Merge tag 'iwlwifi-next-for-kalle-2014-12-30' of https://git.kernel.org/pub/scm/linux...
[cascardo/linux.git] / drivers / xen / biomerge.c
1 #include <linux/bio.h>
2 #include <linux/io.h>
3 #include <linux/export.h>
4 #include <xen/page.h>
5
6 bool 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 }
15 EXPORT_SYMBOL(xen_biovec_phys_mergeable);