linux-kernel - Re: [PATCH -tip v6 04/11] kprobes: Jump optimization sysctl interface

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Date:	Sat, 28 Nov 2009 11:11:32 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Anders Kaseorg <andersk@...lice.com>,
	Tim Abbott <tabbott@...lice.com>,
	Andi Kleen <andi@...stfloor.org>,
	Jason Baron <jbaron@...hat.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH -tip v6 04/11] kprobes: Jump optimization sysctl interface

Eric W. Biederman wrote:
> Masami Hiramatsu<mhiramat@...hat.com>  writes:
>
>> Add /proc/sys/debug/kprobes-optimization sysctl which enables and disables
>> kprobes jump optimization on the fly for debugging.
>>
>> Changes in v6:
>> - Update comments and coding style.
>>
>
> This will break when it hits the linux-next.  As ctl_name has been
> removed in the sysctl tree.  Not setting ctl_name is equivalent
> to setting ctl_name = CTL_UNNUMBERED.  It is 0 in both cases.
> So you can safely drop touches of ctl_name.
>
> Ideally you would also call register_sysctl_paths from kernel/kprobes.c
> and not add to the ifdef horror that is kernel/sysctl.c but that
> is probably more trouble than it is worth right now.    One way or
> another there is going to be at least a minor conflict when this code
> merges with the sysctl tree.

Thanks for telling me!
OK, so I'll remove that line.

Thank you,

>>   #include<asm/uaccess.h>
>>   #include<asm/processor.h>
>> @@ -1621,6 +1622,18 @@ static struct ctl_table debug_table[] = {
>>   		.proc_handler	= proc_dointvec
>>   	},
>>   #endif
>> +#if defined(CONFIG_OPTPROBES)
>> +	{
>> +		.ctl_name	= CTL_UNNUMBERED,
>                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Please remove this line.
>> +		.procname	= "kprobes-optimization",
>> +		.data		=&sysctl_kprobes_optimization,
>> +		.maxlen		= sizeof(int),
>> +		.mode		= 0644,
>> +		.proc_handler	= proc_kprobes_optimization_handler,
>> +		.extra1		=&zero,
>> +		.extra2		=&one,
>> +	},
>> +#endif
>>   	{ .ctl_name = 0 }
>>   };
>
>
> Eric
> --
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-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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