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parisc: Use double word condition in 64bit CAS operation

Message ID BLU437-SMTP83DADEA6683F7E81EB14D997530@phx.gbl (mailing list archive)
State Accepted, archived
Delegated to: Helge Deller
Headers show

Commit Message

John David Anglin Sept. 8, 2015, 12:13 a.m. UTC 
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.

Cc: <stable@vger.kernel.org>
Signed-off-by: John David Anglin <dave.anglin>

--
John David Anglin	dave.anglin@bell.net
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Patch

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