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[PATCH 4.2 100/134] parisc: Use double word condition in 64bit CAS operation

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  [PATCH 4.2 100/134] parisc: Use double word condition in 64bit CAS operation Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-09-27 00:00 +0200

#1233512 — [PATCH 4.2 100/134] parisc: Use double word condition in 64bit CAS operation

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

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

From: John David Anglin <dave.anglin@bell.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@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/kernel/syscall.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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


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