Messages in this thread | | | Date | Mon, 20 Jun 2011 15:37:33 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 1/3] x86: calculate precisely the memory needed by init_memory_mapping |
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On 06/07/2011 11:13 AM, stefano.stabellini@eu.citrix.com wrote: > > - remove the extra page added on x86_32 for the fixmap because is not > needed: the PMD entry is already allocated and contiguous for the whole > range (a PMD page covers 4G of virtual addresses) and the pte entry is > already allocated by early_ioremap_init. >
Hi Stefano,
I think this is wrong. A PMD page covers *1G* of virtual addresses, and in the 2+2 and 1+3 memory configurations, we may or may not need a separate PMD for the fixmap.
Am I missing something?
-hpa
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