[v2,2/4] serial: core: Print escaped SysRq Magic sequence if enabled

Message ID 20200310174337.74109-2-andriy.shevchenko@linux.intel.com
State New
Headers show
Series
  • Untitled series #39293
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Commit Message

Andy Shevchenko March 10, 2020, 5:43 p.m.
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>
---
v2: add tag
 drivers/tty/serial/serial_core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

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);