From: Steven Rostedt <rostedt@goodmis.org>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leonid Ravich <leonid.ravich@toganetworks.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Yigal Korman <yigal.korman@toganetworks.com>,
"linux-trace-kernel@vger.kernel.org"
<linux-trace-kernel@vger.kernel.org>,
Leon Ravich <lravich@gmail.com>
Subject: Re: BUG: ib_mad ftrace event unsupported migration
Date: Wed, 2 Nov 2022 10:17:19 -0400 [thread overview]
Message-ID: <20221102101719.6cbcca6b@rorschach.local.home> (raw)
In-Reply-To: <Y2J4/NQMhRORqnZ0@ziepe.ca>
On Wed, 2 Nov 2022 11:04:44 -0300
Jason Gunthorpe <jgg@ziepe.ca> wrote:
> So this tracepoint is just wrong, you can't call a sleepable function
> from a tracepoint like that?
>
> Presumably lockdep would/should warn about this?
Why didn't it trigger a "scheduling while atomic" bug? That should
happen if you call a sleeping function while preemption is disabled. Or
does this function explicitly enable preemption? Which nothing checks
if you enable preemption while recording to the ring buffer. I guess we
could add that check, but this is not something that commonly happens
enough to bother.
-- Steve
next prev parent reply other threads:[~2022-11-02 14:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-02 10:49 BUG: ib_mad ftrace event unsupported migration Leonid Ravich
2022-11-02 11:44 ` Steven Rostedt
2022-11-02 13:02 ` Jason Gunthorpe
2022-11-02 14:02 ` Leonid Ravich
2022-11-02 14:04 ` Jason Gunthorpe
2022-11-02 14:17 ` Steven Rostedt [this message]
2022-11-02 14:24 ` Jason Gunthorpe
2022-11-02 15:59 ` Steven Rostedt
2022-11-02 16:01 ` Jason Gunthorpe
2022-11-02 20:01 ` Leonid Ravich
2022-11-02 22:19 ` Steven Rostedt
2022-11-03 12:22 ` Leonid Ravich
2022-11-03 16:32 ` Steven Rostedt
2022-11-02 14:20 ` Steven Rostedt
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