From: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Date: Wed, 19 Jun 2013 00:06:06 +0000 (+1000)
Subject: vmalloc: make find_vm_area check in range
X-Git-Tag: next-20130619~2^2~512
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ae75ec405b70de47ae7c689681a72e4ff1d4281b;p=karo-tx-linux.git

vmalloc: make find_vm_area check in range

Currently, __find_vmap_area searches for the kernel VM area starting at a
given address.  This patch changes this behavior so that it searches for
the kernel VM area to which the address belongs.  This change is needed by
remap_vmalloc_range_partial to be introduced in later patch that receives
any position of kernel VM area as target address.

This patch changes the condition (addr > va->va_start) to the equivalent
(addr >= va->va_end) by taking advantage of the fact that each kernel VM
area is non-overlapping.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp>
Cc: Lisa Mitchell <lisa.mitchell@hp.com>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d365724feb05..3875fa2f0f60 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -292,7 +292,7 @@ static struct vmap_area *__find_vmap_area(unsigned long addr)
 		va = rb_entry(n, struct vmap_area, rb_node);
 		if (addr < va->va_start)
 			n = n->rb_left;
-		else if (addr > va->va_start)
+		else if (addr >= va->va_end)
 			n = n->rb_right;
 		else
 			return va;