* [PATCH] parisc: Use double word condition in 64bit CAS operation
@ 2015-09-08 0:13 John David Anglin
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From: John David Anglin @ 2015-09-08 0:13 UTC (permalink / raw)
To: linux-parisc List; +Cc: Helge Deller, James Bottomley
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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>
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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
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--
John David Anglin dave.anglin@bell.net
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2015-09-08 0:13 [PATCH] parisc: Use double word condition in 64bit CAS operation John David Anglin
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