linux-kernel - [PATCH -mm 6/6] rcu: introduce kfree

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Date:	Tue, 03 Mar 2009 21:44:44 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pekka Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH -mm 6/6] rcu: introduce kfree_rcu


__kfree_rcu() in slab layer(slab.c, slob.c, slub.c, slqb.c) is provided.
This patch introduce the final kfree_rcu().

Thank Manfred Spraul designed kfree_rcu()'s API.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 24c5602..2a8d5a4 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -130,6 +130,20 @@ void kfree(const void *);
 void kzfree(const void *);
 size_t ksize(const void *);
 
+struct rcu_head;
+void __kfree_rcu(const void *, struct rcu_head *);
+
+/**
+ * kfree_rcu - kfree after a grace period
+ * @ptr: pointer to kfree
+ * @rcu_member: name of the struct rcu_head member.
+ *
+ * Many rcu callbacks just call kfree() on the base structure. This helper
+ * function calls kfree internally. The rcu_head structure must be embedded
+ * in the to be freed structure.
+ */
+#define kfree_rcu(ptr, rcu_member)	__kfree_rcu((ptr), &(ptr)->rcu_member)
+
 /*
  * Allocator specific definitions. These are mainly used to establish optimized
  * ways to convert kmalloc() calls to kmem_cache_alloc() invocations by








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