• Jens Axboe's avatar
    Add generic helpers for arch IPI function calls · 3d442233
    Jens Axboe authored
    This adds kernel/smp.c which contains helpers for IPI function calls. In
    addition to supporting the existing smp_call_function() in a more efficient
    manner, it also adds a more scalable variant called smp_call_function_single()
    for calling a given function on a single CPU only.
    
    The core of this is based on the x86-64 patch from Nick Piggin, lots of
    changes since then. "Alan D. Brunelle" <Alan.Brunelle@hp.com> has
    contributed lots of fixes and suggestions as well. Also thanks to
    Paul E. McKenney <paulmck@linux.vnet.ibm.com> for reviewing RCU usage
    and getting rid of the data allocation fallback deadlock.
    Acked-by: default avatarIngo Molnar <mingo@elte.hu>
    Reviewed-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
    3d442233
smp.c 9.12 KB