From: Dan Carpenter <dan.carpenter@oracle.com>
To: bigeasy@linutronix.de
Cc: linux-perf-users@vger.kernel.org
Subject: [bug report] irq_work: Allow irq_work_sync() to sleep if irq_work() no IRQ support.
Date: Wed, 19 Jan 2022 16:37:29 +0300 [thread overview]
Message-ID: <20220119133729.GA14183@kili> (raw)
Hello Sebastian Andrzej Siewior,
The patch 810979682ccc: "irq_work: Allow irq_work_sync() to sleep if
irq_work() no IRQ support." from Oct 6, 2021, leads to the following
Smatch static checker warning:
kernel/events/core.c:4955 _free_event()
warn: sleeping in atomic context
There are two potential call trees where preemption is disabled.
perf_remove_from_context() <- disables preempt
__perf_event_exit_context() <- disables preempt
-> __perf_remove_from_context()
-> perf_group_detach()
-> perf_put_aux_event()
-> put_event()
-> _free_event()
_free_event() calls irq_work_sync() which can now sleep.
regards,
dan carpenter
next reply other threads:[~2022-01-19 13:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-19 13:37 Dan Carpenter [this message]
2022-01-26 12:11 ` [bug report] irq_work: Allow irq_work_sync() to sleep if irq_work() no IRQ support Sebastian Andrzej Siewior
2022-01-26 13:24 ` Dan Carpenter
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