linux-kernel - [PATCH] tty: only print sysrq help for handlers that are enabled

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Date:	Tue,  3 Dec 2013 07:55:25 -0800
From:	Shawn Landden <shawn@...rchofgit.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Cc:	linux-kernel@...r.kernel.org, Shawn Landden <shawn@...rchofgit.com>
Subject: [PATCH] tty: only print sysrq help for handlers that are enabled

Also print out a notice when sysrq is in selective mode.

Signed-off-by: Shawn Landden <shawn@...rchofgit.com>
---
 drivers/tty/sysrq.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index ce396ec..4eee0e4 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -548,9 +548,14 @@ void __handle_sysrq(int key, bool check_mask)
 					;
 				if (j != i)
 					continue;
-				printk("%s ", sysrq_key_table[i]->help_msg);
+				/* only print if handler is enabled */
+				if (sysrq_enabled & 1 ||
+				    sysrq_enabled & sysrq_key_table[i]->enable_mask)
+					printk("%s ", sysrq_key_table[i]->help_msg);
 			}
 		}
+		if (!(sysrq_enabled & 1))
+			printk("(some options are disabled)");
 		printk("\n");
 		console_loglevel = orig_log_level;
 	}
-- 
1.8.4.4

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