
 	spin_unlock_irq(&sl->lock);
 }
 
 static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
+	__acquires(sl) __no_context_analysis
 {
 	unsigned long flags;
 
@@ -976,6 +986,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
  */
 static inline void
 write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
+	__releases(sl) __no_context_analysis
 {
 	do_write_seqcount_end(&sl->seqcount.seqcount);
 	spin_unlock_irqrestore(&sl->lock, flags);
@@ -998,6 +1009,7 @@ write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
  * The opened read section must be closed with read_sequnlock_excl().
  */
 static inline void read_seqlock_excl(seqlock_t *sl)
+	__acquires_shared(sl) __no_context_analysis
 {
 	spin_lock(&sl->lock);
 }
@@ -1007,6 +1019,7 @@ static inline void read_seqlock_excl(seqlock_t *sl)
  * @sl: Pointer to seqlock_t
  */
 static inline void read_sequnlock_excl(seqlock_t *sl)
+	__releases_shared(sl) __no_context_analysis
 {
 	spin_unlock(&sl->lock);
 }
@@ -1021,6 +1034,7 @@ static inline void read_sequnlock_excl(seqlock_t *sl)
  * from softirq contexts.
  */
 static inline void read_seqlock_excl_bh(seqlock_t *sl)
+	__acquires_shared(sl) __no_context_analysis
 {
 	spin_lock_bh(&sl->lock);
 }
@@ -1031,6 +1045,7 @@ static inline void read_seqlock_excl_bh(seqlock_t *sl)
  * @sl: Pointer to seqlock_t
  */
 static inline void read_sequnlock_excl_bh(seqlock_t *sl)
+	__releases_shared(sl) __no_context_analysis
 {
 	spin_unlock_bh(&sl->lock);
 }
@@ -1045,6 +1060,7 @@ static inline void read_sequnlock_excl_bh(seqlock_t *sl)
  * hardirq context.
  */
 static inline void read_seqlock_excl_irq(seqlock_t *sl)
+	__acquires_shared(sl) __no_context_analysis
 {
 	spin_lock_irq(&sl->lock);
 }
@@ -1055,11 +1071,13 @@ static inline void read_seqlock_excl_irq(seqlock_t *sl)
  * @sl: Pointer to seqlock_t
  */
 static inline void read_sequnlock_excl_irq(seqlock_t *sl)
+	__releases_shared(sl) __no_context_analysis
 {
 	spin_unlock_irq(&sl->lock);
 }
 
 static inline unsigned long __read_seqlock_excl_irqsave(seqlock_t *sl)
+	__acquires_shared(sl) __no_context_analysis
 {
 	unsigned long flags;
 
@@ -1089,6 +1107,7 @@ static inline unsigned long __read_seqlock_excl_irqsave(seqlock_t *sl)
  */
 static inline void
 read_sequnlock_excl_irqrestore(seqlock_t *sl, unsigned long flags)
+	__releases_shared(sl) __no_context_analysis
 {
 	spin_unlock_irqrestore(&sl->lock, flags);
 }
@@ -1125,6 +1144,7 @@ read_sequnlock_excl_irqrestore(seqlock_t *sl, unsigned long flags)
  * parameter of the next read_seqbegin_or_lock() iteration.
  */
 static inline void read_seqbegin_or_lock(seqlock_t *lock, int *seq)
+	__acquires_shared(lock) __no_context_analysis
 {
 	if (!(*seq & 1))	/* Even */
 		*seq = read_seqbegin(lock);
@@ -1140,6 +1160,7 @@ static inline void read_seqbegin_or_lock(seqlock_t *lock, int *seq)
  * Return: true if a read section retry is required, false otherwise
  */
 static inline int need_seqretry(seqlock_t *lock, int seq)
+	__releases_shared(lock) __no_context_analysis
 {
 	return !(seq & 1) && read_seqretry(lock, seq);
 }
@@ -1153,6 +1174,7 @@ static inline int need_seqretry(seqlock_t *lock, int seq)
  * with read_seqbegin_or_lock() and validated by need_seqretry().
  */
 static inline void done_seqretry(seqlock_t *lock, int seq)
+	__no_context_analysis
 {
 	if (seq & 1)
 		read_sequnlock_excl(lock);
@@ -1180,6 +1202,7 @@ static inline void done_seqretry(seqlock_t *lock, int seq)
  */
 static inline unsigned long
 read_seqbegin_or_lock_irqsave(seqlock_t *lock, int *seq)
+	__acquires_shared(lock) __no_context_analysis
 {
 	unsigned long flags = 0;
 
