lkml.org 
[lkml]   [2007]   [May]   [30]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateTue, 29 May 2007 21:14:23 -0700 (PDT)
FromChristoph Lameter <>
SubjectRe: [PATCH 7/7] Add /proc/sys/vm/compact_node for the explicit compaction of a node
On Tue, 29 May 2007, Mel Gorman wrote:

> +	if (nodeid < 0)
> +		return -EINVAL;
> +
> +	pgdat = NODE_DATA(nodeid);
> +	if (!pgdat || pgdat->node_id != nodeid)
> +		return -EINVAL;

You cannot pass an arbitrary number to node data since NODE_DATA may do a 
simple array lookup.

Check for node < nr_node_ids first.

pgdat->node_id != nodeid? Sounds like something you should BUG() on.

IA64's NODE_DATA is

struct ia64_node_data {
        short                   active_cpu_count;
        short                   node;
        struct pglist_data      *pg_data_ptrs[MAX_NUMNODES];
};
/*
 * Given a node id, return a pointer to the pg_data_t for the node.
 *
 * NODE_DATA    - should be used in all code not related to system
 *                initialization. It uses pernode data structures to minimize
 *                offnode memory references. However, these structure are not
 *                present during boot. This macro can be used once cpu_init
 *                completes.
 */
#define NODE_DATA(nid)          (local_node_data->pg_data_ptrs[nid])
x86_64 also does

#define NODE_DATA(nid)          (node_data[nid])

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-05-30 04:17    [from the cache]
©2003-2008