Patch "sysrq: attach sysrq handler correctly for 32-bit kernel" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

sysrq: attach sysrq handler correctly for 32-bit kernel

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sysrq-attach-sysrq-handler-correctly-for-32-bit-kernel.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Akinobu Mita <[email protected]>
Date: Fri, 6 Jan 2017 02:14:16 +0900
Subject: sysrq: attach sysrq handler correctly for 32-bit kernel

From: Akinobu Mita <[email protected]>

commit 802c03881f29844af0252b6e22be5d2f65f93fd0 upstream.

The sysrq input handler should be attached to the input device which has a left alt key.

On 32-bit kernels, some input devices which has a left alt key cannot attach sysrq handler. Because the keybit bitmap in struct input_device_id for sysrq is not correctly initialized. KEY_LEFTALT is 56 which is greater than BITS_PER_LONG on 32-bit kernels.

I found this problem when using a matrix keypad device which defines a KEY_LEFTALT (56) but doesn't have a KEY_O (24 == 56%32).

---
 drivers/tty/sysrq.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -939,8 +939,8 @@ static const struct input_device_id sysr
 	{
 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
 				INPUT_DEVICE_ID_MATCH_KEYBIT,
-		.evbit = { BIT_MASK(EV_KEY) },
-		.keybit = { BIT_MASK(KEY_LEFTALT) },
+		.evbit = { [BIT_WORD(EV_KEY)] = BIT_MASK(EV_KEY) },
+		.keybit = { [BIT_WORD(KEY_LEFTALT)] = BIT_MASK(KEY_LEFTALT) },
 	},
 	{ },
 };

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/sysrq-attach-sysrq-handler-correctly-for-32-bit-kernel.patch