linux-ext4 - [PATCH] genhd: overlapping variable definition

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Message-ID: <20100106154555.3dd77fe2@nehalam>
Date:	Wed, 6 Jan 2010 15:45:55 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jens Axboe <jens.axboe@...cle.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	Theodore Ts'o <tytso@....edu>
Cc:	Greg KH <gregkh@...e.de>, Andreas Dilger <adilger@....com>,
	linux-ext4@...r.kernel.org
Subject: [PATCH] genhd: overlapping variable definition

This fixes the sparse warning:
fs/ext4/super.c:2390:40: warning: symbol 'i' shadows an earlier one
fs/ext4/super.c:2368:22: originally declared here

Using 'i' in a macro is dubious practice.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

--- a/include/linux/genhd.h	2010-01-06 10:49:11.822315232 -0800
+++ b/include/linux/genhd.h	2010-01-06 10:50:02.272939396 -0800
@@ -256,9 +256,9 @@ extern struct hd_struct *disk_map_sector
 #define part_stat_read(part, field)					\
 ({									\
 	typeof((part)->dkstats->field) res = 0;				\
-	int i;								\
-	for_each_possible_cpu(i)					\
-		res += per_cpu_ptr((part)->dkstats, i)->field;		\
+	unsigned int _cpu;						\
+	for_each_possible_cpu(_cpu)					\
+		res += per_cpu_ptr((part)->dkstats, _cpu)->field;	\
 	res;								\
 })
 
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