linux-kernel - [PATCH V2 2/4] mm: introduce kvfree

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Message-ID: <492281FE.4000301@cn.fujitsu.com>
Date:	Tue, 18 Nov 2008 16:51:10 +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 2/4] mm: introduce kvfree_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/mm.h b/include/linux/mm.h
index ff89388..aa7b5ca 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -280,6 +280,7 @@ static inline int is_vmalloc_addr(const void *x)
 
 void *kvmalloc(unsigned long size, gfp_t flags);
 void kvfree(void *ptr);
+void kvfree_atomic(void *ptr);
 
 static inline struct page *compound_head(struct page *page)
 {
diff --git a/mm/util.c b/mm/util.c
index 66d1a12..ed2d317 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -197,6 +197,15 @@ void kvfree(void *ptr)
 }
 EXPORT_SYMBOL(kvfree);
 
+void kvfree_atomic(void *ptr)
+{
+	if (is_vmalloc_addr(ptr))
+		vfree_atomic(ptr);
+	else
+		kfree(ptr);
+}
+EXPORT_SYMBOL(kvfree_atomic);
+
 #ifndef HAVE_ARCH_PICK_MMAP_LAYOUT
 void arch_pick_mmap_layout(struct mm_struct *mm)
 {

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