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Date:   Thu, 15 Aug 2019 17:27:21 -0300
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Daniel Vetter <daniel@ffwll.ch>
Cc:     Michal Hocko <mhocko@kernel.org>, Feng Tang <feng.tang@intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Kees Cook <keescook@chromium.org>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
        Jann Horn <jannh@google.com>,
        LKML <linux-kernel@vger.kernel.org>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        Linux MM <linux-mm@kvack.org>,
        =?utf-8?B?SsOpcsO0bWU=?= Glisse <jglisse@redhat.com>,
        Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        David Rientjes <rientjes@google.com>,
        Wei Wang <wvw@google.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Christian =?utf-8?B?S8O2bmln?= <christian.koenig@amd.com>
Subject: Re: [Intel-gfx] [PATCH 2/5] kernel.h: Add non_block_start/end()
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On Thu, Aug 15, 2019 at 10:16:43PM +0200, Daniel Vetter wrote:

> So if someone can explain to me how that works with lockdep I can of
> course implement it. But afaics that doesn't exist (I tried to explain
> that somewhere else already), and I'm no really looking forward to
> hacking also on lockdep for this little series.

Hmm, kind of looks like it is done by calling preempt_disable()

Probably the debug option is CONFIG_DEBUG_PREEMPT, not lockdep?

Jason