Qi Liu
5345ede4ac
drivers/perf: Prevent forced unbinding of PMU drivers ...
[ Upstream commit f32ed8eb0e3f0d0ef4ddb854554d60ca5863a9f9 ]
Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.
To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-07-29 10:18:40 +02:00
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drivers/perf: Prevent forced unbinding of PMU drivers
2020-07-29 10:18:40 +02:00
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5345ede4ac