[3.16.y-ckt stable] Patch "tty: remove platform_sysrq_reset_seq" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    tty: remove platform_sysrq_reset_seq

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt15.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 3390af128bd72f24393a74470026cdf44ab52640 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd at arndb.de>
Date: Fri, 22 May 2015 21:59:36 +0200
Subject: tty: remove platform_sysrq_reset_seq

commit abab381feea7e61a0b5125504aa955cf339676ca upstream.

The platform_sysrq_reset_seq code was intended as a way for an embedded
platform to provide its own sysrq sequence at compile time. After over
two years, nobody has started using it in an upstream kernel, and
the platforms that were interested in it have moved on to devicetree,
which can be used to configure the sequence without requiring kernel
changes. The method is also incompatible with the way that most
architectures build support for multiple platforms into a single
kernel.

Now the code is producing warnings when built with gcc-5.1:

drivers/tty/sysrq.c: In function 'sysrq_init':
drivers/tty/sysrq.c:959:33: warning: array subscript is above array bounds [-Warray-bounds]
   key = platform_sysrq_reset_seq[i];

We could fix this, but it seems unlikely that it will ever be used,
so let's just remove the code instead. We still have the option to
pass the sequence either in DT, using the kernel command line,
or using the /sys/module/sysrq/parameters/reset_seq file.

Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Fixes: 154b7a489a ("Input: sysrq - allow specifying alternate reset sequence")
----
v2: moved sysrq_reset_downtime_ms variable to avoid introducing a compile
    warning when CONFIG_INPUT is disabled
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/tty/sysrq.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 454b65898e2c..b5e98de489dc 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -55,9 +55,6 @@
 static int __read_mostly sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
 static bool __read_mostly sysrq_always_enabled;

-unsigned short platform_sysrq_reset_seq[] __weak = { KEY_RESERVED };
-int sysrq_reset_downtime_ms __weak;
-
 static bool sysrq_on(void)
 {
 	return sysrq_enabled || sysrq_always_enabled;
@@ -567,6 +564,7 @@ void handle_sysrq(int key)
 EXPORT_SYMBOL(handle_sysrq);

 #ifdef CONFIG_INPUT
+static int sysrq_reset_downtime_ms;

 /* Simple translation table for the SysRq keys */
 static const unsigned char sysrq_xlate[KEY_CNT] =
@@ -947,23 +945,8 @@ static bool sysrq_handler_registered;

 static inline void sysrq_register_handler(void)
 {
-	unsigned short key;
 	int error;
-	int i;
-
-	/* First check if a __weak interface was instantiated. */
-	for (i = 0; i < ARRAY_SIZE(sysrq_reset_seq); i++) {
-		key = platform_sysrq_reset_seq[i];
-		if (key == KEY_RESERVED || key > KEY_MAX)
-			break;
-
-		sysrq_reset_seq[sysrq_reset_seq_len++] = key;
-	}

-	/*
-	 * DT configuration takes precedence over anything that would
-	 * have been defined via the __weak interface.
-	 */
 	sysrq_of_get_keyreset_config();

 	error = input_register_handler(&sysrq_handler);