linux-kernel - [PATCH v2] kernel: debug: memcpy overlaped, use memmove instead of memcpy.

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Message-ID: <5194C3EF.8030508@asianux.com>
Date:	Thu, 16 May 2013 19:33:03 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	jason.wessel@...driver.com
CC:	kgdb-bugreport@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] kernel: debug: memcpy overlaped, use memmove instead of
 memcpy.


For memcpy(), src and dest are overlaped: for default implementaion or
some architectures, it is OK,  but we can not be sure that it is OK for
all platforms, and in this condition, the performance are not quite
important.

So let memmove instead of memcpy.


Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/debug/kdb/kdb_support.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index d35cc2d..990b3cc 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
 		}
 		if (i >= ARRAY_SIZE(kdb_name_table)) {
 			debug_kfree(kdb_name_table[0]);
-			memcpy(kdb_name_table, kdb_name_table+1,
+			memmove(kdb_name_table, kdb_name_table+1,
 			       sizeof(kdb_name_table[0]) *
 			       (ARRAY_SIZE(kdb_name_table)-1));
 		} else {
 			debug_kfree(knt1);
 			knt1 = kdb_name_table[i];
-			memcpy(kdb_name_table+i, kdb_name_table+i+1,
+			memmove(kdb_name_table+i, kdb_name_table+i+1,
 			       sizeof(kdb_name_table[0]) *
 			       (ARRAY_SIZE(kdb_name_table)-i-1));
 		}
-- 
1.7.7.6
--
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