linux-kernel - Re: [PATCH v3] tools lib traceevent: str addresses in heterogeneous arch environments

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Date:	Mon, 21 Sep 2015 09:56:24 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Kapileshwar Singh <kapileshwar.singh@....com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Javi Merino <javi.merino@....com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v3] tools lib traceevent: str addresses in heterogeneous
 arch environments

On Mon, 21 Sep 2015 14:24:13 +0100
Kapileshwar Singh <kapileshwar.singh@....com> wrote:

Thanks, this is better but one nit (below).

> @@ -3754,13 +3754,31 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
>  		 */
>  		if (!(field->flags & FIELD_IS_ARRAY) &&
>  		    field->size == pevent->long_size) {
> -			addr = *(unsigned long *)(data + field->offset);
> +
> +			/* Handle heterogeneous recording and processing
> +			 * architectures
> +			 *
> +			 * CASE I:
> +			 * Traces recorded on 32-bit devices (32-bit
> +			 * addressing) and processed on 64-bit devices:
> +			 * In this case, the higher 32-bits of the address
> +			 * need to be ignored.
> +			 *
> +			 * CASE II:
> +			 * Traces recorded on 64 bit devices and processed
> +			 * on 32-bit devices. In this case 64 bits must be
> +			 * read.
> +			 */
> +			addr = (pevent->long_size == 8) ?
> +			*(unsigned long long *)(data + field->offset) :
> +			(unsigned long long)*(unsigned int *)(data + field->offset);

Please indent the above lines such that it's not at the same level as
the start. It is a single C command, and needs to be reflected as such.
If it goes more than 80 characters, so be it. The above is worse than a
line a little longer than 80.

-- Steve

> +
>  			/* Check if it matches a print format */
>  			printk = find_printk(pevent, addr);
>  			if (printk)
>  				trace_seq_puts(s, printk->printk);
>  			else
> -				trace_seq_printf(s, "%lx", addr);
> +				trace_seq_printf(s, "%llx", addr);
>  			break;
>  		}
>  		str = malloc(len + 1);

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