This is a note to let you know that I've just added the patch titled
xen/swiotlb: simplify range_straddles_page_boundary()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-swiotlb-simplify-range_straddles_page_boundary.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 997d62e4f01fb8bdf0a44dacb4e05fea0f8f3210
Author: Juergen Gross <jgross@xxxxxxxx>
Date: Fri Jun 14 07:46:03 2019 +0200
xen/swiotlb: simplify range_straddles_page_boundary()
[ Upstream commit bf70726668c6116aa4976e0cc87f470be6268a2f ]
range_straddles_page_boundary() is open coding several macros from
include/xen/page.h. Use those instead. Additionally there is no need
to have check_pages_physically_contiguous() as a separate function as
it is used only once, so merge it into range_straddles_page_boundary().
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Stable-dep-of: 9f40ec84a797 ("xen/swiotlb: add alignment check for dma buffers")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 3d9997595d900..2f4d4e36c7b36 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -94,34 +94,18 @@ static inline dma_addr_t xen_virt_to_bus(void *address)
return xen_phys_to_bus(virt_to_phys(address));
}
-static int check_pages_physically_contiguous(unsigned long xen_pfn,
- unsigned int offset,
- size_t length)
+static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
{
- unsigned long next_bfn;
- int i;
- int nr_pages;
+ unsigned long next_bfn, xen_pfn = XEN_PFN_DOWN(p);
+ unsigned int i, nr_pages = XEN_PFN_UP(xen_offset_in_page(p) + size);
next_bfn = pfn_to_bfn(xen_pfn);
- nr_pages = (offset + length + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT;
- for (i = 1; i < nr_pages; i++) {
+ for (i = 1; i < nr_pages; i++)
if (pfn_to_bfn(++xen_pfn) != ++next_bfn)
- return 0;
- }
- return 1;
-}
+ return 1;
-static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
-{
- unsigned long xen_pfn = XEN_PFN_DOWN(p);
- unsigned int offset = p & ~XEN_PAGE_MASK;
-
- if (offset + size <= XEN_PAGE_SIZE)
- return 0;
- if (check_pages_physically_contiguous(xen_pfn, offset, size))
- return 0;
- return 1;
+ return 0;
}
static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
