• Mathias Krause's avatar
    padata: set cpu_index of unused CPUs to -1 · 1bd845bc
    Mathias Krause authored
    The parallel queue per-cpu data structure gets initialized only for CPUs
    in the 'pcpu' CPU mask set. This is not sufficient as the reorder timer
    may run on a different CPU and might wrongly decide it's the target CPU
    for the next reorder item as per-cpu memory gets memset(0) and we might
    be waiting for the first CPU in cpumask.pcpu, i.e. cpu_index 0.
    
    Make the '__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index'
    compare in padata_get_next() fail in this case by initializing the
    cpu_index member of all per-cpu parallel queues. Use -1 for unused ones.
    Signed-off-by: default avatarMathias Krause <minipli@googlemail.com>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    1bd845bc
padata.c 25.4 KB