On Sun, Apr 02, 2006 at 10:12:29PM -0700, Christoph Lameter wrote:
> 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
> processors.
>
> 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 <[email protected]>
>
> 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;
Works, thanks.
Sonny
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