linux-kernel - Re: [PATCH-next 3/3] serial/sysrq: Add MAGIC_SYSRQ_SERIAL

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Date:   Thu, 9 Jan 2020 15:53:14 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Vasiliy Khoruzhick <vasilykh@...sta.com>,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH-next 3/3] serial/sysrq: Add MAGIC_SYSRQ_SERIAL_SEQUENCE

Hi,

On 1/9/20 1:54 PM, Dmitry Safonov wrote:
> 
> Based-on-patch-by: Vasiliy Khoruzhick <vasilykh@...sta.com>
> Signed-off-by: Dmitry Safonov <dima@...sta.com>
> ---
>  drivers/tty/serial/serial_core.c | 52 ++++++++++++++++++++++++++++----
>  include/linux/serial_core.h      |  2 +-
>  lib/Kconfig.debug                |  8 +++++
>  3 files changed, 55 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 6ac9dfed3423..f70eba032d0b 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3081,6 +3081,38 @@ void uart_insert_char(struct uart_port *port, unsigned int status,
>  }
>  EXPORT_SYMBOL_GPL(uart_insert_char);
>  
> +const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
> +
> +static void uart_sysrq_on(struct work_struct *w)
> +{
> +	sysrq_toggle_support(1);
> +	pr_info("SysRq is enabled by magic sequience on serial\n");

typo:	                                   sequence

> +}
> +static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);



-- 
~Randy