linux/drivers/xen/biomerge.c
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   1#include <linux/bio.h>
   2#include <linux/io.h>
   3#include <linux/export.h>
   4#include <xen/page.h>
   5
   6bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
   7                               const struct bio_vec *vec2)
   8{
   9        unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
  10        unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
  11
  12        return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
  13                ((mfn1 == mfn2) || ((mfn1+1) == mfn2));
  14}
  15EXPORT_SYMBOL(xen_biovec_phys_mergeable);
  16
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