[PATCH 0/4] signal: force_sig cleanups

[Oleg Nesterov]

The usage of force_sig/etc is almost always wrong outside
of do_trap-like paths, and this interface needs the fixes/
cleanups itself.

This series starts the necessary cleanups. Initially it had
one more patch, send_sig_all()->force_sig() is absolutely
wrong and should be replaced with SEND_SIG_FORCED too. But
this conflicts with other changes in tty.git, I need to
discuss this with Anton/Greg.

Oleg.

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