[PATCH v6 4/8] vmalloc: make find_vm_area check in range

HATAYAMA Daisuke d.hatayama at jp.fujitsu.com
Wed May 15 05:06:03 EDT 2013

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

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 at jp.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;
 			return va;

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