[PATCH -mm 0/3] coredump: signal_pending() checks and cleanups

[Oleg Nesterov]

Hello.

To remind, this replaces the previous series,

	coredump-factor-out-the-setting-of-pf_dumpcore.patch
	freezer-do-not-send-a-fake-signal-to-a-pf_dumpcore-thread.patch
	coredump-make-wait_for_dump_helpers-freezable.patch

As Mandeep pointed out, 2/3 is not enough to make the coredump really
freezable.

By discussion with Mandeep, we simply accept the fact that the freezer
can truncate a core-dump, hopefully not a problem in practice.

2 and 3 become the "off-topic" cleanups but imho make sense anyway and
can help if we decide to make the coredumping freezable.

Mandeep, I didn't dare to keep your ack on 3/3, the patch was updated
a bit (s/freezable/interruptible + comments), I hope you can ack v2 too.
And of course I hope you will review 1 and 2 as well.

Oleg.

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