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There are cases where ECC bytes are not byte-aligned. Indeed, BCH implies using a number of ECC bits, which are not always a multiple of 8. We then need a helper like nand_extract_bits() to extract these syndromes from a buffer. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Link: https://lore.kernel.org/linux-mtd/20200519074549.23673-5-miquel.raynal@bootlin.com