From: Haimin Zhang <tcs.kernel@gmail.com>
Date: Wed, 16 Feb 2022 08:40:38 +0000 (+0800)
Subject: block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern
X-Git-Tag: v4.9.317~8
X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=d59073bedb7cf752b8cd4027dd0f67cf7ac4330f;p=wrapfs-4.9.y.git

block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern

commit cc8f7fe1f5eab010191aa4570f27641876fa1267 upstream.

Add __GFP_ZERO flag for alloc_page in function bio_copy_kern to initialize
the buffer of a bio.

Signed-off-by: Haimin Zhang <tcs.kernel@gmail.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220216084038.15635-1-tcs.kernel@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
[DP: Backported to 4.19: Manually added __GFP_ZERO flag]
Signed-off-by: Dragos-Marian Panait <dragos.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/block/bio.c b/block/bio.c
index 4c18a68913de..db3723675f5a 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1538,7 +1538,7 @@ struct bio *bio_copy_kern(struct request_queue *q, void *data, unsigned int len,
 		if (bytes > len)
 			bytes = len;
 
-		page = alloc_page(q->bounce_gfp | gfp_mask);
+		page = alloc_page(q->bounce_gfp | __GFP_ZERO | gfp_mask);
 		if (!page)
 			goto cleanup;