linux-kernel - Re: [PATCH printk v3 09/40] um: kmsg_dump: use console_is

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Date:   Wed, 9 Nov 2022 15:52:57 +0100
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, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org
Subject: Re: [PATCH printk v3 09/40] um: kmsg_dump: use console_is_enabled()

On Mon 2022-11-07 15:22:07, John Ogness wrote:
> Replace (console->flags & CON_ENABLED) usage with console_is_enabled().
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
> ---
>  arch/um/kernel/kmsg_dump.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/um/kernel/kmsg_dump.c b/arch/um/kernel/kmsg_dump.c
> index 40abf1e9ccb1..f0233e2f8de0 100644
> --- a/arch/um/kernel/kmsg_dump.c
> +++ b/arch/um/kernel/kmsg_dump.c
> @@ -32,7 +32,7 @@ static void kmsg_dumper_stdout(struct kmsg_dumper *dumper,
>  		 * expected to output the crash information.
>  		 */
>  		if (strcmp(con->name, "ttynull") != 0 &&
> -		    (con->flags & CON_ENABLED)) {
> +		    console_is_enabled(con)) {

The patch does not explain why the racy check is needed here.

I would prefer to merge this patch with the patch switching to the srcu
console list iterator. It will become more or less self-explaining.

Anyway, I agree that the racy check is acceptable here.

Best Regards,
Petr