linux-kernel - [PATCH 4.4 v1 14/17] mm/vmscan: Adjust system

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Message-Id: <1739170545-25011-15-git-send-email-kazuhiro3.hayashi@toshiba.co.jp>
Date: Mon, 10 Feb 2025 15:55:42 +0900
From: Kazuhiro Hayashi <kazuhiro3.hayashi@...hiba.co.jp>
To: linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
        cip-dev@...ts.cip-project.org
Cc: bigeasy@...utronix.de, tglx@...utronix.de, rostedt@...dmis.org,
        linux-rt-users@...r.kernel.org, pavel@...x.de
Subject: [PATCH 4.4 v1 14/17] mm/vmscan: Adjust system_state checks

From: Thomas Gleixner <tglx@...utronix.de>

commit c6202adf3a0969514299cf10ff07376a84ad09bb upstream.

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.

Tested-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20170516184736.119158930@linutronix.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Kazuhiro Hayashi <kazuhiro3.hayashi@...hiba.co.jp>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 76853088f66b..9cd702320375 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3620,7 +3620,7 @@ 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;
-- 
2.30.2