1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/bio.h> 3 #include <linux/export.h> 4 #include <xen/xen.h> 5 #include <xen/page.h> 6 7 /* check if @page can be merged with 'vec1' */ xen_biovec_phys_mergeable(const struct bio_vec * vec1,const struct page * page)8bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 9 const struct page *page) 10 { 11 #if XEN_PAGE_SIZE == PAGE_SIZE 12 unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); 13 unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page)); 14 15 return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; 16 #else 17 /* 18 * XXX: Add support for merging bio_vec when using different page 19 * size in Xen and Linux. 20 */ 21 return false; 22 #endif 23 } 24