linux-kernel - Re: Re: [PATCH 13/13] tracing/probes: Fix basic print type functions

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Date:	Mon, 05 Aug 2013 16:27:42 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Stev Rostedt <rostedt@...dmis.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Hyeoncheol Lee <cheol.lee@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: Re: [PATCH 13/13] tracing/probes: Fix basic print type functions

(2013/08/05 15:31), Joe Perches wrote:
> On Mon, 2013-08-05 at 15:22 +0900, Masami Hiramatsu wrote:
>> (2013/07/31 18:03), Namhyung Kim wrote:
>>> From: Namhyung Kim <namhyung.kim@....com>
>>>
>>> The print format of s32 type was "ld" and it's casted to "long".  So
>>> it turned out to print 4294967295 for "-1" on 64-bit systems.  Not
>>> sure whether it worked well on 32-bit systems.
> []
>>> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> []
>>> @@ -45,14 +45,19 @@ __kprobes int PRINT_TYPE_FUNC_NAME(type)(struct trace_seq *s,		\
> []
>>> +DEFINE_BASIC_PRINT_TYPE_FUNC(s8,  "%d", signed char)
> 
> If there's a need to identify signed char, why
> not signed short, signed int and signd long too?

Actually, since the types smaller than int are automatically up-casted
to (signed/unsigned) int, those do not require the cast.
However, u64/s64 requires those cast, because there are two different
definitions (see include/asm/int-l[l]64.h).

BTW, I think we should have a common definition of the printk format
for each integer types too.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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