[PATCH] x86_64: Fix off by one in e820_mapped

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>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index b548dea4e5b95e30c01f369f0c95dcd06db67551..116ac5f53dced70d0098178e57b7e09207d90603 100644 (file)
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -85,7 +85,7 @@ int __init e820_mapped(unsigned long start, unsigned long end, unsigned type)
                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; 
        }