printk: console_device: use srcu console list iterator

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Use srcu console list iteration for console list traversal. It is
acceptable because the consoles might come and go at any time.
Strict synchronizing with console registration code would not bring
any advantage over srcu.

Document why the console_lock is still necessary. Note that this
is a preparatory change for when console_lock no longer provides
synchronization for the console list.

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/20221116162152.193147-21-john.ogness@linutronix.de

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John Ogness 2022-11-16 17:27:32 +01:06 • committed by Petr Mladek

parent 87f2e4b7d9

commit 8cb15f7f49

1 changed files with 11 additions and 1 deletions

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kernel/printk/printk.c

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