From: Jan Beulich <JBeulich@novell.com>
Date: Fri, 18 Dec 2009 16:05:51 +0000 (+0000)
Subject: x86: Lift restriction on the location of FIX_BTMAP_*
X-Git-Tag: v2.6.34-rc1~252^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=499a5f1efa0b0ac56ec5d060412aed84ae68e63e;p=pandora-kernel.git

x86: Lift restriction on the location of FIX_BTMAP_*

The early ioremap fixmap entries cover half (or for 32-bit
non-PAE, a quarter) of a page table, yet they got
uncondtitionally aligned so far to a 256-entry boundary. This is
not necessary if the range of page table entries anyway falls
into a single page table.

This buys back, for (theoretically) 50% of all configurations
(25% of all non-PAE ones), at least some of the lowmem
necessarily lost with commit e621bd18958ef5dbace3129ebe17a0a475e127d9.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B2BB66F0200007800026AD6@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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