linux-kernel - Re: (subset) [PATCH REPOST^2] drm/ttm/tests: Let ttm_bo_test consider different ww

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Message-Id: <171887359115.3857922.3484081720728678081.b4-ty@kernel.org>
Date: Thu, 20 Jun 2024 10:53:11 +0200
From: Maxime Ripard <mripard@...nel.org>
To: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Amaranath Somalapuram <Amaranath.Somalapuram@....com>, 
 Andi Shyti <andi.shyti@...ux.intel.com>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Boqun Feng <boqun.feng@...il.com>, 
 Christian Koenig <christian.koenig@....com>, 
 Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...il.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Huang Rui <ray.huang@....com>, Ingo Molnar <mingo@...hat.com>, 
 Karolina Stolarek <karolina.stolarek@...el.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Thomas Zimmermann <tzimmermann@...e.de>, Waiman Long <longman@...hat.com>, 
 Will Deacon <will@...nel.org>
Subject: Re: (subset) [PATCH REPOST^2] drm/ttm/tests: Let ttm_bo_test
 consider different ww_mutex implementation.

On Wed, 19 Jun 2024 16:46:30 +0200, Sebastian Andrzej Siewior wrote:
> PREEMPT_RT has a different locking implementation for ww_mutex. The
> base mutex of struct ww_mutex is declared as struct WW_MUTEX_BASE. The
> latter is defined as `mutex' for non-PREEMPT_RT builds and `rt_mutex'
> for PREEMPT_RT builds.
> 
> Using mutex_lock() directly on the base mutex in
> ttm_bo_reserve_deadlock() leads to compile error on PREEMPT_RT.
> 
> [...]

Applied to misc/kernel.git (drm-misc-next).

Thanks!
Maxime