linux-kernel - Re: [PATCH] printk: handle blank console arguments passed in.

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Message-ID: <20200520115023.GD520@jagdpanzerIV.localdomain>
Date:   Wed, 20 May 2020 20:50:23 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Shreyas Joshi <shreyas.joshi@...mp.com>,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printk: handle blank console arguments passed in.

On (20/05/15 17:24), Petr Mladek wrote:
[..]
> > diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> > index ad4606234545..e9ad730991e0 100644
> > --- a/kernel/printk/printk.c
> > +++ b/kernel/printk/printk.c
> > @@ -2165,7 +2165,10 @@ static int __init console_setup(char *str)
> >  	char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for "ttyS" */
> >  	char *s, *options, *brl_options = NULL;
> >  	int idx;
> > -
> > +	if (str[0] == 0) {
> > +		console_loglevel = 0;
> 
> What is the reason to set console_loglevel here, please?

Yeah, doesn't look necessary.

> > +		return 1;
> > +	}
> 
> Anyway, for example, earlycon parameter is allowed to be used with
> empty string when the console parameters can be set via ACPI SPCR,
> see param_setup_earlycon(). Therefore I am afraid that every setup()
> function has to handle this on its own and this patch makes sense.

Hmm, OK.

FWIW,
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

	-ss