From: Jani Nikula <jani.nikula@linux.intel.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
Byungchul Park <byungchul.park@lge.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Radoslaw Burny <rburny@google.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
intel-gfx@lists.freedesktop.org, paulmck@kernel.org
Subject: Re: [PATCH 05/12] drm/i915: Protect lockdep functions with #ifdef
Date: Wed, 09 Feb 2022 15:49:01 +0200 [thread overview]
Message-ID: <87iltonoaa.fsf@intel.com> (raw)
In-Reply-To: <CAM9d7ci0By5zioo+52+14RuFrTqZfzbupJuP-908HhYB2Ovc9A@mail.gmail.com>
On Tue, 08 Feb 2022, Namhyung Kim <namhyung@kernel.org> wrote:
> Hello,
>
> On Tue, Feb 8, 2022 at 10:51 AM Jani Nikula <jani.nikula@linux.intel.com> wrote:
>>
>> On Tue, 08 Feb 2022, Namhyung Kim <namhyung@kernel.org> wrote:
>> > With upcoming lock tracepoints config, it'd define some of lockdep
>> > functions without enabling CONFIG_LOCKDEP actually. The existing code
>> > assumes those functions will be removed by the preprocessor but it's
>> > not the case anymore. Let's protect the code with #ifdef's explicitly.
>>
>> I don't understand why you can't keep the no-op stubs for
>> CONFIG_LOCKDEP=n.
>
> Because I want to use the lockdep annotation for other purposes.
> But the workqueue lockdep_map was defined under LOCKDEP
> only. Please see the description in the cover letter.
>
> https://lore.kernel.org/all/20220208184208.79303-1-namhyung@kernel.org/
So lockdep_init_map() might still be there and build just fine for
CONFIG_LOCKDEP=n, but now we're actually required to wrap all call sites
in #ifdefs depending on the purpose? I'm not convinced yet.
BR,
Jani.
--
Jani Nikula, Intel Open Source Graphics Center
next prev parent reply other threads:[~2022-02-09 13:49 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-08 18:41 [RFC 00/12] locking: Separate lock tracepoints from lockdep/lock_stat (v1) Namhyung Kim
2022-02-08 18:41 ` [PATCH 01/12] locking: Pass correct outer wait type info Namhyung Kim
2022-02-08 18:41 ` [PATCH 02/12] cgroup: rstat: Make cgroup_rstat_cpu_lock name readable Namhyung Kim
2022-02-08 18:46 ` Tejun Heo
2022-02-08 19:16 ` Namhyung Kim
2022-02-08 23:51 ` Namhyung Kim
2022-02-08 18:41 ` [PATCH 03/12] timer: Protect lockdep functions with #ifdef Namhyung Kim
2022-02-08 19:36 ` Steven Rostedt
2022-02-08 20:29 ` Namhyung Kim
2022-02-08 21:19 ` Steven Rostedt
2022-02-08 18:42 ` [PATCH 04/12] workqueue: " Namhyung Kim
2022-02-08 18:48 ` Tejun Heo
2022-02-08 19:17 ` Namhyung Kim
2022-02-08 19:38 ` Steven Rostedt
2022-02-08 18:42 ` [PATCH 05/12] drm/i915: " Namhyung Kim
2022-02-08 18:51 ` Jani Nikula
2022-02-08 19:22 ` Namhyung Kim
2022-02-09 13:49 ` Jani Nikula [this message]
2022-02-09 16:27 ` Steven Rostedt
2022-02-09 19:28 ` Namhyung Kim
2022-02-08 18:42 ` [PATCH 06/12] btrfs: change lockdep class size check using ks->names Namhyung Kim
2022-02-08 19:03 ` David Sterba
2022-02-08 18:42 ` [PATCH 07/12] locking: Introduce CONFIG_LOCK_INFO Namhyung Kim
2022-02-08 18:42 ` [PATCH 08/12] locking/mutex: Init name properly w/ CONFIG_LOCK_INFO Namhyung Kim
2022-02-08 18:42 ` [PATCH 09/12] locking: Add more static lockdep init macros Namhyung Kim
2022-02-08 18:42 ` [PATCH 10/12] locking: Add CONFIG_LOCK_TRACEPOINTS option Namhyung Kim
2022-02-08 18:42 ` [PATCH 11/12] locking/mutex: Revive fast functions for CONFIG_LOCK_TRACEPOINTS Namhyung Kim
2022-02-09 8:40 ` Peter Zijlstra
2022-02-09 20:15 ` Namhyung Kim
2022-02-08 18:42 ` [PATCH 12/12] locking: Move lock_acquired() from the fast path Namhyung Kim
2022-02-08 19:14 ` [RFC 00/12] locking: Separate lock tracepoints from lockdep/lock_stat (v1) Namhyung Kim
2022-02-09 9:09 ` Peter Zijlstra
2022-02-09 18:19 ` Waiman Long
2022-02-09 18:29 ` Mathieu Desnoyers
2022-02-09 19:02 ` Waiman Long
2022-02-09 19:17 ` Mathieu Desnoyers
2022-02-09 19:37 ` Waiman Long
2022-02-09 19:22 ` Namhyung Kim
2022-02-09 19:28 ` Mathieu Desnoyers
2022-02-09 19:45 ` Namhyung Kim
2022-02-09 19:56 ` Mathieu Desnoyers
2022-02-09 20:17 ` Waiman Long
2022-02-10 0:27 ` Namhyung Kim
2022-02-10 2:12 ` Waiman Long
2022-02-10 9:33 ` Peter Zijlstra
2022-02-10 0:32 ` Namhyung Kim
2022-02-10 9:13 ` Peter Zijlstra
2022-02-10 19:14 ` Paul E. McKenney
2022-02-10 19:27 ` Waiman Long
2022-02-10 20:10 ` Paul E. McKenney
2022-02-11 5:57 ` Namhyung Kim
2022-02-11 5:55 ` Namhyung Kim
2022-02-11 10:39 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2022-02-08 19:43 [RFC RESEND 00/12] locking: Separate lock tracepoints from lockdep/lock_stat (v1.1) Namhyung Kim
2022-02-08 19:43 ` [PATCH 05/12] drm/i915: Protect lockdep functions with #ifdef Namhyung Kim
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