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Message-ID: <176762847665.510.9431094941065565293.tip-bot2@tip-bot2>
Date: Mon, 05 Jan 2026 15:54:36 -0000
From: "tip-bot2 for Marco Elver" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Marco Elver <elver@...gle.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/seqlock: Support Clang's context analysis
The following commit has been merged into the locking/core branch of tip:
Commit-ID: 8f8a55f49cda5fee914bbea1ab5af8df3a6ba8af
Gitweb: https://git.kernel.org/tip/8f8a55f49cda5fee914bbea1ab5af8df3a6ba8af
Author: Marco Elver <elver@...gle.com>
AuthorDate: Fri, 19 Dec 2025 16:40:00 +01:00
Committer: Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 05 Jan 2026 16:43:29 +01:00
locking/seqlock: Support Clang's context analysis
Add support for Clang's context analysis for seqlock_t.
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://patch.msgid.link/20251219154418.3592607-12-elver@google.com
---
Documentation/dev-tools/context-analysis.rst | 2 +-
include/linux/seqlock.h | 38 +++++++++++++-
include/linux/seqlock_types.h | 5 +-
lib/test_context-analysis.c | 50 +++++++++++++++++++-
4 files changed, 91 insertions(+), 4 deletions(-)
diff --git a/Documentation/dev-tools/context-analysis.rst b/Documentation/dev-tools/context-analysis.rst
index 1864b6c..6905659 100644
--- a/Documentation/dev-tools/context-analysis.rst
+++ b/Documentation/dev-tools/context-analysis.rst
@@ -79,7 +79,7 @@ Supported Kernel Primitives
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Currently the following synchronization primitives are supported:
-`raw_spinlock_t`, `spinlock_t`, `rwlock_t`, `mutex`.
+`raw_spinlock_t`, `spinlock_t`, `rwlock_t`, `mutex`, `seqlock_t`.
For context locks with an initialization function (e.g., `spin_lock_init()`),
calling this function before initializing any guarded members or globals
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 2211236..1133209 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -816,6 +816,7 @@ static __always_inline void write_seqcount_latch_end(seqcount_latch_t *s)
do { \
spin_lock_init(&(sl)->lock); \
seqcount_spinlock_init(&(sl)->seqcount, &(sl)->lock); \
+ __assume_ctx_lock(sl); \
} while (0)
/**
@@ -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:
@@ -1296,9 +1322,19 @@ __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))
diff --git a/include/linux/seqlock_types.h b/include/linux/seqlock_types.h
index dfdf43e..2d5d793 100644
--- a/include/linux/seqlock_types.h
+++ b/include/linux/seqlock_types.h
@@ -81,13 +81,14 @@ SEQCOUNT_LOCKNAME(mutex, struct mutex, true, mutex)
* - Comments on top of seqcount_t
* - Documentation/locking/seqlock.rst
*/
-typedef struct {
+context_lock_struct(seqlock) {
/*
* Make sure that readers don't starve writers on PREEMPT_RT: use
* seqcount_spinlock_t instead of seqcount_t. Check __SEQ_LOCK().
*/
seqcount_spinlock_t seqcount;
spinlock_t lock;
-} seqlock_t;
+};
+typedef struct seqlock seqlock_t;
#endif /* __LINUX_SEQLOCK_TYPES_H */
diff --git a/lib/test_context-analysis.c b/lib/test_context-analysis.c
index 2b28d20..53abea0 100644
--- a/lib/test_context-analysis.c
+++ b/lib/test_context-analysis.c
@@ -6,6 +6,7 @@
#include <linux/build_bug.h>
#include <linux/mutex.h>
+#include <linux/seqlock.h>
#include <linux/spinlock.h>
/*
@@ -208,3 +209,52 @@ static void __used test_mutex_cond_guard(struct test_mutex_data *d)
d->counter++;
}
}
+
+struct test_seqlock_data {
+ seqlock_t sl;
+ int counter __guarded_by(&sl);
+};
+
+static void __used test_seqlock_init(struct test_seqlock_data *d)
+{
+ seqlock_init(&d->sl);
+ d->counter = 0;
+}
+
+static void __used test_seqlock_reader(struct test_seqlock_data *d)
+{
+ unsigned int seq;
+
+ do {
+ seq = read_seqbegin(&d->sl);
+ (void)d->counter;
+ } while (read_seqretry(&d->sl, seq));
+}
+
+static void __used test_seqlock_writer(struct test_seqlock_data *d)
+{
+ unsigned long flags;
+
+ write_seqlock(&d->sl);
+ d->counter++;
+ write_sequnlock(&d->sl);
+
+ write_seqlock_irq(&d->sl);
+ d->counter++;
+ write_sequnlock_irq(&d->sl);
+
+ write_seqlock_bh(&d->sl);
+ d->counter++;
+ write_sequnlock_bh(&d->sl);
+
+ write_seqlock_irqsave(&d->sl, flags);
+ d->counter++;
+ write_sequnlock_irqrestore(&d->sl, flags);
+}
+
+static void __used test_seqlock_scoped(struct test_seqlock_data *d)
+{
+ scoped_seqlock_read (&d->sl, ss_lockless) {
+ (void)d->counter;
+ }
+}
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