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)6bool 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