[PATCH 3.16.y-ckt 078/133] parisc: Use double word condition in 64bit CAS operation
Luis Henriques
luis.henriques at canonical.com
Wed Sep 30 09:50:26 UTC 2015
3.16.7-ckt18 -stable review patch. If anyone has any objections, please let me know.
------------------
From: John David Anglin <dave.anglin at 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 at gmx.de>
Signed-off-by: Luis Henriques <luis.henriques at canonical.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 7ef22e3387e0..0b8d26d3ba43 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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