• Christoph Lameter's avatar
    [IA64] ITC: Reduce rating for ITC clock if ITCs are drifty · b718f91c
    Christoph Lameter authored
    Make sure to reduce the rating of the ITC clock if ITCs are drifty. If they
    are drifting then we have not synchronized the ITC values, nor are we doing
    the jitter compensation (useless since drift may increase the differentials
    arbitrarily).
    
    Without this patch it is possible that the ITC clock becomes selected as
    the system clock on systems with drifty ITCs which will result in
    nanosleep hanging.
    
    One can still select the itc clock manually on such systems via
    
    clocksource=itc
    
    (Produces nice hangs on SGI Altix.)
    Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
    Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
    b718f91c
time.c 11.1 KB