From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/xen/biomerge.c | 23 +++++++++++++++++++++++ 1 file changed, 23 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 0000000000..05a286d24f --- /dev/null +++ b/drivers/xen/biomerge.c @@ -0,0 +1,23 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include + +/* check if @page can be merged with 'vec1' */ +bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, + const struct page *page) +{ +#if XEN_PAGE_SIZE == PAGE_SIZE + unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); + unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page)); + + return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; +#else + /* + * XXX: Add support for merging bio_vec when using different page + * size in Xen and Linux. + */ + return false; +#endif +} -- cgit v1.2.3