linux-kernel - Re: [Patch] signal: let valid

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Date:	Fri, 26 Dec 2008 17:16:04 +0000
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [Patch] signal: let valid_signal() check more

On Fri, Dec 26, 2008 at 09:56:54AM +0100, Ingo Molnar wrote:
>
>* Américo Wang <xiyou.wangcong@...il.com> wrote:
>
>> >> @@ -727,7 +727,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
>> >>  	{
>> >>  		if (!perm || !capable(CAP_KILL))
>> >>  			goto eperm;
>> >> -		if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
>> >> +		if (!valid_signal((int)arg) || arg == SIGKILL)
>> >                                  ^^^^^
>> >
>> >The patch adds a lot of unnecessary typecasts like this.
>> 
>> because it's inline?
>
>Why does your patch add a lot of seemingly unnecessary typecasts? [if your 
>short reply was supposed to be an answer to that question then please 
>explain it in more detail.]

Hi, Ingo.

because I also changed the type of valid_signal():

 -static inline int valid_signal(unsigned long sig)
 +static inline int valid_signal(int sig)

I noticed that gcc put this kind of warning into
-Wtraditional-conversion recently, but it is still useful to use
explicit cast, isn't it?

Thanks.

-- 
"Against stupidity, the gods themselves, contend in vain."

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