is_vmalloc_addr(): Check if an address is within the vmalloc boundaries

Checking if an address is a vmalloc address is done in a couple of places.
Define a common version in mm.h and replace the other checks.

Again the include structures suck.  The definition of VMALLOC_START and
VMALLOC_END is not available in vmalloc.h since highmem.c cannot be included
there.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 4 deletions

diff --git a/fs/xfs/linux-2.6/kmem.c b/fs/xfs/linux-2.6/kmem.c
index ed2b16dff914..e040f1ce1b6a 100644
--- a/fs/xfs/linux-2.6/kmem.c
+++ b/fs/xfs/linux-2.6/kmem.c
@@ -92,8 +92,7 @@ kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize,
 void
 kmem_free(void *ptr, size_t size)
 {
-        if (((unsigned long)ptr < VMALLOC_START) ||
-            ((unsigned long)ptr >= VMALLOC_END)) {
+        if (!is_vmalloc_addr(ptr)) {
                 kfree(ptr);
         } else {
                 vfree(ptr);
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index a49dd8d4b069..0382c19d6523 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -709,8 +709,7 @@ static inline struct page *
 mem_to_page(
         void                    *addr)
 {
-        if (((unsigned long)addr < VMALLOC_START) ||
-            ((unsigned long)addr >= VMALLOC_END)) {
+        if ((!is_vmalloc_addr(addr))) {
                 return virt_to_page(addr);
         } else {
                 return vmalloc_to_page(addr);