[PATCH 5.10 66/70] block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern

[Greg Kroah-Hartman]

From: Haimin Zhang <tcs.kernel@xxxxxxxxx>

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@xxxxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20220216084038.15635-1-tcs.kernel@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
[nobelbarakat: Backported to 5.10: Manually added flag] 
Signed-off-by: Nobel Barakat <nobelbarakat@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 block/blk-map.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -488,7 +488,7 @@ static struct bio *bio_copy_kern(struct
 		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;