linux-kernel - Re: [PATCH resend] s390: oprofile: fix error checks in oprofile_hwsampler

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Date:	Tue, 10 May 2011 11:00:54 +0200
From:	Robert Richter <robert.richter@....com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
CC:	Nicolas Kaiser <nikai@...ai.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"linux390@...ibm.com" <linux390@...ibm.com>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH resend] s390: oprofile: fix error checks in
 oprofile_hwsampler_init()

On 10.05.11 04:55:10, Martin Schwidefsky wrote:
> On Tue, 3 May 2011 10:55:40 +0200
> Robert Richter <robert.richter@....com> wrote:
> 
> > On 02.05.11 09:48:05, Nicolas Kaiser wrote:
> > > Checking 'oprofile_min_interval < 0' and
> > > 'oprofile_max_interval < 0' doesn't work because
> > > 'oprofile_min_interval' and 'oprofile_max_interval' are unsigned.
> > 
> > max/min_interval are through all the code always unsigned. I don't
> > know how min/max_sampl_rate in struct hws_qsi_info_block is spec'ed,
> > but there it is unsigned too.
> > 
> > So the best would be to return qsi.min/max_sampl_rate in
> > hwsampler_query_min/max_interval() directly with no error codes as
> > unsigned longs and to change the code in oprofile_hwsampler_init() to
> > check for null. Both functions hwsampler_query_min/max_interval()
> > could be moved to hwsampler.h as static inline functions. This makes
> > the code also easier.
> > 
> > This patch does not handle the null value case and the data truncation
> > by casting from unsigned to singed is not fixed.
> 
> Ok, the improved patch now looks like this:
> --
> Subject: [PATCH] s390: oprofile: fix min/max interval query checks
> 
> From: Martin Schwidefsky <schwidefsky@...ibm.com>
> 
> oprofile_min_interval and oprofile_max_interval are unsigned, checking
> for negative values doesn't work. Change hwsampler_query_min_interval
> and hwsampler_query_max_interval to return an unsigned long and
> check for a zero value instead.
> 
> Reported-by: Nicolas Kaiser <nikai@...ai.net>
> Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>

Looks good.

Acked-by: Robert Richter <robert.richter@....com>

Martin, can you queue this up?

Thanks,

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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