From: David Rientjes <rientjes@google.com>
To: "Christian König" <christian.koenig@amd.com>
Cc: "Dimitri Sivanich" <sivanich@hpe.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Michal Hocko" <mhocko@suse.com>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Paul Mackerras" <paulus@samba.org>,
"Oded Gabbay" <oded.gabbay@gmail.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Joerg Roedel" <joro@8bytes.org>,
"Doug Ledford" <dledford@redhat.com>,
"Jani Nikula" <jani.nikula@linux.intel.com>,
"Mike Marciniszyn" <mike.marciniszyn@intel.com>,
"Sean Hefty" <sean.hefty@intel.com>,
"Dimitri Sivanich" <sivanich@sgi.com>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch 1/2] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks
Date: Thu, 14 Dec 2017 01:19:20 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.2.10.1712140118160.260574@chino.kir.corp.google.com> (raw)
In-Reply-To: <d6487124-b613-6614-f355-14b7388a8ae3@amd.com>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 1178 bytes --]
On Wed, 13 Dec 2017, Christian König wrote:
> > > > --- a/drivers/misc/sgi-gru/grutlbpurge.c
> > > > +++ b/drivers/misc/sgi-gru/grutlbpurge.c
> > > > @@ -298,6 +298,7 @@ struct gru_mm_struct
> > > > *gru_register_mmu_notifier(void)
> > > > return ERR_PTR(-ENOMEM);
> > > > STAT(gms_alloc);
> > > > spin_lock_init(&gms->ms_asid_lock);
> > > > + gms->ms_notifier.flags = 0;
> > > > gms->ms_notifier.ops = &gru_mmuops;
> > > > atomic_set(&gms->ms_refcnt, 1);
> > > > init_waitqueue_head(&gms->ms_wait_queue);
> > > > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
> > > There is a kzalloc() just above this:
> > > gms = kzalloc(sizeof(*gms), GFP_KERNEL);
> > >
> > > Is that not sufficient to clear the 'flags' field?
> > >
> > Absolutely, but whether it is better to explicitly document that the mmu
> > notifier has cleared flags, i.e. there are no blockable callbacks, is
> > another story. I can change it if preferred.
>
> Actually I would invert the new flag, in other words specify that an MMU
> notifier will never sleep.
>
Very good idea, I'll do that. I'll also move the flags member to ops as
Paolo suggested.
Thanks both!
next prev parent reply other threads:[~2017-12-14 9:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-11 22:11 [patch 1/2] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks David Rientjes
2017-12-11 22:11 ` [patch 2/2] mm, oom: avoid reaping only for mm's " David Rientjes
2017-12-11 22:23 ` [patch 1/2] mm, mmu_notifier: annotate mmu notifiers " Paolo Bonzini
2017-12-11 23:09 ` David Rientjes
2017-12-12 20:05 ` Dimitri Sivanich
2017-12-12 21:28 ` David Rientjes
2017-12-13 9:34 ` Christian König
2017-12-13 10:26 ` Tetsuo Handa
2017-12-13 10:37 ` Paolo Bonzini
2017-12-14 9:19 ` David Rientjes [this message]
2017-12-14 12:46 ` kbuild test robot
2017-12-14 21:30 ` [patch v2 " David Rientjes
2017-12-14 21:31 ` [patch v2 2/2] mm, oom: avoid reaping only for mm's " David Rientjes
2017-12-15 16:35 ` Michal Hocko
2017-12-15 21:46 ` David Rientjes
2017-12-15 8:42 ` [patch v2 1/2] mm, mmu_notifier: annotate mmu notifiers " Paolo Bonzini
2017-12-15 12:19 ` Christian König
2017-12-15 13:36 ` Dimitri Sivanich
2017-12-15 16:25 ` Michal Hocko
2017-12-16 6:21 ` Tetsuo Handa
2017-12-16 11:33 ` Michal Hocko
2017-12-15 23:04 ` Andrew Morton
2017-12-16 7:14 ` Tetsuo Handa
2017-12-16 11:36 ` Michal Hocko
2017-12-16 14:45 ` Tetsuo Handa
2017-12-16 9:10 ` Michal Hocko
2018-01-09 21:40 ` [patch -mm] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks fix fix David Rientjes
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.10.1712140118160.260574@chino.kir.corp.google.com \
--to=rientjes@google.com \
--cc=aarcange@redhat.com \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=alexander.deucher@amd.com \
--cc=benh@kernel.crashing.org \
--cc=boris.ostrovsky@oracle.com \
--cc=christian.koenig@amd.com \
--cc=dledford@redhat.com \
--cc=jani.nikula@linux.intel.com \
--cc=jglisse@redhat.com \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=mike.marciniszyn@intel.com \
--cc=oded.gabbay@gmail.com \
--cc=paulus@samba.org \
--cc=pbonzini@redhat.com \
--cc=rkrcmar@redhat.com \
--cc=sean.hefty@intel.com \
--cc=sivanich@hpe.com \
--cc=sivanich@sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).