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

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Date:	Wed, 04 May 2011 11:00:57 -0500
From:	Maynard Johnson <maynardj@...ibm.com>
To:	durga prasad <durgaprasad21@...il.com>
CC:	Robert Richter <robert.richter@....com>,
	Nicolas Kaiser <nikai@...ai.net>,
	"linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	"linux390@...ibm.com" <linux390@...ibm.com>
Subject: Re: [PATCH resend] s390: oprofile: fix error checks in oprofile_hwsampler_init()

On 05/04/2011 2:49 AM, durga prasad wrote:
>
> Thanks for the reply.
Durga, you're replying to the wrong thread.

-Maynard

> I can able to run oprofile on the target(ARM V7-CA9) in timer mode.
> The problem of Bad magic number is because of the JFFS2 file system.So I mounted
> usb on the target and colleted the sample on the target.
> I am able to analyze the sample on the target.But for analyzing the samples on
> the host I am doing the follows process.
>
> I mounted the USB to /var/lib/oprofile -- so the sample will be collected
> directly to USB
>
> After the I am running oparchieve on the target
>
> *oparchive -o /var/lib/oprofile/durga/*
>
> I am doing opimport on the host PC
>
> *# opimport -V -a /media/Pen_drive/durga/ -o /home/durga/oprofile/
>    error: must specify exactly 1 input file
>
> *I am getting the above error always.*
> *How to analyze the sample collected in the Host PC after collecting the samples
> in Pen drive from target*?
>
>
> *Your *help* will *be* warmly received.
>
> Regards,
> Durga Prasad
> *
>
>
> *
>
>
>
>
> On Tue, May 3, 2011 at 5:55 PM, Robert Richter <robert.richter@....com
> <mailto: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.
>
>     -Robert
>
>     >
>     >  Signed-off-by: Nicolas Kaiser <nikai@...ai.net <mailto:nikai@...ai.net>>
>     >  ---
>     >  Untested.
>     >
>     >   arch/s390/oprofile/init.c |   12 ++++++++----
>     >   1 files changed, 8 insertions(+), 4 deletions(-)
>     >
>     >  diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c
>     >  index c63d7e5..09c3088 100644
>     >  --- a/arch/s390/oprofile/init.c
>     >  +++ b/arch/s390/oprofile/init.c
>     >  @@ -138,22 +138,26 @@ static int oprofile_create_hwsampling_files(struct
>     super_block *sb,
>     >
>     >   static int oprofile_hwsampler_init(struct oprofile_operations *ops)
>     >   {
>     >  +     long retval;
>     >  +
>     >        if (hwsampler_setup())
>     >                return -ENODEV;
>     >
>     >        /*
>     >         * create hwsampler files only if hwsampler_setup() succeeds.
>     >         */
>     >  -     oprofile_min_interval = hwsampler_query_min_interval();
>     >  -     if (oprofile_min_interval < 0) {
>     >  +     retval = hwsampler_query_min_interval();
>     >  +     if (retval < 0) {
>     >                oprofile_min_interval = 0;
>     >                return -ENODEV;
>     >        }
>     >  -     oprofile_max_interval = hwsampler_query_max_interval();
>     >  -     if (oprofile_max_interval < 0) {
>     >  +     oprofile_min_interval = retval;
>     >  +     retval = hwsampler_query_max_interval();
>     >  +     if (retval < 0) {
>     >                oprofile_max_interval = 0;
>     >                return -ENODEV;
>     >        }
>     >  +     oprofile_max_interval = retval;
>     >
>     >        if (oprofile_timer_init(ops))
>     >                return -ENODEV;
>     >  --
>     >  1.7.3.4
>     >
>
>     --
>     Advanced Micro Devices, Inc.
>     Operating System Research Center
>
>
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>     _______________________________________________
>     oprofile-list mailing list
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>     https://lists.sourceforge.net/lists/listinfo/oprofile-list
>
>
>
>
> --
> regards
> prasad.....

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