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rcu: Refactor kvfree_call_rcu() and high-level helpers

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Currently a kvfree_call_rcu() takes an offset within a structure as
a second parameter, so a helper such as a kvfree_rcu_arg_2() has to
convert rcu_head and a freed ptr to an offset in order to pass it. That
leads to an extra conversion on macro entry.

Instead of converting, refactor the code in way that a pointer that has
to be freed is passed directly to the kvfree_call_rcu().

This patch does not make any functional change and is transparent to
all kvfree_rcu() users.

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)
2022-10-25 16:46:12 +02:00
committed by Paul E. McKenney
parent 1b929c02af
commit 04a522b7da
5 changed files with 24 additions and 33 deletions
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12
include/linux/rcutiny.h
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@@ -98,25 +98,25 @@ static inline void synchronize_rcu_expedited(void)
*/
extern void kvfree(const void *addr);
static inline void __kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
static inline void __kvfree_call_rcu(struct rcu_head *head, void *ptr)
{
if (head) {
call_rcu(head, func);
call_rcu(head, (rcu_callback_t) ((void *) head - ptr));
return;
}
// kvfree_rcu(one_arg) call.
might_sleep();
synchronize_rcu();
kvfree((void *) func);
kvfree(ptr);
}
#ifdef CONFIG_KASAN_GENERIC
void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func);
void kvfree_call_rcu(struct rcu_head *head, void *ptr);
#else
static inline void kvfree_call_rcu(struct rcu_head *head, rcu_callback_t func)
static inline void kvfree_call_rcu(struct rcu_head *head, void *ptr)
{
__kvfree_call_rcu(head, func);
__kvfree_call_rcu(head, ptr);
}
#endif