printk: add pr_flush()

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Provide a might-sleep function to allow waiting for console printers
to catch up to the latest logged message.

Use pr_flush() whenever it is desirable to get buffered messages
printed before continuing: suspend_console(), resume_console(),
console_stop(), console_start(), console_unblank().

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220421212250.565456-12-john.ogness@linutronix.de

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John Ogness 2022-04-21 23:28:46 +02:06 • committed by Petr Mladek

parent 03a749e628

commit 3b604ca812

2 changed files with 90 additions and 0 deletions

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7

include/linux/printk.h

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83

kernel/printk/printk.c

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