/drivers/xen/biomerge.c
C | 13 lines | 11 code | 2 blank | 0 comment | 3 complexity | ead1cc36d68de979443a11e56f90e42c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- #include <linux/bio.h>
- #include <linux/io.h>
- #include <xen/page.h>
- bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
- const struct bio_vec *vec2)
- {
- unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
- unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
- return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
- ((mfn1 == mfn2) || ((mfn1+1) == mfn2));
- }