linux-kernel - Re: [PATCH v2] tools lib traceevent: str addresses in heterogeneous arch environments

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Date:	Fri, 18 Sep 2015 09:46:38 -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 v2] tools lib traceevent: str addresses in heterogeneous
 arch environments

On Fri, 18 Sep 2015 11:57:29 +0100
Kapileshwar Singh <kapileshwar.singh@....com> wrote:
\
> @@ -3754,7 +3754,24 @@ 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 the pointer must be 64-bit long
> +			 */
> +			addr = *(uint64_t *)(data + field->offset) &
> +				((1ULL << pevent->long_size * 8) - 1);

As I already replied. The above has two bugs in it.

-- Steve

> +
>  			/* Check if it matches a print format */
>  			printk = find_printk(pevent, addr);
>  			if (printk)

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