On Thu, Apr 21 2005, Guennadi Liakhovetski wrote:
> +static void *dc390_kmap_atomic_sg(struct scatterlist *sg, int sg_count, size_t offset, size_t *len)
> +{
> + int i;
> + size_t sg_len = 0;
> +
> + for (i = 0; i < sg_count; i++) {
> + sg_len += sg[i].length;
> + if (sg_len > offset)
> + break;
> + }
> +
> + BUG_ON(i == sg_count);
> +
> + *len = sg_len - offset;
> +
> + return kmap_atomic(sg[i].page, KM_BIO_SRC_IRQ) + sg[i].offset + sg[i].length - *len;
> +}
> +
> +static void dc390_kunmap_atomic_sg(void *virt)
> +{
> + kunmap_atomic(virt_to_page(virt), KM_BIO_SRC_IRQ);
> +}
Please remember to test this with highmem debug. The above is buggy,
kunmap_atomic() takes the mapped pointer, not the page structure.
--
Jens Axboe
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