On 05/16/2017 08:42 PM, Thomas Gleixner wrote:
> To enable smp_processor_id() and might_sleep() debug checks earlier, it's
> required to add system states between SYSTEM_BOOTING and SYSTEM_RUNNING.
>
> Adjust the system_state check in kswapd_run() to handle the extra states.
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Reviewed-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Vlastimil Babka <vbabka@xxxxxxx>
> Cc: linux-mm@xxxxxxxxx
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
> ---
> mm/vmscan.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -3643,7 +3643,7 @@ int kswapd_run(int nid)
> pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
> if (IS_ERR(pgdat->kswapd)) {
> /* failure at boot is fatal */
> - BUG_ON(system_state == SYSTEM_BOOTING);
> + BUG_ON(system_state < SYSTEM_RUNNING);
> pr_err("Failed to start kswapd on node %d\n", nid);
> ret = PTR_ERR(pgdat->kswapd);
> pgdat->kswapd = NULL;
>
>
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