• Joel Schopp's avatar
    [PATCH] ppc64: cpu hotplug fix · b12db24d
    Joel Schopp authored
    On Power4 and earlier hardware there is no need to clear the CPPR (see RPAp
    479 section 18.5.4.7.2 for what little info there is on the CPPR) when
    stopping a cpu.  On hardware that uses Power5 an undocumented change has
    been made that requires the CPPR to be cleared if an isolate is to be done
    on the stopped cpu.  So the following patch lets cpu hotplug work on the
    recent hardware.
    
    I sent this patch to the ppc64-dev list back in mid April and Suse picked
    it up then for SLES9 so it has been well tested for several months.
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    b12db24d
xics.c 17.2 KB