linux-kernel - [PATCH] m68k allow ioremapping top of memory

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Date:	Thu, 22 Oct 2009 15:54:54 +0200
From:	Philippe De Muyter <phdm@...qel.be>
To:	linux-kernel@...r.kernel.org, linux-m68k@...r.kernel.org
Subject: [PATCH] m68k allow ioremapping top of memory

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@...qel.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
--
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