From: Philippe De Muyter <phdm@macqel.be>
Date: Sun, 6 Dec 2009 19:28:41 +0000 (+0100)
Subject: m68k: Allow ioremapping top of memory
X-Git-Tag: v2.6.34-rc1~267^2~22
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=88cb773c5f8e45e48f3a89480610448974337cb0;p=karo-tx-linux.git

m68k: Allow ioremapping top of memory

The test in __ioremap to reject memory ranges crossing the 0 boundary
rejects also memory ranges ending at the end of the memory.  Fix that.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---

diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
index df620ac2a296..cf93cdd515c5 100644
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -116,7 +116,7 @@ void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cachefla
 	/*
 	 * Don't allow mappings that wrap..
 	 */
-	if (!size || size > physaddr + size)
+	if (!size || physaddr > (unsigned long)(-size))
 		return NULL;
 
 #ifdef CONFIG_AMIGA