linux-kernel - Re: [Intel-gfx] [PATCH] kthread: finer-grained lockdep/cross-release completion

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Date:   Fri, 8 Dec 2017 19:40:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Marta Lofstedt <marta.lofstedt@...el.com>,
        Byungchul Park <byungchul.park@....com>,
        Ingo Molnar <mingo@...nel.org>, Tejun Heo <tj@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>, Shaohua Li <shli@...com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Oleg Nesterov <oleg@...hat.com>,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [Intel-gfx] [PATCH] kthread: finer-grained lockdep/cross-release
 completion

On Fri, Dec 08, 2017 at 05:36:28PM +0100, Daniel Vetter wrote:

> Aside: Could/should we take some fake lockdep locks around these
> callbacks, since not all drivers call them from a hardirq context? Just to
> validate that everyone follows the contract.

What I typically do is use local_irq_save/restore over the actual
callback. Then if someone doesn't honour the contract, it shows real
quick :-)