@@ -1205,6 +1228,7 @@ read_seqbegin_or_lock_irqsave(seqlock_t *lock, int *seq)
  */
 static inline void
 done_seqretry_irqrestore(seqlock_t *lock, int seq, unsigned long flags)
+	__no_context_analysis
 {
 	if (seq & 1)
 		read_sequnlock_excl_irqrestore(lock, flags);
@@ -1225,6 +1249,7 @@ struct ss_tmp {
 };
 
 static __always_inline void __scoped_seqlock_cleanup(struct ss_tmp *sst)
+	__no_context_analysis
 {
 	if (sst->lock)
 		spin_unlock(sst->lock);
@@ -1254,6 +1279,7 @@ extern void __scoped_seqlock_bug(void);
 
 static __always_inline void
 __scoped_seqlock_next(struct ss_tmp *sst, seqlock_t *lock, enum ss_state target)
+	__no_context_analysis
 {
 	switch (sst->state) {
 	case ss_done:
@@ -1296,22 +1322,31 @@ __scoped_seqlock_next(struct ss_tmp *sst, seqlock_t *lock, enum ss_state target)
 	}
 }
 
+/*
+ * Context analysis no-op helper to release seqlock at the end of the for-scope;
+ * the alias analysis of the compiler will recognize that the pointer @s is an
+ * alias to @_seqlock passed to read_seqbegin(_seqlock) below.
+ */
+static __always_inline void __scoped_seqlock_cleanup_ctx(struct ss_tmp **s)
+	__releases_shared(*((seqlock_t **)s)) __no_context_analysis {}
+
 #define __scoped_seqlock_read(_seqlock, _target, _s)			\
 	for (struct ss_tmp _s __cleanup(__scoped_seqlock_cleanup) =	\
-	     { .state = ss_lockless, .data = read_seqbegin(_seqlock) };	\
+	     { .state = ss_lockless, .data = read_seqbegin(_seqlock) }, \
+	     *__UNIQUE_ID(ctx) __cleanup(__scoped_seqlock_cleanup_ctx) =\
+		(struct ss_tmp *)_seqlock;				\
 	     _s.state != ss_done;					\
 	     __scoped_seqlock_next(&_s, _seqlock, _target))
 
 /**
- * scoped_seqlock_read (lock, ss_state) - execute the read side critical
- *                                        section without manual sequence
- *                                        counter handling or calls to other
- *                                        helpers
- * @lock: pointer to seqlock_t protecting the data
- * @ss_state: one of {ss_lock, ss_lock_irqsave, ss_lockless} indicating
- *            the type of critical read section
+ * scoped_seqlock_read() - execute the read-side critical section
+ *                         without manual sequence counter handling
+ *                         or calls to other helpers
+ * @_seqlock: pointer to seqlock_t protecting the data
+ * @_target: an enum ss_state: one of {ss_lock, ss_lock_irqsave, ss_lockless}
+ *           indicating the type of critical read section
  *
- * Example:
+ * Example::
  *
  *     scoped_seqlock_read (&lock, ss_lock) {
  *         // read-side critical section
@@ -1323,4 +1358,8 @@ __scoped_seqlock_next(struct ss_tmp *sst, seqlock_t *lock, enum ss_state target)
 #define scoped_seqlock_read(_seqlock, _target)				\
 	__scoped_seqlock_read(_seqlock, _target, __UNIQUE_ID(seqlock))
 
+DEFINE_LOCK_GUARD_1(seqlock_init, seqlock_t, seqlock_init(_T->lock), /* */)
+DECLARE_LOCK_GUARD_1_ATTRS(seqlock_init, __acquires(_T), __releases(*(seqlock_t **)_T))
+#define class_seqlock_init_constructor(_T) WITH_LOCK_GUARD_1_ATTRS(seqlock_init, _T)
+
 #endif /* __LINUX_SEQLOCK_H */