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Subject[tip: sched/core] cpu/hotplug: Allowing to reset fail injection
The following commit has been merged into the sched/core branch of tip:

Commit-ID: e58422d9789d5c61bb039e40e4e10781d8d43ac3
Gitweb: https://git.kernel.org/tip/e58422d9789d5c61bb039e40e4e10781d8d43ac3
Author: Vincent Donnefort <vincent.donnefort@arm.com>
AuthorDate: Tue, 16 Feb 2021 10:35:04
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 01 Mar 2021 18:17:26 +01:00

cpu/hotplug: Allowing to reset fail injection

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@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210216103506.416286-2-vincent.donnefort@arm.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;

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