Messages in this thread | | | Date | Fri, 11 Jun 2010 10:43:27 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 2/4] x86: ioremap: fix physical address check |
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On 06/11/2010 02:20 AM, Kenji Kaneshige wrote: > If the physical address is too high to be handled by ioremap() in > x86_32 PAE (e.g. more than 36-bit physical address), ioremap() must > return error (NULL). However, current x86 ioremap try to map this too > high physical address, and it causes unexpected behavior.
What unexpected behavior? It is perfectly legitimately to map such a high address in PAE mode. We have a 36-bit kernel-imposed limit on *RAM* in 32-bit mode (because we can't manage more than that), but there is no reason it should apply to I/O.
-hpa
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