linux-kernel - Re: [PATCH] Revert "printk: wake up all waiters"

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Date:   Fri, 27 May 2022 14:52:06 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "printk: wake up all waiters"

On Thu 2022-05-26 22:36:56, John Ogness wrote:
> This reverts commit 938ba4084abcf6fdd21d9078513c52f8fb9b00d0.
> 
> The wait queue @log_wait never has exclusive waiters, so there
> is no need to use wake_up_interruptible_all(). Using
> wake_up_interruptible() was the correct function to wake all
> waiters.
> 
> Since there are no exclusive waiters, erroneously changing
> wake_up_interruptible() to wake_up_interruptible_all() did not
> result in any behavior change. However, using
> wake_up_interruptible_all() on a wait queue without exclusive
> waiters is fundamentally wrong.
> 
> Go back to using wake_up_interruptible() to wake all waiters.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

The patch has been committed into printk/linux.git, branch
rework/printk.

I am going to create the pull request the following week
after it gets at least one spin in linux-next.

It is trivial patch so that it might be sent directly.
But it does not affect the functionality and is is not
urgent either.

Best Regards,
Petr