linux-kernel - [PATCH V2 1/4] vmalloc: introduce vfree

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Date:	Tue, 18 Nov 2008 16:51:03 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	David Miller <davem@...emloft.net>,
	Dave Airlie <airlied@...il.com>,
	Paul Menage <menage@...gle.com>,
	kamezawa.hiroyu@...fujitsu.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Kara <jack@...e.cz>, Jes Sorensen <jes@....com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	dada1@...mosbay.com, Alexey Dobriyan <adobriyan@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nick Piggin <npiggin@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: [PATCH V2 1/4] vmalloc: introduce vfree_atomic()


fdtable and sysipc use vfree() in RCU callback. this patch
introduce vfree_atomic() for them.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 307b885..195379a 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -60,6 +60,7 @@ extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
 				pgprot_t prot);
 extern void vfree(const void *addr);
+extern void vfree_atomic(void *addr);
 
 extern void *vmap(struct page **pages, unsigned int count,
 			unsigned long flags, pgprot_t prot);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ba6b0f5..39c164e 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -23,6 +23,7 @@
 #include <linux/rbtree.h>
 #include <linux/radix-tree.h>
 #include <linux/rcupdate.h>
+#include <linux/workqueue.h>
 
 #include <asm/atomic.h>
 #include <asm/uaccess.h>
@@ -1177,6 +1178,21 @@ void vfree(const void *addr)
 }
 EXPORT_SYMBOL(vfree);
 
+static void vfree_defer(struct work_struct *work)
+{
+	vfree(work);
+}
+
+void vfree_atomic(void *ptr)
+{
+	if (ptr) {
+		struct work_struct *work = ptr;
+		INIT_WORK(work, vfree_defer);
+		schedule_work(work);
+	}
+}
+EXPORT_SYMBOL_GPL(vfree_atomic);
+
 /**
  *	vunmap  -  release virtual mapping obtained by vmap()
  *	@addr:		memory base address

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