sysctl: Initial support for auto-unregistering sysctl tables.
authorEric W. Biederman <ebiederm@xmission.com>
Tue, 10 Jan 2012 01:24:30 +0000 (17:24 -0800)
committerEric W. Biederman <ebiederm@xmission.com>
Wed, 25 Jan 2012 00:40:28 +0000 (16:40 -0800)
Add nreg to ctl_table_header.  When nreg drops to 0 the ctl_table_header
will be unregistered.

Factor out drop_sysctl_table from unregister_sysctl_table, and add
the logic for decrementing nreg.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

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