From: ebiederm@xmission.com (Eric W. Biederman) This allows a valid iommu placed immediately after memory to work, to be recognized as after the last byte of memory and not overlapping it. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> --- arch/x86_64/kernel/e820.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-) diff -puN arch/x86_64/kernel/e820.c~x86_64-fix-off-by-one-in-e820_mapped arch/x86_64/kernel/e820.c --- devel/arch/x86_64/kernel/e820.c~x86_64-fix-off-by-one-in-e820_mapped 2005-07-29 13:08:31.000000000 -0700 +++ devel-akpm/arch/x86_64/kernel/e820.c 2005-07-29 13:08:31.000000000 -0700 @@ -85,7 +85,7 @@ int __init e820_mapped(unsigned long sta struct e820entry *ei = &e820.map[i]; if (type && ei->type != type) continue; - if (ei->addr >= end || ei->addr + ei->size < start) + if (ei->addr >= end || ei->addr + ei->size <= start) continue; return 1; } _