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rcu: Introduce kfree_rcu() single-argument macro

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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) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2020-11-20 12:49:16 +01:00 • committed by Paul E. McKenney
parent 84109ab585
commit 5130b8fd06
1 changed files with 12 additions and 10 deletions
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22
include/linux/rcupdate.h
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@ -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); \