From: Andrew Morton <akpm@linux-foundation.org>
To: Mandeep Singh Baines <msb@chromium.org>
Cc: linux-kernel@vger.kernel.org, Oleg Nesterov <oleg@redhat.com>,
Tejun Heo <tj@kernel.org>, "Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: [PATCH v4] lockdep: check that no locks held at freeze time
Date: Wed, 20 Feb 2013 15:24:46 -0800 [thread overview]
Message-ID: <20130220152446.a65ff84f.akpm@linux-foundation.org> (raw)
In-Reply-To: <1361402236-28644-1-git-send-email-msb@chromium.org>
On Wed, 20 Feb 2013 15:17:16 -0800
Mandeep Singh Baines <msb@chromium.org> wrote:
> We shouldn't try_to_freeze if locks are held.
>
> ...
>
> @@ -43,6 +44,9 @@ extern void thaw_kernel_threads(void);
>
> + if (!(current->flags & PF_NOFREEZE))
> + debug_check_no_locks_held(current,
> +
> "lock held while trying to freeze");
> ...
>
> + debug_check_no_locks_held(tsk, "lock held at task exit time");
There doesn't seem much point in adding the `msg' to
debug_check_no_locks_held() - the dump_stack() in
print_held_locks_bug() will tell us the same thing. Maybe just change
the print_held_locks_bug() messages so they stop assuming they were
called from do_exit()?
Also, I wonder if the `tsk' arg is needed. In both callers
tsk==current. Is it likely that we'll ever call
debug_check_no_locks_held() for any task other than `current'?
next prev parent reply other threads:[~2013-02-20 23:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-16 9:53 [PATCH 1/5] vfork: don't freezer_count() for in-kernel users of CLONE_VFORK Mandeep Singh Baines
2013-02-16 9:53 ` [PATCH 2/5] lockdep: check that no locks held at freeze time Mandeep Singh Baines
2013-02-16 17:06 ` Oleg Nesterov
2013-02-20 1:57 ` [PATCH v3] " Mandeep Singh Baines
2013-02-20 10:37 ` Ingo Molnar
2013-02-20 12:55 ` Rafael J. Wysocki
2013-02-20 13:52 ` Ingo Molnar
2013-02-20 22:30 ` Oleg Nesterov
2013-02-20 23:11 ` Mandeep Singh Baines
2013-02-20 23:17 ` [PATCH v4] " Mandeep Singh Baines
2013-02-20 23:24 ` Andrew Morton [this message]
2013-02-21 0:17 ` Mandeep Singh Baines
2013-02-21 0:20 ` Andrew Morton
2013-02-21 0:28 ` Mandeep Singh Baines
2013-02-21 0:42 ` Andrew Morton
2013-02-21 3:19 ` Mandeep Singh Baines
2013-02-21 3:17 ` [PATCH v5] " Mandeep Singh Baines
2013-02-21 15:42 ` Rafael J. Wysocki
2013-02-21 16:24 ` Mandeep Singh Baines
2013-02-21 16:51 ` [PATCH v6] " Mandeep Singh Baines
2013-02-21 21:42 ` Andrew Morton
2013-02-21 21:57 ` Mandeep Singh Baines
2013-02-16 9:53 ` [PATCH 3/5] coredump: use a freezable_schedule for the coredump_finish wait Mandeep Singh Baines
2013-02-16 17:17 ` Oleg Nesterov
2013-02-16 9:53 ` [PATCH 4/5] freezer: clear fake signal on exit from __refrigerator Mandeep Singh Baines
2013-02-16 17:06 ` Oleg Nesterov
2013-02-16 17:12 ` Oleg Nesterov
2013-02-20 18:09 ` Mandeep Singh Baines
2013-02-23 19:41 ` Oleg Nesterov
2013-02-23 19:59 ` Oleg Nesterov
2013-02-16 9:53 ` [PATCH 5/5] coredump: ignore non-fatal signals when core dumping to a pipe Mandeep Singh Baines
2013-02-16 17:10 ` Oleg Nesterov
2013-02-16 19:46 ` Oleg Nesterov
2013-02-18 23:55 ` Mandeep Singh Baines
2013-02-19 14:18 ` Oleg Nesterov
2013-02-19 5:19 ` Mandeep Singh Baines
2013-02-19 14:27 ` Oleg Nesterov
2013-02-19 19:33 ` Mandeep Singh Baines
2013-02-19 19:45 ` Oleg Nesterov
2013-02-19 20:20 ` Mandeep Singh Baines
2013-02-20 23:30 ` Mandeep Singh Baines
2013-02-23 19:21 ` Oleg Nesterov
2013-02-16 17:05 ` [PATCH 1/5] vfork: don't freezer_count() for in-kernel users of CLONE_VFORK Oleg Nesterov
2013-02-20 0:07 ` Mandeep Singh Baines
2013-02-20 1:41 ` Mandeep Singh Baines
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