/drivers/xen/biomerge.c
https://bitbucket.org/slukk/jb-tsm-kernel-4.2 · C · 13 lines · 11 code · 2 blank · 0 comment · 3 complexity · ead1cc36d68de979443a11e56f90e42c MD5 · raw file
- #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));
- }