netdev - Re: Fwd: Re: [PATCH] net: ipv6: change %8s to %s for rt->dst.dev->name in seq_printf of rt6_info

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Message-ID: <50B44563.8060905@asianux.com>
Date:	Tue, 27 Nov 2012 12:45:23 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Shan Wei <shanwei88@...il.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Fwd: Re: [PATCH] net: ipv6: change %8s to %s for rt->dst.dev->name
 in seq_printf of rt6_info_route

于 2012年11月27日 12:18, Chen Gang 写道:
> 于 2012年11月27日 11:17, Shan Wei 写道:
>> > Chen Gang said, at 2012/11/23 11:35:
>>> >> 2) about %*s:
>>> >>  since kernel is an open system, IFNAMSIZ is belong to OS API level for outside
>>> >>    it has effect both on individual kernel modules and user mode system call
>>> >>    we need obey this rule, and %8s is not match this rule.
>>> >>    so %8s is not suitable. (and now we have to choose %16s or %s).
>> > 
>> > Your patch will change the format of /proc/net/ipv6_route.
>   Yes, it will be changed.
>   although it belongs to "User Experience", it is not belong to os api level.
>     for os api level: we must commit them not be changed (they are testament)
>     for User Experience: we can change it, but maybe users feel 'not good'.
> 
  I think (only for my thought, maybe not correct):
    for user input through /proc/* are all for os api level, not for "User Experience".
    for most of outputs to user through /proc/*, are "User Experience".

>> > Why we need to keep be consistent with user mode?
>   it is for "keep source code simple and clear"
>   when others see the %8s, easy to make them miss understanding (not quite clear)
>   so better to change it to %s.
> 
> 
>> > However user operates device name, no effect on the showing of /proc/net/ipv6_route.
>   now, no effect.
> 
> 
> all together:
>   since we are not user interactive program,
>     "keeping source code simple and clear" is more important than "User Experience"
> 
> 
>> > 
>>> >>
>>> >>  for the format of information which seq_printf output:
>>> >>    it is not belong to OS API level for outside (at least, for current case, it is true). 
>>> >>    so we need not keep 'compatible' of it, so %16s is not necessary.
>> > 
>> > Can you explain If we don't change to %s, what will happen?
>> > 
>   for outside, nothing will happen.
> 
>   so it is not for correctness, it is only for "keep source code simple and clear".
> 
>>> >>
>>> >>  for keeping source code simple and clearly:
>>> >>    %s is better than %16s.
>>> >>
>>> >>  so for result, we should choose %s only (neither %16s nor %8s).
>> > 
>> > --
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>> > 
>> > 
> 
> -- Chen Gang Asianux Corporation -- To unsubscribe from this list: send
> the line "unsubscribe netdev" in the body of a message to
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> 


-- 
Chen Gang

Asianux Corporation
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