Re: [LTP] [PATCH] ltp: handle missing online file

[Wanlong Gao <gaowanlong@cn.fujitsu.com>]

On 08/21/2013 04:34 AM, Dave Kleikamp wrote:
> gather_node_cpus() fails if the /sys/devices/system/node/nodeX/cpuX/online
> file is missing for any cpu other than cpu0. The absence of the online file
> should not be treated as a failure, but as an indication that the cpu is
> not hot-pluggable and cannot be taken offline.
> 
> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>


> 
> diff --git a/testcases/kernel/mem/lib/mem.c b/testcases/kernel/mem/lib/mem.c
> index 9bc926e..99243a6 100644
> --- a/testcases/kernel/mem/lib/mem.c
> +++ b/testcases/kernel/mem/lib/mem.c
> @@ -786,16 +786,14 @@ static void gather_node_cpus(char *cpus, long nd)
>  		if (path_exist(path, nd, i)) {
>  			snprintf(path1, BUFSIZ, "%s/online", path);
>  			/*
> -			 * No cpu0/online knob, as it can't support to
> -			 * on/offline cpu0, so if the 'nd' node contains
> -			 * cpu0, it should skip to check cpu0/online's value.
> +			 * if there is no online knob, then the cpu cannot
> +			 * be taken offline
>  			 */
> -			if (i == 0)
> -				goto next;
> -			SAFE_FILE_SCANF(cleanup, path1, "%ld", &online);
> -			if (online == 0)
> -				continue;
> -next:
> +			if (path_exist(path1)) {
> +				SAFE_FILE_SCANF(cleanup, path1, "%ld", &online);
> +				if (online == 0)
> +					continue;
> +			}
>  			sprintf(buf, "%d,", i);
>  			strcat(cpus, buf);
>  		}
> 
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