• David Rientjes's avatar
    x86, numa: Add error handling for bad cpu-to-node mappings · 14392fd3
    David Rientjes authored
    CONFIG_DEBUG_PER_CPU_MAPS may return NUMA_NO_NODE when an
    early_cpu_to_node() mapping hasn't been initialized.  In such a
    case, it emits a warning and continues without an issue but
    callers may try to use the return value to index into an array.
    
    We can catch those errors and fail silently since a warning has
    already been emitted.  No current user of numa_add_cpu()
    requires this error checking to avoid a crash, but it's better
    to be proactive in case a future user happens to have a bug and
    a user tries to diagnose it with CONFIG_DEBUG_PER_CPU_MAPS.
    Reported-by: default avatarJesper Juhl <jj@chaosbits.net>
    Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
    Cc: Tejun Heo <tj@kernel.org>
    LKML-Reference: <alpine.DEB.2.00.1102071407250.7812@chino.kir.corp.google.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    14392fd3
numa_64.c 19.1 KB