From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- drivers/xen/biomerge.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 drivers/xen/biomerge.c (limited to 'drivers/xen/biomerge.c') diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c new file mode 100644 index 00000000..0edb91c0 --- /dev/null +++ b/drivers/xen/biomerge.c @@ -0,0 +1,15 @@ +#include +#include +#include +#include + +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)); +} +EXPORT_SYMBOL(xen_biovec_phys_mergeable); -- cgit v1.3.1