Cregit: biomerge.c

Contributors: 7
Author	Tokens	Token Proportion	Commits	Commit Proportion
Jeremy Fitzhardinge	56	60.87%	1	12.50%
Julien Grall	17	18.48%	2	25.00%
Roger Pau Monné	9	9.78%	1	12.50%
Matthew Wilcox	5	5.43%	1	12.50%
Stephen Rothwell	3	3.26%	1	12.50%
Gustavo A. R. Silva	1	1.09%	1	12.50%
Greg Kroah-Hartman	1	1.09%	1	12.50%
Total	92		8

// SPDX-License-Identifier: GPL-2.0
#include <linux/bio.h>
#include <linux/io.h>
#include <linux/export.h>
#include <xen/page.h>

bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
			       const struct bio_vec *vec2)
{
#if XEN_PAGE_SIZE == PAGE_SIZE
	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));

	return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
#else
	/*
	 * XXX: Add support for merging bio_vec when using different page
	 * size in Xen and Linux.
	 */
	return false;
#endif
}
EXPORT_SYMBOL(xen_biovec_phys_mergeable);