From 2ebe31513fcbe7a781f27002f065b50ae195022f Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Sat, 19 Sep 2009 07:34:04 -0700 Subject: [PATCH] intel-iommu: Limit DOMAIN_MAX_PFN to fit in an 'unsigned long' This means we're limited to 44-bit addresses on 32-bit kernels, and makes it sane for us to use 'unsigned long' for PFNs throughout. Which is just as well, really, since we already do that. Reported-by: Benjamin LaHaise Tested-by: Benjamin LaHaise Signed-off-by: David Woodhouse --- drivers/pci/intel-iommu.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 2ec5899207e3..c9272a1fb691 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -56,8 +56,14 @@ #define MAX_AGAW_WIDTH 64 -#define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1) -#define DOMAIN_MAX_PFN(gaw) ((((u64)1) << (gaw-VTD_PAGE_SHIFT)) - 1) +#define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1) +#define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1) + +/* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR + to match. That way, we can use 'unsigned long' for PFNs with impunity. */ +#define DOMAIN_MAX_PFN(gaw) ((unsigned long) min_t(uint64_t, \ + __DOMAIN_MAX_PFN(gaw), (unsigned long)-1)) +#define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT) #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) #define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32)) -- GitLab