Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 27/84] parisc: Use double word condition in 64bit CAS operation | Date | Tue, 29 Sep 2015 17:18:19 +0200 |
| |
3.14-stable review patch. If anyone has any objections, please let me know.
------------------
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/parisc/kernel/syscall.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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
| |