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Subjectpass kernel pointers to the sysctl ->proc_handler method v3
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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

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