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authorAndi Kleen <ak@suse.de>2006-01-11 22:44:27 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:54 -0800
commitca8642f606ce22de23bae08a5044067f98de855b (patch)
tree143dd169cbba9d58629ca74d618cbfa41964c2f8 /arch/x86_64/mm/init.c
parentd25bf7e5fe73b5b6d2246ab0be08ae35d718456b (diff)
[PATCH] x86_64: Fix off by one in IOMMU check
Fix off by one when checking if the machine has enougn memory to need IOMMU This caused the IOMMUs to be needlessly enabled for mem=4G Based on a patch from Jon Mason Signed-off-by: jdmason@us.ibm.com Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/mm/init.c')
-rw-r--r--arch/x86_64/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 1faae5fc1c0..5337ca0ea7b 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -424,7 +424,7 @@ void __init mem_init(void)
#ifdef CONFIG_SWIOTLB
if (!iommu_aperture &&
- (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu))
+ ((end_pfn-1) >= 0xffffffff>>PAGE_SHIFT || force_iommu))
swiotlb = 1;
if (swiotlb)
swiotlb_init();