• Martin Schwidefsky's avatar
    [S390] rework idle code · 4c1051e3
    Martin Schwidefsky authored
    Whenever the cpu loads an enabled wait PSW it will appear as idle to the
    underlying host system. The code in default_idle calls vtime_stop_cpu
    which does the necessary voodoo to get the cpu time accounting right.
    The udelay code just loads an enabled wait PSW. To correct this rework
    the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts
    to entry[64].S, vtime_stop_cpu can now be called from anywhere and
    vtime_start_cpu is gone. The correction of the cpu time during wakeup
    from an enabled wait PSW is done with a critical section in entry[64].S.
    As vtime_start_cpu is gone, s390_idle_check can be removed as well.
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
nmi.c 9.73 KB