linux-kernel - [PATCH] aio: add missing dcache flush

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Message-ID: <YJRLAPfYuNaCWq6T@localhost.localdomain>
Date:   Thu, 6 May 2021 23:01:04 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     bcrl@...ck.org, akpm@...ux-foundation.org
Cc:     linux-aio@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] aio: add missing dcache flush

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

Signed-off-by: Alexey Dobriyan <adobriyan@...il.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;
 				}