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1// SPDX-License-Identifier: GPL-2.02#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' */8bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,9 const struct page *page)10{11#if XEN_PAGE_SIZE == PAGE_SIZE12 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#else17 /*18 * XXX: Add support for merging bio_vec when using different page19 * size in Xen and Linux.20 */21 return false;22#endif23}24