From 5130b8fd06901c1b3a4bd0d0f5c5ea99b2b0a6f0 Mon Sep 17 00:00:00 2001 From: "Uladzislau Rezki (Sony)" Date: Fri, 20 Nov 2020 12:49:16 +0100 Subject: [PATCH] rcu: Introduce kfree_rcu() single-argument macro There is a kvfree_rcu() single argument macro that handles pointers returned by kvmalloc(). Even though it also handles pointer returned by kmalloc(), readability suffers. This commit therefore updates the kfree_rcu() macro to explicitly pair with kmalloc(), thus improving readability. Signed-off-by: Uladzislau Rezki (Sony) Signed-off-by: Paul E. McKenney --- include/linux/rcupdate.h | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index de0826411311..b95373ea3b02 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -851,8 +851,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) /** * kfree_rcu() - kfree an object after a grace period. - * @ptr: pointer to kfree - * @rhf: the name of the struct rcu_head within the type of @ptr. + * @ptr: pointer to kfree for both single- and double-argument invocations. + * @rhf: the name of the struct rcu_head within the type of @ptr, + * but only for double-argument invocations. * * Many rcu callbacks functions just call kfree() on the base structure. * These functions are trivial, but their size adds up, and furthermore @@ -875,13 +876,7 @@ static inline notrace void rcu_read_unlock_sched_notrace(void) * The BUILD_BUG_ON check must not involve any function calls, hence the * checks are done in macros here. */ -#define kfree_rcu(ptr, rhf) \ -do { \ - typeof (ptr) ___p = (ptr); \ - \ - if (___p) \ - __kvfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \ -} while (0) +#define kfree_rcu kvfree_rcu /** * kvfree_rcu() - kvfree an object after a grace period. @@ -913,7 +908,14 @@ do { \ kvfree_rcu_arg_2, kvfree_rcu_arg_1)(__VA_ARGS__) #define KVFREE_GET_MACRO(_1, _2, NAME, ...) NAME -#define kvfree_rcu_arg_2(ptr, rhf) kfree_rcu(ptr, rhf) +#define kvfree_rcu_arg_2(ptr, rhf) \ +do { \ + typeof (ptr) ___p = (ptr); \ + \ + if (___p) \ + __kvfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \ +} while (0) + #define kvfree_rcu_arg_1(ptr) \ do { \ typeof(ptr) ___p = (ptr); \ -- 2.11.0