Commit c7337efd authored Feb 16, 2022 by Haimin Zhang Committed by Greg Kroah-Hartman May 12, 2022

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>
[nobelbarakat: Backported to 5.4: Manually added __GFP_ZERO flag]
Signed-off-by: Nobel Barakat <nobelbarakat@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 9588ac2e

block/bio.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1627,7 +1627,7 @@ 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;