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Diffstat (limited to 'arch/s390/kernel/vdso64/gettimeofday.S')
-rw-r--r--arch/s390/kernel/vdso64/gettimeofday.S11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/s390/kernel/vdso64/gettimeofday.S b/arch/s390/kernel/vdso64/gettimeofday.S
index 6ce46707663c..b02e62f3bc12 100644
--- a/arch/s390/kernel/vdso64/gettimeofday.S
+++ b/arch/s390/kernel/vdso64/gettimeofday.S
@@ -31,7 +31,16 @@ __kernel_gettimeofday:
jnz 0b
stcke 0(%r15) /* Store TOD clock */
lg %r1,1(%r15)
- sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
+ lg %r0,__VDSO_TS_END(%r5) /* TOD steering end time */
+ slgr %r0,%r1 /* now - ts_steering_end */
+ ltgr %r0,%r0 /* past end of steering ? */
+ jm 6f
+ srlg %r0,%r0,15 /* 1 per 2^16 */
+ tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */
+ jz 7f
+ lcgr %r0,%r0 /* negative TOD offset */
+7: algr %r1,%r0 /* add steering offset */
+6: sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */
msgf %r1,__VDSO_TK_MULT(%r5) /* * tk->mult */
alg %r1,__VDSO_XTIME_NSEC(%r5) /* + tk->xtime_nsec */
lg %r0,__VDSO_XTIME_SEC(%r5) /* tk->xtime_sec */