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rcu: Introduce 2 arg kvfree_rcu() interface 

kvmalloc() can allocate two types of objects: SLAB backed
and vmalloc backed. How it behaves depends on requested
object's size and memory pressure.

Add a kvfree_rcu() interface that can free memory allocated
via kvmalloc(). It is a simple alias to kfree_rcu() which
can now handle either type of object.

<snip>
    struct test_kvfree_rcu {
        struct rcu_head rcu;
        unsigned char array[100];
    };

    struct test_kvfree_rcu *p;

    p = kvmalloc(10 * PAGE_SIZE);
    if (p)
        kvfree_rcu(p, rcu);
<snip>

Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Co-developed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Uladzislau Rezki (Sony) 2020-05-25 23:47:57 +02:00 committed by Paul E. McKenney
parent e0feed08ab
commit ce4dce123f
1 changed files with 9 additions and 0 deletions
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9
include/linux/rcupdate.h
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@ -875,6 +875,15 @@ do { \
__kvfree_rcu(&((___p)->rhf), offsetof(typeof(*(ptr)), rhf)); \
} while (0)
/**
* kvfree_rcu() - kvfree an object after a grace period.
* @ptr: pointer to kvfree
* @rhf: the name of the struct rcu_head within the type of @ptr.
*
* Same as kfree_rcu(), just simple alias.
*/
#define kvfree_rcu(ptr, rhf) kfree_rcu(ptr, rhf)
/*
* Place this after a lock-acquisition primitive to guarantee that
* an UNLOCK+LOCK pair acts as a full barrier. This guarantee applies