linux-kernel - Re: API changes / 2.6.21 sysctl changes

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Message-Id: <200706111759.45774.bernd-schubert@gmx.de>
Date:	Mon, 11 Jun 2007 17:59:45 +0200
From:	Bernd Schubert <bernd-schubert@....de>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: API changes / 2.6.21 sysctl changes

On Monday 11 June 2007 17:46:27 Alexey Dobriyan wrote:
> On Mon, Jun 11, 2007 at 03:13:12PM +0200, Bernd Schubert wrote:
> > in 2.6.21 register_sysctl_table(), struct ctl_table and probably
> > something else did change. Unfortunately so far I didn't figure out the
> > "something else".
>
> Do you have a problem porting your sysctls to newer kernels?

A little bit, yes. Well, I got it working, but I don't understand why I had to 
do that whay.

I'm porting lustre to newer kernel versions and up to 2.6.20 the procfs/sysctl 
logic was 

1.) register_sysctl_table() -> creates /proc/sys/lnet

2.) create_proc_entry()  -> add additional files in /proc/sys/lnet 

With 2.6.21 creating additional entries in /proc/sys/lnet fails and I have to 
first call "proc_mkdir("sys/lnet", NULL)". I did this proc_mkdir() call even 
before the register_sysctl_table() call, hoping that its correct.

My guess is that register_sysctl_table() doesn't create /proc/sys/lnet 
anymore, but I have now idea why. Either I did something wrong or its 
intended. 

Since I don't like guessing I ask for more documentation. However I think in 
general, each interface change should be documented. Its just such a waste of 
time of many people, just because one person doesn't want to spend additional 
5 min to write what did change.

Thanks
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