printk: Prepare for SRCU console list protection

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Provide an NMI-safe SRCU protected variant to walk the console list.

Note that all console fields are now set before adding the console
to the list to avoid the console becoming visible by SCRU readers
before being fully initialized.

This is a preparatory change for a new console infrastructure which
operates independent of the console BKL.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-4-john.ogness@linutronix.de

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This commit is contained in:

John Ogness 2022-11-16 17:27:15 +01:06 • committed by Petr Mladek

parent d9a4af5690

commit 6c4afa7914

3 changed files with 100 additions and 16 deletions

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1

.clang-format

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28

include/linux/console.h

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97

kernel/printk/printk.c

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