linux-kernel - Re: [PATCH 03/22] tools lib traceevent: Add traceevent_host

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Message-ID: <1385130172.1747.28.camel@leonhard>
Date:	Fri, 22 Nov 2013 23:22:52 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 03/22] tools lib traceevent: Add
 traceevent_host_bigendian function

2013-11-21 (목), 12:01 +0100, Jiri Olsa:
> Adding traceevent_host_bigendian function to get host
> endianity. It's used in following patches.

[SNIP]
> +static inline int traceevent_host_bigendian(void)
> +{
> +	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4 };
> +	unsigned int *ptr;
> +
> +	ptr = (unsigned int *)str;
> +	return *ptr == 0x01020304;

Is it safe for every architecture supported - especially ones that
require stricter alignment?  I know many architectures/compilers align
stack but not sure doing this is safe for all architecture.

Thanks,
Namhyung


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