linux-kernel - Re: [PATCH 1/7] tracing: typecast sizeof and offsetof to unsigned int

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Date:	Mon, 9 Mar 2009 22:20:33 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Theodore Tso <tytso@....edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Larry Woodman <lwoodman@...hat.com>,
	Jason Baron <jbaron@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/7] tracing: typecast sizeof and offsetof to unsigned
 int

On Tue, 10 Mar 2009 00:57:11 -0400 Steven Rostedt <rostedt@...dmis.org> wrote:

> On x86_64 sizeof and offsetof are treated as long, where as on x86_32
> they are int. This patch typecasts them to unsigned int to avoid
> one arch giving warnings while the other does not.

Actually, both have type size_t.

>  static int trace_write_header(struct trace_seq *s)
>  {
> @@ -457,11 +458,11 @@ static int trace_write_header(struct trace_seq *s)
>  
>  	/* struct trace_entry */
>  	return trace_seq_printf(s,
> -				"\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n"
> -				"\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n"
> -				"\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n"
> -				"\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n"
> -				"\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n"
> +				"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
> +				"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
> +				"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
> +				"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"
> +				"\tfield:%s %s;\toffset:%u;\tsize:%u;\n"

Which may be printed with %z.
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