Commit 508d85c2 authored Nov 16, 2009 by Yinghai Lu Committed by H. Peter Anvin Nov 17, 2009

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>

parent 5bd085b5

arch/x86/kernel/cpu/mtrr/cleanup.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -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]++;
		}

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