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locking/percpu-rwsem: Add guard support

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To simplify the usage of the percpu rw semaphore.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250314172700.438923-2-kan.liang@linux.intel.com
This commit is contained in:
Peter Zijlstra (Intel)
2025-03-14 10:26:55 -07:00
committed by Peter Zijlstra
parent cb43691293
commit fdfda868ee
1 changed files with 8 additions and 0 deletions
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8
include/linux/percpu-rwsem.h
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@@ -8,6 +8,7 @@
#include <linux/wait.h>
#include <linux/rcu_sync.h>
#include <linux/lockdep.h>
#include <linux/cleanup.h>
struct percpu_rw_semaphore {
struct rcu_sync rss;
@@ -125,6 +126,13 @@ extern bool percpu_is_read_locked(struct percpu_rw_semaphore *);
extern void percpu_down_write(struct percpu_rw_semaphore *);
extern void percpu_up_write(struct percpu_rw_semaphore *);
DEFINE_GUARD(percpu_read, struct percpu_rw_semaphore *,
percpu_down_read(_T), percpu_up_read(_T))
DEFINE_GUARD_COND(percpu_read, _try, percpu_down_read_trylock(_T))
DEFINE_GUARD(percpu_write, struct percpu_rw_semaphore *,
percpu_down_write(_T), percpu_up_write(_T))
static inline bool percpu_is_write_locked(struct percpu_rw_semaphore *sem)
{
return atomic_read(&sem->block);