Commit fdfda868 authored by Peter Zijlstra (Intel)'s avatar Peter Zijlstra (Intel) Committed by Peter Zijlstra
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locking/percpu-rwsem: Add guard support 



To simplify the usage of the percpu rw semaphore.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarKan Liang <kan.liang@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250314172700.438923-2-kan.liang@linux.intel.com
parent cb436912

include/linux/percpu-rwsem.h

+8 −0
Original line number Diff line number Diff line
@@ -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);