Re: [PATCH printk 10/18] kgbd: Pretend that console list walk is safe
From: John Ogness
Date: Fri Sep 30 2022 - 09:45:08 EST
On 2022-09-30, Petr Mladek <pmladek@xxxxxxxx> wrote:
> Anyway, what about using the later added SRCU walk here?
> After all, this is exactly what RCU is for, isn't it?
So I think a lot of the problems with this series is that SRCU is
introduced too late. We are debating things in patch 6 that are
irrelevant by patch 12.
I will rework the series so that the changes come in the following
order:
1. provide an atomic console_is_enabled()
2. convert the list to SRCU
3. move all iterators from console_lock()/console_trylock() to SRCU
Step 3 may result in console_lock()/console_trylock() calls disappearing
or relocating to where they are needed for non-list-synchronization
purposes.
John