Re: pass kernel pointers to the sysctl ->proc_handler method v3

[Al Viro]

On Fri, Apr 24, 2020 at 08:43:33AM +0200, Christoph Hellwig wrote:
> Hi all,
> 
> this series changes the sysctl ->proc_handler methods to take kernel
> pointers.  This simplifies some of the pointer handling in the methods
> (which could probably be further simplified now), and gets rid of the
> set_fs address space overrides used by bpf.
> 
> Changes since v2:
>  - free the buffer modified by BPF
>  - move pid_max and friends to pid.h
> 
> Changes since v1:
>  - drop a patch merged by Greg
>  - don't copy data out on a write
>  - fix buffer allocation in bpf

OK, I can live with that; further work can live on top of that, anyway.
How are we going to handle that?  I can put it into never-rebased branch
in vfs.git (#work.sysctl), so that people could pull that.

FWIW, I'm putting together more uaccess stuff (will probably hit -next
tonight or tomorrow); this would fit well there...