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 d365724feb05206fc0b37c852f5859499f1cb6b3..3875fa2f0f603fe37fa069817c086489aab03914 100644 (file)
--- 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;