linux-kernel - Re: [PATCH 7/7] perf data: Fix signess of value

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Message-ID: <5535B8F3.8000306@huawei.com>
Date:	Tue, 21 Apr 2015 10:41:55 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>
CC:	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	He Kuang <hekuang@...wei.com>, Ingo Molnar <mingo@...nel.org>,
	"Jeremie Galarneau" <jgalar@...icios.com>,
	Namhyung Kim <namhyung@...nel.org>,
	"Paul Mackerras" <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tom Zanussi <tzanussi@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] perf data: Fix signess of value

On 2015/4/21 5:23, Arnaldo Carvalho de Melo wrote:
> Em Sat, Apr 18, 2015 at 05:50:20PM +0200, Jiri Olsa escreveu:
>> From: Wang Nan <wangnan0@...wei.com>
>>
>> When converting int values, perf first extractes it to a ulonglong, then
>> feeds it to babeltrace as a signed value. For negative 32 bit values
>> (for example, return values of failed syscalls), the extracted data
>> should be something like 0xfffffffe (-2). It becomes a large int64
>> value. Babeltrace denies to insert it with
>> bt_ctf_field_signed_integer_set_value() because it is larger than
>> 0x7fffffff, the largest positive value a signed 32 bit int can be.
> 
> There is no such word "signess", it is "signedness", fixing this up.
> Humm, it seems there is such a word indeed:
> 
> http://www.urbandictionary.com/define.php?term=Signess
> 
> But I bet this is the one we want:
> 
> http://en.wikipedia.org/wiki/Signedness
> 
> Right? :-)
> 
> - Arnaldo
>  

Sorry for the bad English. Please help me to fix it. Thank you.


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