linux-kernel - Re: [PATCH buf-fix] kernel, range: fix broken mtrr

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Message-ID: <A98DEB4ACFCFC841976D4371742E02E07623124C@EXMBX-SZ003.tencent.com>
Date:	Thu, 13 Jun 2013 02:18:29 +0000
From:	samuelliao(廖生苗) <samuelliao@...cent.com>
To:	Yinghai Lu <yinghai@...nel.org>, Shan Wei <shanwei88@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Lin Feng <linfeng@...fujitsu.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Kernel-Maillist <linux-kernel@...r.kernel.org>,
	davidshan(单卫) <davidshan@...cent.com>
Subject: Re: [PATCH buf-fix] kernel, range: fix broken mtrr_cleanup(Internet
 mail)

I forget change final_start/final_end to start/end.  The old code add empty range in following case:

Before mtrr cleanup:
1. got initial MTRR range: 0-3G.
2. MTRR code try to merge 0-1M
3. result is 0-0, 0-3G,  total 2 range count

After cleanup:
1. got final MTRR range: 0-3G, total 1 range count

the cleanup code failed, because range count mismatch.