linux-kernel - [PATCH] mm/kfence: remove hung

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Message-ID: <1667986006-25420-1-git-send-email-quic_pkondeti@quicinc.com>
Date:   Wed, 9 Nov 2022 14:56:46 +0530
From:   Pavankumar Kondeti <quic_pkondeti@...cinc.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        Pavankumar Kondeti <quic_pkondeti@...cinc.com>
Subject: [PATCH] mm/kfence: remove hung_task cruft

commit fdf756f71271 ("sched: Fix more TASK_state comparisons") makes
hung_task not to monitor TASK_IDLE tasks. The special handling to
workaround hung_task warnings is not required anymore.

Signed-off-by: Pavankumar Kondeti <quic_pkondeti@...cinc.com>
---
 mm/kfence/core.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 1417888..08f5bd6 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -26,7 +26,6 @@
 #include <linux/random.h>
 #include <linux/rcupdate.h>
 #include <linux/sched/clock.h>
-#include <linux/sched/sysctl.h>
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -799,16 +798,7 @@ static void toggle_allocation_gate(struct work_struct *work)
 	/* Enable static key, and await allocation to happen. */
 	static_branch_enable(&kfence_allocation_key);
 
-	if (sysctl_hung_task_timeout_secs) {
-		/*
-		 * During low activity with no allocations we might wait a
-		 * while; let's avoid the hung task warning.
-		 */
-		wait_event_idle_timeout(allocation_wait, atomic_read(&kfence_allocation_gate),
-					sysctl_hung_task_timeout_secs * HZ / 2);
-	} else {
-		wait_event_idle(allocation_wait, atomic_read(&kfence_allocation_gate));
-	}
+	wait_event_idle(allocation_wait, atomic_read(&kfence_allocation_gate));
 
 	/* Disable static key and reset timer. */
 	static_branch_disable(&kfence_allocation_key);
-- 
2.7.4