Patch "parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels" has been added to the 4.13-stable tree

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

parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels

to the 4.13-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:
parisc-fix-double-word-compare-and-exchange-in-lws-code-on-32-bit-kernels.patch
and it can be found in the queue-4.13 subdirectory.

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

From: John David Anglin <[email protected]>
Date: Sat, 30 Sep 2017 17:24:23 -0400
Subject: parisc: Fix double-word compare and exchange in LWS code on 32-bit kernels

From: John David Anglin <[email protected]>

commit 374b3bf8e8b519f61eb9775888074c6e46b3bf0c upstream.

As discussed on the debian-hppa list, double-wordcompare and exchange operations fail on 32-bit kernels. Looking at the code, I realized that the ",ma" completer does the wrong thing in the "ldw,ma 4(%r26), %r29" instruction. This increments %r26 and causes the following store to write to the wrong location.

Note by Helge Deller:
The patch applies cleanly to stable kernel series if this upstream commit is merged in advance:
f4125cfdb300 ("parisc: Avoid trashing sr2 and sr3 in LWS code").

---
 arch/parisc/kernel/syscall.S |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -742,7 +742,7 @@ lws_compare_and_swap_2:
 10:	ldd	0(%r25), %r25
 11:	ldd	0(%r24), %r24
 #else
-	/* Load new value into r22/r23 - high/low */
+	/* Load old value into r22/r23 - high/low */
 10:	ldw	0(%r25), %r22
 11:	ldw	4(%r25), %r23
 	/* Load new value into fr4 for atomic store later */

@@ -834,11 +834,11 @@ cas2_action:
 	copy	%r0, %r28
 #else
 	/* Compare first word */
-19:	ldw,ma	0(%r26), %r29
+19:	ldw	0(%r26), %r29
 	sub,=	%r29, %r22, %r0
 	b,n	cas2_end
 	/* Compare second word */
-20:	ldw,ma	4(%r26), %r29
+20:	ldw	4(%r26), %r29
 	sub,=	%r29, %r23, %r0
 	b,n	cas2_end
 	/* Perform the store */

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

queue-4.13/parisc-fix-double-word-compare-and-exchange-in-lws-code-on-32-bit-kernels.patch