[PATCH m68k resent] allow ioremapping top of memory

[PATCH m68k resent] allow ioremapping top of memory

[Philippe De Muyter]

Hi Geert and all,

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>

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

Re: [PATCH m68k resent] allow ioremapping top of memory

[Geert Uytterhoeven]

On Sun, Dec 6, 2009 at 20:28, Philippe De Muyter <phdm@macqel.be> wrote:
> 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.

Thanks, will take it.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds