/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

  1. #include <linux/bio.h>
  2. #include <linux/io.h>
  3. #include <xen/page.h>
  4. bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
  5. const struct bio_vec *vec2)
  6. {
  7. unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
  8. unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
  9. return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
  10. ((mfn1 == mfn2) || ((mfn1+1) == mfn2));
  11. }