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Date: Mon, 24 Feb 2025 09:51:51 -0500
From: Steven Rostedt <rostedt@goodmis.org>
To: Waiman Long <llong@redhat.com>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>, Peter Zijlstra
 <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Will Deacon
 <will@kernel.org>, Andrew Morton <akpm@linux-foundation.org>, Boqun Feng
 <boqun.feng@gmail.com>, Joel Granados <joel.granados@kernel.org>, Anna
 Schumaker <anna.schumaker@oracle.com>, Lance Yang <ioworker0@gmail.com>,
 Kent Overstreet <kent.overstreet@linux.dev>, Yongliang Gao
 <leonylgao@tencent.com>, Tomasz Figa <tfiga@chromium.org>, Sergey
 Senozhatsky <senozhatsky@chromium.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/2] hung_task: Show the blocker task if the task is
 hung on mutex
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On Sun, 23 Feb 2025 14:53:28 -0500
Waiman Long <llong@redhat.com> wrote:

> >> =C2=A0 +
> >> +#ifdef CONFIG_DETECT_HUNG_TASK_BLOCKER
> >> +static void debug_show_blocker(struct task_struct *task) =20
>=20
> I think the easiest way forward is to change it to "#if=20
> defined(CONFIG_DETECT_HUNG_TASK_BLOCKER) && !defined(CONFIG_PREEMPT_RT)"=
=20
> to skip this feature for PREEMPT_RT right now . Otherwise, you will have=
=20
> to deal with the rtmutex code.

If this isn't supported by PREEMPT_RT (yet), then just make the
DETECT_HUNG_TASK_BLOCKER in the Kconfig be:

	Depends on !PREEMPT_RT

Don't put that dependency in the code.

-- Steve