From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe De Muyter <phdm@macqel.be>
Subject: [PATCH] m68k allow ioremapping top of memory
Date: Thu, 22 Oct 2009 15:54:54 +0200
Message-ID: <20091022135454.GA27903@frolo.macqel>
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Hi all,

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

Signed-off-by: Philippe De Muyter <phdm@macqel.be>

diff --git a/arch/m68k/mm/kmap.c b/arch/m68k/mm/kmap.c
--- a/arch/m68k/mm/kmap.c
+++ b/arch/m68k/mm/kmap.c
@@ -116,7 +115,7 @@ void __iomem *__ioremap(unsigned long ph
 	/*
 	 * Don't allow mappings that wrap..
 	 */
-	if (!size || size > physaddr + size)
+	if (!size || physaddr > (unsigned long)(-size))
 		return NULL;
 
 #ifdef CONFIG_AMIGA