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

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Message-ID: <516E6E98.4010501@asianux.com>
Date:	Wed, 17 Apr 2013 17:42:48 +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: Re: [PATCH] kernel: debug: memcpy overlaped, use memmove instead
 of memcpy.

Hello maintainers:

  please help check this patch, when you have time, thanks.


On 2013年04月07日 18:24, Chen Gang wrote:
> 
>   in 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 better to use standard ways: 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));
>  		}
> 


-- 
Chen Gang

Asianux Corporation
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