linux-kernel - [PATCH 3.19.y-ckt 104/156] parisc: Use double word condition in 64bit CAS operation

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Message-Id: <1445377097-9921-105-git-send-email-kamal@canonical.com>
Date:	Tue, 20 Oct 2015 14:37:25 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Helge Deller <deller@....de>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 104/156] parisc: Use double word condition in 64bit CAS operation

3.19.8-ckt8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: John David Anglin <dave.anglin@...l.net>

commit 1b59ddfcf1678de38a1f8ca9fb8ea5eebeff1843 upstream.

The attached change fixes the condition used in the "sub" instruction.
A double word comparison is needed.  This fixes the 64-bit LWS CAS
operation on 64-bit kernels.

I can now enable 64-bit atomic support in GCC.

Signed-off-by: John David Anglin <dave.anglin>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/parisc/kernel/syscall.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/syscall.S b/arch/parisc/kernel/syscall.S
index 7ef22e3..0b8d26d 100644
--- a/arch/parisc/kernel/syscall.S
+++ b/arch/parisc/kernel/syscall.S
@@ -821,7 +821,7 @@ cas2_action:
 	/* 64bit CAS */
 #ifdef CONFIG_64BIT
 19:	ldd,ma	0(%sr3,%r26), %r29
-	sub,=	%r29, %r25, %r0
+	sub,*=	%r29, %r25, %r0
 	b,n	cas2_end
 20:	std,ma	%r24, 0(%sr3,%r26)
 	copy	%r0, %r28
-- 
1.9.1

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