diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/xen/Makefile | 2 | ||||
| -rw-r--r-- | drivers/xen/biomerge.c | 13 |
2 files changed, 14 insertions, 1 deletions
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index fcaf838f54be..b47f5da674d3 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -1,4 +1,4 @@ -obj-y += grant-table.o features.o events.o manage.o +obj-y += grant-table.o features.o events.o manage.o biomerge.o obj-y += xenbus/ nostackp := $(call cc-option, -fno-stack-protector) diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c new file mode 100644 index 000000000000..ba6eda4b5143 --- /dev/null +++ b/drivers/xen/biomerge.c @@ -0,0 +1,13 @@ +#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)); +} |