linux-kernel - Re: [PATCH 7/9] sys: Replace hardcoding of -20 and 19 with MIN_NICE and MAX

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Date:	Wed, 12 Feb 2014 11:59:28 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Kees Cook <keescook@...omium.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Robin Holt <holt@....com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 7/9] sys: Replace hardcoding of -20 and 19 with MIN_NICE
 and MAX_NICE.

Hi Kees,

  On 02/12/2014 02:27 AM, Kees Cook wrote:
> On Mon, Feb 10, 2014 at 11:34 PM, Dongsheng Yang
> <yangds.fnst@...fujitsu.com> wrote:
>> Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
>> cc: Andrew Morton <akpm@...ux-foundation.org>
>> cc: Oleg Nesterov <oleg@...hat.com>
>> cc: Robin Holt <holt@....com>
>> cc: Al Viro <viro@...iv.linux.org.uk>
>> cc: Kees Cook <keescook@...omium.org>
>> cc: "Eric W. Biederman" <ebiederm@...ssion.com>
>> cc: Stephen Rothwell <sfr@...b.auug.org.au>
>> cc: Peter Zijlstra <peterz@...radead.org>
>> cc: Ingo Molnar <mingo@...nel.org>
>> ---
>>   kernel/sys.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/kernel/sys.c b/kernel/sys.c
>> index c0a58be..adaeab6 100644
>> --- a/kernel/sys.c
>> +++ b/kernel/sys.c
>> @@ -174,10 +174,10 @@ SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
>>
>>          /* normalize: avoid signed division (rounding problems) */
>>          error = -ESRCH;
>> -       if (niceval < -20)
>> -               niceval = -20;
>> -       if (niceval > 19)
>> -               niceval = 19;
>> +       if (niceval < MIN_NICE)
>> +               niceval = MIN_NICE;
>> +       if (niceval > MAX_NICE)
>> +               niceval = MAX_NICE;
> Good catch! I'm all for using names instead of numeric values,
> however, I wonder if it'd be more readable to use "clamp" instead?
>
> niceval = clamp(niceval, MIN_NICE, MAX_NICE);

Good suggestion! This patch here is just to replace the numeric values with
a name defined in prio.h. So I will send another patch to make it more 
readable
with clamp after the patch set here applied. Is this plan ok to you?

Thanx.
>
> -Kees
>
>>          rcu_read_lock();
>>          read_lock(&tasklist_lock);
>> --
>> 1.8.2.1
>>
>
>

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