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serial: core: Print escaped SysRq Magic sequence if enabled

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It is useful to see on the serial console the magic sequence itself
to enable SysRq without rummaging source code.

Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200310174337.74109-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2020-03-10 19:43:35 +02:00 committed by Greg Kroah-Hartman
parent 2ce5eace42
commit b18896ff3a
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/serial/serial_core.c
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@ -3092,8 +3092,11 @@ 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);