[PATCH 0/4] swapper fixes (Was: kernel panic on kill(0, SIGTERM)with PGID == 0)

[Oleg Nesterov]

Hello,

Mathias Krause reports that a buggy (or special) /sbin/init can
crash the kernel if it sends a signal to its pgrp/sid before it
changes its initial (0,0) pids. See the changelog for 1/4.

git-bisect blames "start the global /sbin/init with 0,0 special pids"
commit 430c623121ea88ca80595c99fdc63b7f8a803ae5, but in fact the
problem was caused by another change, see 2/4.

The patches do not depend on each other, 3/4 fixes another problem,
4/4 is purely cosmetic.

Oleg.

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