On 3/10/20 1:20 PM, Andy Shevchenko wrote:
> It is useful to see on the serial console the magic sequence itself
> to enable SysRq without rummaging source code.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Dmitry Safonov <0x7f454c46@xxxxxxxxx>
> ---
> drivers/tty/serial/serial_core.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index ec3b833e9f22..e3f2afc15ad4 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -3191,8 +3191,11 @@ static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE;
>
> static void uart_sysrq_on(struct work_struct *w)
> {
> + int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq);
> +
> sysrq_toggle_support(1);
> - pr_info("SysRq is enabled by magic sequence on serial\n");
> + pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n",
> + sysrq_toggle_seq_len, sysrq_toggle_seq);
> }
> static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on);
>
>
Thanks,
Dmitry
