1 files changed, 9 insertions, 2 deletions

diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S
index 79dbfee831ec..49106c6e6f88 100644
--- a/arch/s390/kernel/vdso64/clock_gettime.S
+++ b/arch/s390/kernel/vdso64/clock_gettime.S
@@ -88,10 +88,17 @@ __kernel_clock_gettime:
         llilh   %r4,0x0100
         sar     %a4,%r4
         lghi    %r4,0
+        epsw    %r5,0
         sacf    512                             /* Magic ectg instruction */
         .insn   ssf,0xc80100000000,__VDSO_ECTG_BASE(4),__VDSO_ECTG_USER(4),4
-        sacf    0
-        sar     %a4,%r2
+        tml     %r5,0x4000
+        jo      11f
+        tml     %r5,0x8000
+        jno     10f
+        sacf    256
+        j       11f
+10:     sacf    0
+11:     sar     %a4,%r2
         algr    %r1,%r0                         /* r1 = cputime as TOD value */
         mghi    %r1,1000                        /* convert to nanoseconds */
         srlg    %r1,%r1,12                      /* r1 = cputime in nanosec */