1 #include <linux/bio.h>
2 #include <linux/io.h>
3 #include <linux/export.h>
4 #include <xen/page.h>
5 
xen_biovec_phys_mergeable(const struct bio_vec * vec1,const struct bio_vec * vec2)6 bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
7 			       const struct bio_vec *vec2)
8 {
9 	unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
10 	unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
11 
12 	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
13 		((mfn1 == mfn2) || ((mfn1+1) == mfn2));
14 }
15 EXPORT_SYMBOL(xen_biovec_phys_mergeable);
16