mm: vmscan: disable IRQ before __mod_lruvec_state()

__mod_lruvec_state() assumes that IRQ is disabled except when the stat
idx is NR_ANON_MAPPED, NR_FILE_MAPPED, and NR_ANON_THPS. Not disabling
IRQ before __mod_lruvec_state() in shrink_inactive_list() triggers
VM_WARN_ON_IRQS_ENABLED():

  WARNING: CPU: 9 PID: 180461 at mm/memcontrol.c:915 __mod_memcg_lruvec_state+0x20a/0x220
  [...]
  Call Trace:
     <TASK>
     shrink_inactive_list+0x1be/0x500
     shrink_lruvec+0x3a0/0x4f0
     ? lock_release+0x101/0x150
     ? srso_alias_return_thunk+0x5/0xfbef5
     ? lock_acquire+0x107/0x140
     ? srso_alias_return_thunk+0x5/0xfbef5
     ? lock_acquire+0x107/0x140
     shrink_node_memcgs+0x1db/0x270
     shrink_node+0x11d/0x440
     ? srso_alias_return_thunk+0x5/0xfbef5
     ? srso_alias_return_thunk+0x5/0xfbef5
     ? zone_reclaimable_pages+0x15c/0x200
     shrink_zones.constprop.0+0xb9/0x2b0
     do_try_to_free_pages+0x4a/0x2f0
     [...]
     </TASK>

Disable IRQ before calling __mod_lruvec_state().

This appears to be a mistake in commit d6530a1 ("mm: vmscan: rework
move_pages_to_lru()"). The latest version [1] of Muchun's lruvec
reparenting series handles this correctly.

Orabug: 37997618

Link: https://lore.kernel.org/linux-mm/[email protected] [1]
Fixes: d6530a1 ("mm: vmscan: rework move_pages_to_lru()")
Reviewed-by: Sidhartha Kumar <[email protected]>
Reviewed-by: Imran Khan <[email protected]>
Signed-off-by: Harry Yoo <[email protected]>

Author: Harry Yoo

mm/vmscan.c

@@ -1976,9 +1976,9 @@ static unsigned long shrink_inactive_list(unsigned long nr_to_scan,
 
 	move_folios_to_lru(&folio_list);
 
+	local_irq_disable();
 	__mod_lruvec_state(lruvec, PGDEMOTE_KSWAPD + reclaimer_offset(),
 					stat.nr_demoted);
-	local_irq_disable();
 	__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
 	item = PGSTEAL_KSWAPD + reclaimer_offset();
 	if (!cgroup_reclaim(sc))