[PATCH] mm/sparse: fix ALIGN() without power of 2 in sparse_buffer_alloc()

[Lecopzer Chen]

The size argumnet passed into sparse_buffer_alloc() has already
aligned with PAGE_SIZE or PMD_SIZE.

If the size after aligned is not power of 2 (e.g. 0x480000), the
PTR_ALIGN() will return wrong value.
Use roundup to round sparsemap_buf up to next multiple of size.

Signed-off-by: Lecopzer Chen <lecopzer.chen@xxxxxxxxxxxx>
Signed-off-by: Mark-PK Tsai <Mark-PK.Tsai@xxxxxxxxxxxx>
Cc: YJ Chiang <yj.chiang@xxxxxxxxxxxx>
Cc: Lecopzer Chen <lecopzer.chen@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 mm/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 2b3b5be85120..dafd130f9a55 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -459,7 +459,7 @@ void * __meminit sparse_buffer_alloc(unsigned long size)
 	void *ptr = NULL;
 
 	if (sparsemap_buf) {
-		ptr = PTR_ALIGN(sparsemap_buf, size);
+		ptr = (void *) roundup((unsigned long)sparsemap_buf, size);
 		if (ptr + size > sparsemap_buf_end)
 			ptr = NULL;
 		else {
-- 
2.18.0