• Arnd Bergmann's avatar
    powerpc/mpic: Don't reset affinity for secondary MPIC on boot · cc353c30
    Arnd Bergmann authored
    Kexec/kdump currently fails on the IBM QS2x blades when the kexec happens
    on a CPU other than the initial boot CPU.  It turns out that this is the
    result of mpic_init trying to set affinity of each interrupt vector to the
    current boot CPU.
    
    As far as I can tell,  the same problem is likely to exist on any
    secondary MPIC, because they have to deliver interrupts to the first
    output all the time. There are two potential solutions for this: either
    not set up affinity at all for secondary MPICs, or assume that a single
    CPU output is connected to the upstream interrupt controller and hardcode
    affinity to that per architecture.
    
    This patch implements the second approach, defaulting to the first output.
    Currently, all known secondary MPICs are routed to their upstream port
    using the first destination, so we hardcode that.
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    cc353c30
mpic.c 42 KB