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From:   Daniel Vetter <daniel@ffwll.ch>
Date:   Thu, 15 Aug 2019 22:49:31 +0200
Message-ID: <CAKMK7uER0u1TqeJBXarKakphnyZTHOmedOfXXqLGVDE2mE-mAQ@mail.gmail.com>
Subject: Re: [Intel-gfx] [PATCH 2/5] kernel.h: Add non_block_start/end()
To:     Jason Gunthorpe <jgg@ziepe.ca>
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?SsOpcsO0bWUgR2xpc3Nl?= <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>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>
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On Thu, Aug 15, 2019 at 10:27 PM Jason Gunthorpe <jgg@ziepe.ca> wrote:
> 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()

Yup. That was v1, then came the suggestion that disabling preemption
is maybe not the best thing (the oom reaper could still run for a long
time comparatively, if it's cleaning out gigabytes of process memory
or what not, hence this dedicated debug infrastructure).

> Probably the debug option is CONFIG_DEBUG_PREEMPT, not lockdep?

CONFIG_DEBUG_ATOMIC_SLEEP. Like in my patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch