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lib: sbi_locks: annotate spinlock APIs for TSA

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Add Thread Safety Analysis (TSA) annotations for spinlock APIs, allowing
the compiler to reason about lock acquisition and release.

Annotations have a different meaning if used in header declarations vs C
file implementations. In header declarations, they specify the semantics
of the given function, meaning that we must specify that the spinlock
functions acquire and release a lock ("capability" in clang terms).
In function implementations, attributes affect the function body and
callers in the same translation unit; since the spinlock functions
contain inline assembly, they must be excluded from analysis.

Signed-off-by: Carlos López <carlos.lopezr4096@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260909162322.29778-4-carlos.lopezr4096@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Carlos López
2026-09-16 09:48:30 +05:30
committed by Anup Patel
parent 8d109c7e87
commit b8f7e9ea80
2 changed files with 6 additions and 6 deletions
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include/sbi/riscv_locks.h
+4 -4
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@@ -20,7 +20,7 @@ typedef struct {
u16 owner;
u16 next;
#endif
} __aligned(4) spinlock_t;
} __aligned(4) CAPABILITY("spinlock") spinlock_t;
#define __SPIN_LOCK_UNLOCKED \
(spinlock_t) { 0, 0 }
@@ -36,10 +36,10 @@ typedef struct {
bool spin_lock_check(spinlock_t *lock);
bool spin_trylock(spinlock_t *lock);
bool spin_trylock(spinlock_t *lock) TRY_ACQUIRE(true, *lock);
void spin_lock(spinlock_t *lock);
void spin_lock(spinlock_t *lock) ACQUIRE(*lock) MUST_NOT_HOLD(*lock);
void spin_unlock(spinlock_t *lock);
void spin_unlock(spinlock_t *lock) RELEASE(*lock);
#endif