diff options
| author | Marco Elver <elver@google.com> | 2026-01-19 10:05:52 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-01-28 20:45:24 +0100 |
| commit | d084a73714f818ce509022e1aa9483cabf797c16 (patch) | |
| tree | a6267c99ccbf07913d353a9ab91d09f4161c6619 /include/linux/seqlock.h | |
| parent | 3b9ed30344a866f6f96896b3ce64303b9074682b (diff) | |
compiler-context-analysis: Introduce scoped init guards
Add scoped init guard definitions for common synchronization primitives
supported by context analysis.
The scoped init guards treat the context as active within initialization
scope of the underlying context lock, given initialization implies
exclusive access to the underlying object. This allows initialization of
guarded members without disabling context analysis, while documenting
initialization from subsequent usage.
The documentation is updated with the new recommendation. Where scoped
init guards are not provided or cannot be implemented (ww_mutex omitted
for lack of multi-arg guard initializers), the alternative is to just
disable context analysis where guarded members are initialized.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20251212095943.GM3911114@noisy.programming.kicks-ass.net/
Link: https://patch.msgid.link/20260119094029.1344361-3-elver@google.com
Diffstat (limited to 'include/linux/seqlock.h')
| -rw-r--r-- | include/linux/seqlock.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h index c00063dffba3..077c8d5b2afd 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> @@ -1358,4 +1359,8 @@ static __always_inline void __scoped_seqlock_cleanup_ctx(struct ss_tmp **s) #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 */ |