linux-kernel - [PATCH 09/13] sched_ext: Make handle_lockup() propagate scx

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Message-ID: <20251109183112.2412147-10-tj@kernel.org>
Date: Sun,  9 Nov 2025 08:31:08 -1000
From: Tejun Heo <tj@...nel.org>
To: David Vernet <void@...ifault.com>,
	Andrea Righi <andrea.righi@...ux.dev>,
	Changwoo Min <changwoo@...lia.com>
Cc: Dan Schatzberg <schatzberg.dan@...il.com>,
	Emil Tsalapatis <etsal@...a.com>,
	sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 09/13] sched_ext: Make handle_lockup() propagate scx_verror() result

handle_lockup() currently calls scx_verror() but ignores its return value,
always returning true when the scheduler is enabled. Make it capture and return
the result from scx_verror(). This prepares for hardlockup handling.

Cc: Dan Schatzberg <schatzberg.dan@...il.com>
Cc: Emil Tsalapatis <etsal@...a.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/sched/ext.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 5c75b0125dfe..4507bc4f0b5c 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -3658,6 +3658,7 @@ static __printf(1, 2) bool handle_lockup(const char *fmt, ...)
 {
 	struct scx_sched *sch;
 	va_list args;
+	bool ret;
 
 	guard(rcu)();
 
@@ -3669,9 +3670,9 @@ static __printf(1, 2) bool handle_lockup(const char *fmt, ...)
 	case SCX_ENABLING:
 	case SCX_ENABLED:
 		va_start(args, fmt);
-		scx_verror(sch, fmt, args);
+		ret = scx_verror(sch, fmt, args);
 		va_end(args);
-		return true;
+		return ret;
 	default:
 		return false;
 	}
-- 
2.51.1