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x86: When cleaning MTRRs, do not fold WP into UC 

The current MTRR code treats WP as a form of UC.  This really isn't
desirable behaviour, except possibly in the case of severe MTRR
shortage.  Disable this, to allow legitimate uses of WP to remain
unmolested.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Yinghai Lu 2009-11-16 23:04:56 -08:00 committed by H. Peter Anvin
parent 5bd085b5fb
commit 508d85c2c6
1 changed files with 0 additions and 2 deletions
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2
arch/x86/kernel/cpu/mtrr/cleanup.c
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@ -689,8 +689,6 @@ static int __init mtrr_need_cleanup(void)
continue;
if (!size)
type = MTRR_NUM_TYPES;
if (type == MTRR_TYPE_WRPROT)
type = MTRR_TYPE_UNCACHABLE;
num[type]++;
}