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    SubjectRe: Fw: 2.6.16 crashes when running numastat on p575
    On Sun, 2 Apr 2006, Andrew Morton wrote:

    > I have a vague feeling that you guys worked on numastat?

    This is mostly Andi's code although I added the zone_pcp() stuff. This is
    failing because zone_pcp() only returns valid information for online

    Initially all zone_pcps() point to the boot_cpuset (see zone_pcp_init)
    and therefore zone_pcp) is always valid and we do not see this bug. But
    if someone downs a processor or a processor dies then free_zone_pageset()
    is called which will set zone_pcp() = NULL.

    Fix NULL pointer dereference in node_read_numastat()

    zone_pcp() only returns valid values if the processor is online.

    Change node_read_numastat() to only scan online processors.

    Signed-off-by: Christoph Lameter <>

    Index: linux-2.6.16/drivers/base/node.c
    --- linux-2.6.16.orig/drivers/base/node.c 2006-03-19 21:53:29.000000000 -0800
    +++ linux-2.6.16/drivers/base/node.c 2006-04-02 21:59:49.000000000 -0700
    @@ -106,7 +106,7 @@ static ssize_t node_read_numastat(struct
    other_node = 0;
    for (i = 0; i < MAX_NR_ZONES; i++) {
    struct zone *z = &pg->node_zones[i];
    - for (cpu = 0; cpu < NR_CPUS; cpu++) {
    + for_each_online_cpu(cpu) {
    struct per_cpu_pageset *ps = zone_pcp(z,cpu);
    numa_hit += ps->numa_hit;
    numa_miss += ps->numa_miss;
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      Last update: 2006-04-03 14:38    [W:0.020 / U:18.904 seconds]
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