linux-kernel - [PATCH 07/10] x86, mce: remove for-loop in mce

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Message-ID: <4AC994D0.1020400@jp.fujitsu.com>
Date:	Mon, 05 Oct 2009 15:40:16 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Huang Ying <ying.huang@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Andi Kleen <ak@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 07/10] x86, mce: remove for-loop in mce_log

The new per-CPU buffer allows us to drop this weird code.

Note: This reverts a part of following old commit:

  commit 673242c10d535bfe238d9d8e82ac93432d35b88e
  Author: Andi Kleen <ak@...e.de>
  Date:   Mon Sep 12 18:49:24 2005 +0200
  [PATCH] x86-64: Make lockless machine check record passing a bit more robust.

(This piece originates from Huang's patch, titled:
 "x86, MCE: Fix bugs and issues of MCE log ring buffer")

Originally-From: Huang Ying <ying.huang@...el.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 arch/x86/kernel/cpu/mcheck/mce.c |   25 ++++++++-----------------
 1 files changed, 8 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index ad2eb89..87b2e29 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -146,23 +146,14 @@ void mce_log(struct mce *mce)
 
 	do {
 		entry = mcelog_cpu->next;
-		for (;;) {
-			/*
-			 * When the buffer fills up discard new entries.
-			 * Assume that the earlier errors are the more
-			 * interesting ones:
-			 */
-			if (entry >= MCE_LOG_LEN) {
-				set_bit(MCE_OVERFLOW,
-					(unsigned long *)&mcelog.flags);
-				return;
-			}
-			/* Old left over entry. Skip: */
-			if (mcelog_cpu->entry[entry].finished) {
-				entry++;
-				continue;
-			}
-			break;
+		/*
+		 * When the buffer fills up discard new entries.
+		 * Assume that the earlier errors are the more
+		 * interesting ones:
+		 */
+		if (entry >= MCE_LOG_LEN) {
+			set_bit(MCE_OVERFLOW, (unsigned long *)&mcelog.flags);
+			return;
 		}
 		smp_rmb();
 		next = entry + 1;
-- 
1.6.4.3


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