| From | Kamal Mostafa <> | Subject | [PATCH 3.19.y-ckt 104/156] parisc: Use double word condition in 64bit CAS operation | Date | Tue, 20 Oct 2015 14:37:25 -0700 |
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3.19.8-ckt8 -stable review patch. If anyone has any objections, please let me know.
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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: Kamal Mostafa <kamal@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 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 -- 1.9.1
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