linux-kernel - Re: [PATCH] perf: Fix endianness argument compatibility

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Message-Id: <20100413.014821.34906166.davem@davemloft.net>
Date:	Tue, 13 Apr 2010 01:48:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	imunsie@....ibm.com
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	paulus@...ba.org, mingo@...e.hu, acme@...hat.com,
	kosaki.motohiro@...fujitsu.com, mitake@....info.waseda.ac.jp,
	rusty@...tcorp.com.au, fweisbec@...il.com, ebmunson@...ibm.com,
	Valdis.Kletnieks@...edu, amwang@...hat.com, tfransosi@...il.com,
	mhiramat@...hat.com, xiaoguangrong@...fujitsu.com,
	jaswinderrajput@...il.com, arjan@...ux.intel.com,
	hirofumi@...l.parknet.co.jp, efault@....de, tzanussi@...il.com,
	anton@...ba.org, jkacur@...hat.com, lizf@...fujitsu.com,
	rostedt@...dmis.org
Subject: Re: [PATCH] perf: Fix endianness argument compatibility

From: "Ian Munsie" <imunsie@....ibm.com>
Date: Tue, 13 Apr 2010 18:37:33 +1000

> From: Ian Munsie <imunsie@...ibm.com>
> 
> Parsing an option from the command line with OPT_BOOLEAN on a bool data
> type would not work on a big-endian machine due to the manner in which
> the boolean was being cast into an int and incremented. For example,
> running 'perf probe --list' on a PowerPC machine would fail to properly
> set the list_events bool and would therefore print out the usage
> information and terminate.
> 
> This patch makes OPT_BOOLEAN work as expected with a bool datatype. For
> cases where the original OPT_BOOLEAN was intentionally being used to
> increment an int each time it was passed in on the command line, this
> patch introduces OPT_INCR with the old behaviour of OPT_BOOLEAN (the
> verbose variable is currently the only such example of this).
> 
> I have reviewed every use of OPT_BOOLEAN to verify that a true C99 bool
> was passed. Where integers were used, I verified that they were only
> being used for boolean logic and changed them to bools to ensure that
> they would not be mistakenly used as ints. The major exception was the
> verbose variable which now uses OPT_INCR instead of OPT_BOOLEAN.
> 
> Signed-off-by: Ian Munsie <imunsie@...ibm.com>

Thanks for finding and fixing this bug.
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