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parisc: Use double word condition in 64bit CAS operation

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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>
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2015-09-07 20:13:28 -04:00 • committed by Helge Deller
parent b1b4e435e4
commit 1b59ddfcf1
1 changed files with 1 additions and 1 deletions
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arch/parisc/kernel/syscall.S
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@ -821,7 +821,7 @@ cas2_action:
/* 64bit CAS */ /* 64bit CAS */
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
19: ldd,ma 0(%sr3,%r26), %r29 19: ldd,ma 0(%sr3,%r26), %r29
sub,= %r29, %r25, %r0 sub,*= %r29, %r25, %r0
b,n cas2_end b,n cas2_end
20: std,ma %r24, 0(%sr3,%r26) 20: std,ma %r24, 0(%sr3,%r26)
copy %r0, %r28 copy %r0, %r28