linux-kernel - Re: [PATCH v5] earlycon: 8250: Fix command line regression

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Date:	Sun, 5 Apr 2015 13:02:12 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Peter Hurley <peter@...leysoftware.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH v5] earlycon: 8250: Fix command line regression

On Sun, Apr 5, 2015 at 7:52 AM, Peter Hurley <peter@...leysoftware.com> wrote:
> Restore undocumented behavior of kernel command line parameters of
> the forms:
>     console=uart[8250],io|mmio|mmio32,<addr>[,options]
>     console=uart[8250],<addr>[,options]
> where 'options' have not been specified; in this case, the hardware
> is assumed to be initialized.
>
> Document the required behavior of the original implementation.
>
> Fixes: c7cef0a84912cab3c9df8 ("console: Add extensible console matching")
> Reported-by: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Peter Hurley <peter@...leysoftware.com>
> ---
> v5: Refactored serial8250_console_setup() & univ8250_console_setup()
>     to eliminate open-coding; net +1 LOC (excludes documentation)
>
> v4: Removed FIXME comment
>
> v3: Fixed automatic console to port line settings initialization;
>     open-coded serial8250_console_setup() so the baud can be probed;
>     added sha reference in commit log
>
> v2: Fixed regression which allowed "console=uart1337,..." to start a
>     console (but not an earlycon)
>   + fixed earlycon= documentation related required behavior fixed by
>     this patch
>
>  Documentation/kernel-parameters.txt  | 18 ++++++++++++---
>  drivers/tty/serial/8250/8250_core.c  | 45 ++++++++++++++++++++++++++++--------
>  drivers/tty/serial/8250/8250_early.c | 19 ---------------
>  3 files changed, 50 insertions(+), 32 deletions(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index bfcb1a6..1facf0b 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -713,10 +713,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>
>                 uart[8250],io,<addr>[,options]
>                 uart[8250],mmio,<addr>[,options]
> +               uart[8250],mmio32,<addr>[,options]
> +               uart[8250],0x<addr>[,options]

You just don't listen.

I wasted too much time on this.

Greg,

Please just drop c7cef0a84912cab3c9df8 ("console: Add extensible
console matching").

Thanks

Yinghai
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