• Lin Ming's avatar
    timekeeping: Fix clock_gettime vsyscall time warp · 0696b711
    Lin Ming authored
    Since commit 0a544198 "timekeeping: Move NTP adjusted clock multiplier
    to struct timekeeper" the clock multiplier of vsyscall is updated with
    the unmodified clock multiplier of the clock source and not with the
    NTP adjusted multiplier of the timekeeper.
    
    This causes user space observerable time warps:
    new CLOCK-warp maximum: 120 nsecs,  00000025c337c537 -> 00000025c337c4bf
    
    Add a new argument "mult" to update_vsyscall() and hand in the
    timekeeping internal NTP adjusted multiplier.
    Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
    Cc: "Zhang Yanmin" <yanmin_zhang@linux.intel.com>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Tony Luck <tony.luck@intel.com>
    LKML-Reference: <1258436990.17765.83.camel@minggr.sh.intel.com>
    Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
    0696b711
time.c 13.7 KB