// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  Swap reorganised 29.12.95, Stephen Tweedie.
 *  kswapd added: 7.1.96  sct
 *  Removed kswapd_ctl limits, and swap out as many pages as needed
 *  to bring the system back to freepages.high: 2.4.97, Rik van Riel.
 *  Zone aware kswapd started 02/00, Kanoj Sarcar (kanoj@sgi.com).
 *  Multiqueue VM started 5.8.00, Rik van Riel.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

/* Extracted unchanged from Linux v6.12, mm/vmscan.c:7337-7353.
 * Complete named function; surrounding kernel context is required.
 * Source: https://github.com/torvalds/linux/blob/v6.12/mm/vmscan.c#L7337-L7353
 * License text: GPL-2.0.txt (in this directory).
 */
void __meminit kswapd_run(int nid)
{
	pg_data_t *pgdat = NODE_DATA(nid);

	pgdat_kswapd_lock(pgdat);
	if (!pgdat->kswapd) {
		pgdat->kswapd = kthread_run(kswapd, pgdat, "kswapd%d", nid);
		if (IS_ERR(pgdat->kswapd)) {
			/* failure at boot is fatal */
			pr_err("Failed to start kswapd on node %d，ret=%ld\n",
				   nid, PTR_ERR(pgdat->kswapd));
			BUG_ON(system_state < SYSTEM_RUNNING);
			pgdat->kswapd = NULL;
		}
	}
	pgdat_kswapd_unlock(pgdat);
}