linux-kernel - [PATCH 1/4] cpu/hotplug: Allowing to reset fail injection

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Date:   Mon, 11 Jan 2021 17:10:44 +0000
From:   vincent.donnefort@....com
To:     peterz@...radead.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org
Cc:     valentin.schneider@....com,
        Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH 1/4] cpu/hotplug: Allowing to reset fail injection

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

Currently, the only way of resetting this file is to actually try to run
a hotplug, hotunplug or both. This is quite annoying for testing and, as
the default value for this file is -1, it seems quite natural to let a
user write it.

Signed-off-by: Vincent Donnefort <vincent.donnefort@....com>
---
 kernel/cpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 1b6302e..9121edf 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2207,6 +2207,11 @@ 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;
 
-- 
2.7.4