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 <[email protected]> Signed-off-by: Mark-PK Tsai <[email protected]> Cc: YJ Chiang <[email protected]> Cc: Lecopzer Chen <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Oscar Salvador <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: [email protected] --- 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
