[PATCH 5/6] ntdll: Round free block size to block size alignment.

[Rémi Bernon]

From: Rémi Bernon

Block sizes are now always rounded to ALIGNMENT multiple, except for
the last free block in a region. This makes it consistent and will let
us use a more compact block layout.

Signed-off-by: Rémi Bernon 
---
 dlls/ntdll/heap.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/dlls/ntdll/heap.c b/dlls/ntdll/heap.c
index cad644f2153..0d7feee189b 100644
--- a/dlls/ntdll/heap.c
+++ b/dlls/ntdll/heap.c
@@ -892,6 +892,7 @@ static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, LPVOID address, DWORD flags,
                                     SIZE_T commitSize, SIZE_T totalSize )
 {
     struct entry *pEntry;
+    SIZE_T block_size;
     SUBHEAP *subheap;
     unsigned int i;

@@ -991,9 +992,9 @@ static SUBHEAP *HEAP_CreateSubHeap( HEAP *heap, LPVOID address, DWORD flags,
         }
     }

-    /* Create the first free block */
-
-    create_free_block( subheap, first_block( subheap ), subheap_size( subheap ) - subheap_overhead( subheap ) );
+    block_size = subheap_size( subheap ) - subheap_overhead( subheap );
+    block_size &= ~(ALIGNMENT - 1);
+    create_free_block( subheap, first_block( subheap ), block_size );

return subheap;
 }