Andi Kleen <[email protected]> writes:
> [email protected] (Eric W. Biederman) writes:
>
>> Since sys_sysctl is deprecated start allow it to be compiled out.
>> This should catch any remaining user space code that cares,
>
> I tried this long ago, but found that glibc uses sysctl in each
> program to get the kernel version. It probably handles ENOSYS,
> but there might be slowdowns or subtle problems from it not knowing
> the kernel version.
>
> So I think it's ok to remove the big sysctl, but at a very minimal
> replacement that just handles (CTL_KERN, KERN_VERSION) is needed.
If glibc is looking at kernel.osrelease it might make sense.
If glibc is looking at kernel.version which is just the build number
and date I can't imagine a correct usage.
If this usage is still common in glibc we can decide what to do
when the warnings pop up.
> Also it's useful to printk for the rest at least for some time
> so we know what uses it.
Yes. Andrew and I discussed that and when he picked up a patch.
A printk was added to warn of people using the interface.
Eric
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