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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221102101719.6cbcca6b@rorschach.local.home \
--to=rostedt@goodmis.org \
--cc=jgg@ziepe.ca \
--cc=leonid.ravich@toganetworks.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=linux-trace-kernel@vger.kernel.org \
--cc=lravich@gmail.com \
--cc=mingo@redhat.com \
--cc=yigal.korman@toganetworks.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.