linux-kernel - Re: [PATCH V3] perf tools: Change the default filenames for perf kvm diff to perf.data.xxx and perf.data.xxx.old

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Date:	Tue, 10 Dec 2013 20:38:54 -0700
From:	David Ahern <dsahern@...il.com>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>,
	acme@...stprotocols.net
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] perf tools: Change the default filenames for perf
 kvm diff to perf.data.xxx and perf.data.xxx.old

On 12/11/13, 9:30 AM, Dongsheng Yang wrote:
> @@ -1001,8 +1002,28 @@ static int data_init(int argc, const char **argv)
>   			use_default = false;
>   		}
>   	} else if (perf_guest) {
> -		defaults[0] = "perf.data.host";
> -		defaults[1] = "perf.data.guest";
> +		char *file_name;
> +		int len, ret;
> +
> +		file_name = (char *)get_filename_for_perf_kvm();
> +		if (!file_name) {
> +			pr_err("Failed to allocate memory for filename\n");
> +			return -ENOMEM;
> +		}
> +

The need for a typecast should tell you something is wrong. Why is 
get_filename_for_perf_kvm returning a const char * when it is allocated 
memory?

David
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