Re: mtd: kernel BUG at arch/x86/mm/pat.c:279!
From: "H. Peter Anvin" <hpa@zytor.com>
Date: 2012-09-09 20:33:56
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On 09/09/2012 12:04 PM, David Woodhouse wrote:
On Sun, 2012-09-09 at 09:56 -0700, H. Peter Anvin wrote:quoted
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So it should either be start=0xfffffffffffff000 end=0xffffffffffffffff or it should be start=0xfffffffffffff000 len=0x1000.I would strongly object to the former; that kind of inclusive ranges breed a whole class of bugs by themselves.Another alternative that avoids overflow issues is to use a PFN rather than a byte address.
Except as a result of that logic have a bunch of places which either have rounding errors in how they calculate PFNs, or they think they can stick PFNs into 32-bit numbers. :( -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>