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authorStefano Stabellini <stefano.stabellini@xilinx.com>2020-07-11 01:34:24 +0300
committerJuergen Gross <jgross@suse.com>2020-08-04 08:50:43 +0300
commite9aab7e4ffbbf6eba8eaa66e351557c0c7562cff (patch)
treebebc46a35a39de199910b2abc93378d40b577ead
parent38ba51de46767cbcef04305c3e8a99f0965fc9df (diff)
downloadlinux-e9aab7e4ffbbf6eba8eaa66e351557c0c7562cff.tar.xz
swiotlb-xen: remove XEN_PFN_PHYS
XEN_PFN_PHYS is only used in one place in swiotlb-xen making things more complex than need to be. Remove the definition of XEN_PFN_PHYS and open code the cast in the one place where it is needed. Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20200710223427.6897-8-sstabellini@kernel.org Signed-off-by: Juergen Gross <jgross@suse.com>
-rw-r--r--drivers/xen/swiotlb-xen.c7
-rw-r--r--include/xen/page.h1
2 files changed, 1 insertions, 7 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index e2c35f45f91e..03d118b6c141 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -52,11 +52,6 @@ static unsigned long xen_io_tlb_nslabs;
* Quick lookup value of the bus address of the IOTLB.
*/
-/*
- * Both of these functions should avoid XEN_PFN_PHYS because phys_addr_t
- * can be 32bit when dma_addr_t is 64bit leading to a loss in
- * information if the shift is done before casting to 64bit.
- */
static inline dma_addr_t xen_phys_to_bus(struct device *dev, phys_addr_t paddr)
{
unsigned long bfn = pfn_to_bfn(XEN_PFN_DOWN(paddr));
@@ -101,7 +96,7 @@ static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
{
unsigned long bfn = XEN_PFN_DOWN(dma_addr);
unsigned long xen_pfn = bfn_to_local_pfn(bfn);
- phys_addr_t paddr = XEN_PFN_PHYS(xen_pfn);
+ phys_addr_t paddr = (phys_addr_t)xen_pfn << XEN_PAGE_SHIFT;
/* If the address is outside our domain, it CAN
* have the same virtual address as another address
diff --git a/include/xen/page.h b/include/xen/page.h
index df6d6b6ec66e..285677b42943 100644
--- a/include/xen/page.h
+++ b/include/xen/page.h
@@ -24,7 +24,6 @@
#define XEN_PFN_DOWN(x) ((x) >> XEN_PAGE_SHIFT)
#define XEN_PFN_UP(x) (((x) + XEN_PAGE_SIZE-1) >> XEN_PAGE_SHIFT)
-#define XEN_PFN_PHYS(x) ((phys_addr_t)(x) << XEN_PAGE_SHIFT)
#include <asm/xen/page.h>