3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
commit c884227eaae9936f8ecbde6e1387bccdab5f4e90 upstream.
On x86 truncation cannot occur because config XEN depends on X86_64 ||
(X86_32 && X86_PAE).
On ARM truncation can occur without CONFIG_ARM_LPAE, when the dma
operation involves foreign grants. However in that case the physical
address returned by xen_bus_to_phys is actually invalid (there is no mfn
to pfn tracking for foreign grants on ARM) and it is not used.
Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Reviewed-by: Catalin Marinas <catalin.mari...@arm.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/xen/swiotlb-xen.c | 2 --
1 file changed, 2 deletions(-)
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -96,8 +96,6 @@ static inline phys_addr_t xen_bus_to_phy
dma_addr_t dma = (dma_addr_t)pfn << PAGE_SHIFT;
phys_addr_t paddr = dma;
- BUG_ON(paddr != dma); /* truncation has occurred, should never happen */
-
paddr |= baddr & ~PAGE_MASK;
return paddr;
--
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