linux-kernel - [RHEL6.8 Patch 09/19] vmalloc: make find_vm

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Message-Id: <1437036437-25408-13-git-send-email-bhe@redhat.com>
Date:	Thu, 16 Jul 2015 16:47:07 +0800
From:	Baoquan He <bhe@...hat.com>
To:	linux-kernel@...r.kernel.org, ncroxon@...hat.com,
	dyoung@...hat.com, mhuang@...hat.com
Cc:	Baoquan He <bhe@...hat.com>
Subject: [RHEL6.8 Patch 09/19] vmalloc: make find_vm_area check in range

Resolves: bz1097904
https://bugzilla.redhat.com/show_bug.cgi?id=1097904

This is back ported from upstream directly.

commit cef2ac3f6c8ab532e49cf69d05f540931ad8ee64
Author: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Date:   Wed Jul 3 15:02:17 2013 -0700

    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>
    Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
    Cc: Vivek Goyal <vgoyal@...hat.com>
    Cc: Atsushi Kumagai <kumagai-atsushi@....nes.nec.co.jp>
    Cc: Lisa Mitchell <lisa.mitchell@...com>
    Cc: Zhang Yanfei <zhangyanfei@...fujitsu.com>
    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a8b83c7..2ae8618 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -302,7 +302,7 @@ 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;
-- 
2.1.0

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