From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 16 Dec 2008 18:23:36 +0000 (+0100)
Subject: x86, mm: limit MAXMEM on 64-bit
X-Git-Tag: v2.6.29-rc1~587^2~4^17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b6fd6f26733e864fba2ea3eb1d716e23d2e66f3a;p=pandora-kernel.git

x86, mm: limit MAXMEM on 64-bit

on 64-bit x86 the physical memory limit is controlled by the sparsemem
bits - which are 44 bits right now. But MAXMEM (the max pfn number
e820 parsing will allow to enter our sizing routines) is set to
0x00003fffffffffff, i.e. 46 bits - that's too large because it overlaps
into the vmalloc range.

So couple MAXMEM to MAX_PHYSMEM_BITS, and add a comment that the
maximum of MAX_PHYSMEM_BITS is 45 bits.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
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