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

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Date:	Mon, 21 Sep 2015 15:21:37 +0100
From:	Kapileshwar Singh <kapileshwar.singh@....com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"linux-kernel@...r.kernel.org" <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

Hi Steve!

Thanks again for reviewing.

On 21/09/15 14:56, Steven Rostedt wrote:
> 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.
> 

Makes sense. Will send an updated version.

Regards, 
KP

> -- 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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