On Sat, Aug 14, 2021 at 12:40:53AM +0800, yanghui wrote:
> +++ b/mm/mempolicy.c
> @@ -193,7 +193,7 @@ static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes)
> {
> if (nodes_empty(*nodes))
> return -EINVAL;
> - pol->nodes = *nodes;
> + WRITE_ONCE(pol->nodes, *nodes);
typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
If MAX_NUMNODES is large enough, is WRITE_ONCE going to work? It could
be 128 bits, and few architectures have an atomic 128-bit store
instruction.
