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Date: Tue, 13 Jan 2015 23:22:50 -0800 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Stefano Stabellini <stefano.stabellini@...citrix.com>, Catalin Marinas <catalin.marinas@....com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [PATCH 3.14 10/77] swiotlb-xen: remove BUG_ON in xen_bus_to_phys 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefano Stabellini <stefano.stabellini@...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.stabellini@...citrix.com> Reviewed-by: Catalin Marinas <catalin.marinas@....com> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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