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    Subject[PATCH 4.14 12/23] block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern
    Date
    From: Haimin Zhang <tcs.kernel@gmail.com>

    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>
    ---
    block/bio.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/block/bio.c
    +++ b/block/bio.c
    @@ -1657,7 +1657,7 @@ struct bio *bio_copy_kern(struct request
    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;


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