[PATCH] aio: add missing dcache flush

[Alexey Dobriyan <adobriyan@gmail.com>]

Ring page is mapped by kernel and updated so dcache must be flushed.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

	Not tested but the usage looks fishy.

 fs/aio.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/aio.c
+++ b/fs/aio.c
@@ -653,6 +653,7 @@ static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
 					ring = kmap_atomic(ctx->ring_pages[0]);
 					ring->id = ctx->id;
 					kunmap_atomic(ring);
+					flush_dcache_page(ctx->ring_pages[0]);
 					return 0;
 				}