From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/3] printk: Fix preferred console selection with multiple matches
Date: Thu, 13 Feb 2020 09:39:42 +0100 [thread overview]
Message-ID: <20200213083942.6ue3ehaaycourgfi@pathway.suse.cz> (raw)
In-Reply-To: <20200213055236.GE13208@google.com>
On Thu 2020-02-13 14:52:36, Sergey Senozhatsky wrote:
> On (20/02/06 15:02), Benjamin Herrenschmidt wrote:
> [..]
> > static int __add_preferred_console(char *name, int idx, char *options,
> > - char *brl_options)
> > + char *brl_options, bool user_specified)
> > {
> > struct console_cmdline *c;
> > int i;
> > @@ -2131,6 +2131,8 @@ static int __add_preferred_console(char *name, int idx, char *options,
> > if (strcmp(c->name, name) == 0 && c->index == idx) {
> > if (!brl_options)
> > preferred_console = i;
> > + if (user_specified)
> > + c->user_specified = true;
> > return 0;
> > }
> > }
> > @@ -2140,6 +2142,7 @@ static int __add_preferred_console(char *name, int idx, char *options,
> > preferred_console = i;
> > strlcpy(c->name, name, sizeof(c->name));
> > c->options = options;
> > + c->user_specified = user_specified;
> > braille_set_options(c, brl_options);
> >
> > c->index = idx;
> > @@ -2194,7 +2197,7 @@ static int __init console_setup(char *str)
> > idx = simple_strtoul(s, NULL, 10);
> > *s = 0;
> >
> > - __add_preferred_console(buf, idx, options, brl_options);
> > + __add_preferred_console(buf, idx, options, brl_options, true);
> > console_set_on_cmdline = 1;
> > return 1;
> > }
> > @@ -2215,7 +2218,7 @@ __setup("console=", console_setup);
> > */
> > int add_preferred_console(char *name, int idx, char *options)
> > {
> > - return __add_preferred_console(name, idx, options, NULL);
> > + return __add_preferred_console(name, idx, options, NULL, false);
> > }
>
> A silly question:
>
> Can the same console first be added by
> console_setup()->__add_preferred_console(true)
> and then by
> add_preferred_console()->__add_preferred_console(false)
I guess that this might happen. It should be safe because
user_specified flag is set only to true when found again,
see:
if (user_specified)
c->user_specified = true;
Best Regards,
Petr
next prev parent reply other threads:[~2020-02-13 8:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 4:02 [PATCH v3 2/3] printk: Fix preferred console selection with multiple matches Benjamin Herrenschmidt
2020-02-11 14:41 ` Petr Mladek
2020-02-11 15:33 ` Benjamin Herrenschmidt
2020-02-13 5:52 ` Sergey Senozhatsky
2020-02-13 8:39 ` Petr Mladek [this message]
2020-02-13 9:09 ` Sergey Senozhatsky
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