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Thu, 15 Aug 2019 00:14:18 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:569e:0:3106:d637:d723:e855]) by smtp.gmail.com with ESMTPSA id br8sm265471ejb.92.2019.08.15.00.14.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Aug 2019 00:14:17 -0700 (PDT) Date: Thu, 15 Aug 2019 09:14:15 +0200 From: Daniel Vetter To: Jason Gunthorpe Cc: Daniel Vetter , LKML , linux-mm@kvack.org, DRI Development , Intel Graphics Development , Ralph Campbell , John Hubbard , Dan Williams , Dan Carpenter , Matthew Wilcox , Arnd Bergmann , Balbir Singh , Ira Weiny , Souptick Joarder , Andrew Morton , =?iso-8859-1?B?Suly9G1l?= Glisse , Daniel Vetter Subject: Re: [PATCH 5/5] mm/hmm: WARN on illegal ->sync_cpu_device_pagetables errors Message-ID: <20190815071415.GD7444@phenom.ffwll.local> Mail-Followup-To: Jason Gunthorpe , LKML , linux-mm@kvack.org, DRI Development , Intel Graphics Development , Ralph Campbell , John Hubbard , Dan Williams , Dan Carpenter , Matthew Wilcox , Arnd Bergmann , Balbir Singh , Ira Weiny , Souptick Joarder , Andrew Morton , =?iso-8859-1?B?Suly9G1l?= Glisse , Daniel Vetter References: <20190814202027.18735-1-daniel.vetter@ffwll.ch> <20190814202027.18735-6-daniel.vetter@ffwll.ch> <20190815001137.GE11200@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20190815001137.GE11200@ziepe.ca> X-Operating-System: Linux phenom 4.19.0-5-amd64 User-Agent: Mutt/1.10.1 (2018-07-13) Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Aug 14, 2019 at 09:11:37PM -0300, Jason Gunthorpe wrote: > On Wed, Aug 14, 2019 at 10:20:27PM +0200, Daniel Vetter wrote: > > Similar to the warning in the mmu notifer, warning if an hmm mirror > > callback gets it's blocking vs. nonblocking handling wrong, or if it > > fails with anything else than -EAGAIN. > >=20 > > Cc: Jason Gunthorpe > > Cc: Ralph Campbell > > Cc: John Hubbard > > Cc: Dan Williams > > Cc: Dan Carpenter > > Cc: Matthew Wilcox > > Cc: Arnd Bergmann > > Cc: Balbir Singh > > Cc: Ira Weiny > > Cc: Souptick Joarder > > Cc: Andrew Morton > > Cc: "J=E9r=F4me Glisse" > > Cc: linux-mm@kvack.org > > Signed-off-by: Daniel Vetter > > mm/hmm.c | 3 +++ > > 1 file changed, 3 insertions(+) > >=20 > > diff --git a/mm/hmm.c b/mm/hmm.c > > index 16b6731a34db..52ac59384268 100644 > > +++ b/mm/hmm.c > > @@ -205,6 +205,9 @@ static int hmm_invalidate_range_start(struct mmu_= notifier *mn, > > ret =3D -EAGAIN; > > break; > > } > > + WARN(ret, "%pS callback failed with %d in %sblockable context\n", > > + mirror->ops->sync_cpu_device_pagetables, ret, > > + update.blockable ? "" : "non-"); > > } > > up_read(&hmm->mirrors_sem); >=20 > Didn't I beat you to this? Very much possible, I think I didn't rebase this to linux-next before resending ... have an Reviewed-by: Daniel Vetter in case you need. Cheers, Daniel >=20 > list_for_each_entry(mirror, &hmm->mirrors, list) { > int rc; >=20 > rc =3D mirror->ops->sync_cpu_device_pagetables(mirror, &update); > if (rc) { > if (WARN_ON(update.blockable || rc !=3D -EAGAIN)) > continue; > ret =3D -EAGAIN; > break; > } > } >=20 > Thanks, > Jason --=20 Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch