linux-kernel - [PATCH v2 1/3] cpu/hotplug: Allowing to reset fail injection

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Message-Id: <20210216103506.416286-2-vincent.donnefort@arm.com>
Date:   Tue, 16 Feb 2021 10:35:04 +0000
From:   vincent.donnefort@....com
To:     peterz@...radead.org, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, valentin.schneider@....com,
        Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH v2 1/3] cpu/hotplug: Allowing to reset fail injection

From: Vincent Donnefort <vincent.donnefort@....com>

Currently, the only way of resetting the fail injection is to trigger a
hotplug, hotunplug or both. This is rather annoying for testing
and, as the default value for this file is -1, it seems pretty natural to
let a user write it.

Signed-off-by: Vincent Donnefort <vincent.donnefort@....com>

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 4e11e91010e1..093f96fb0824 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2200,6 +2200,11 @@ static ssize_t write_cpuhp_fail(struct device *dev,
 	if (ret)
 		return ret;
 
+	if (fail == CPUHP_INVALID) {
+		st->fail = fail;
+		return count;
+	}
+
 	if (fail < CPUHP_OFFLINE || fail > CPUHP_ONLINE)
 		return -EINVAL;
 
-- 
2.25.1