Re: API changes / 2.6.21 sysctl changes

From: Bernd Schubert
Date: Mon Jun 11 2007 - 12:00:04 EST

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

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.

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