linux-kernel - [PATCH 10/12] x86, mce: cleanup mce

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Date:	Fri, 27 May 2011 13:11:34 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
CC:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH 10/12] x86, mce: cleanup mce_read

Use temporary local entry to make code simple.
No change in logic.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
---
 arch/x86/kernel/cpu/mcheck/mce.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 9fe9e6e..4ba4040 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1533,18 +1533,17 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
 	do {
 		for (i = prev; i < next; i++) {
 			unsigned long start = jiffies;
+			struct mce *entry = &mcelog.entry[i];
 
-			while (!mcelog.entry[i].finished) {
+			while (!entry->finished) {
 				if (time_after_eq(jiffies, start + 2)) {
-					memset(mcelog.entry + i, 0,
-					       sizeof(struct mce));
+					memset(entry, 0, sizeof(struct mce));
 					goto timeout;
 				}
 				cpu_relax();
 			}
 			smp_rmb();
-			err |= copy_to_user(buf, mcelog.entry + i,
-					    sizeof(struct mce));
+			err |= copy_to_user(buf, entry, sizeof(struct mce));
 			buf += sizeof(struct mce);
 timeout:
 			;
@@ -1565,13 +1564,13 @@ timeout:
 	on_each_cpu(collect_tscs, cpu_tsc, 1);
 
 	for (i = next; i < MCE_LOG_LEN; i++) {
-		if (mcelog.entry[i].finished &&
-		    mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) {
-			err |= copy_to_user(buf, mcelog.entry+i,
-					    sizeof(struct mce));
+		struct mce *entry = &mcelog.entry[i];
+
+		if (entry->finished && entry->tsc < cpu_tsc[entry->cpu]) {
+			err |= copy_to_user(buf, entry, sizeof(struct mce));
 			smp_rmb();
 			buf += sizeof(struct mce);
-			memset(&mcelog.entry[i], 0, sizeof(struct mce));
+			memset(entry, 0, sizeof(struct mce));
 		}
 	}
 
-- 
1.7.1


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