linux-kernel - [PATCH v6 4/8] vmalloc: make find_vm

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Message-ID: <20130515090602.28109.90142.stgit@localhost6.localdomain6>
Date:	Wed, 15 May 2013 18:06:03 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	vgoyal@...hat.com, ebiederm@...ssion.com, akpm@...ux-foundation.org
Cc:	cpw@....com, kumagai-atsushi@....nes.nec.co.jp,
	lisa.mitchell@...com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, zhangyanfei@...fujitsu.com,
	jingbai.ma@...com, linux-mm@...ck.org, riel@...hat.com,
	walken@...gle.com, hughd@...gle.com, kosaki.motohiro@...fujitsu.com
Subject: [PATCH v6 4/8] 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@...fujitsu.com>
---

 mm/vmalloc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d365724..3875fa2 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;

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