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

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Date:   Wed, 9 Nov 2022 15:56:11 +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)) {

Same as with the 9th patch. I would merge this with the patch
switching to the srcu console list iterator. It will explain
why the racy check is needed here. This change does not make
sense without the other.

Best Regards,
Petr