printk: add pr_flush()

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To: John Ogness <john.ogness@xxxxxxxxxxxxx>
Subject: printk: add pr_flush()
From: Mike Galbraith <efault@xxxxxx>
Date: Thu, 22 Oct 2020 16:12:41 +0200
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, linux-rt-users <linux-rt-users@xxxxxxxxxxxxxxx>
User-agent: Evolution 3.34.4

Greetings,

Seems this patch can cause hangs.  I can reliably reproduce one such
hang by poking sysrq-b, and it goes away if I revert that.

	-Mike

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