linux-kernel - Re: [PATCH v2 1/3] mm/mmu_notifier: use structure for invalidate_range

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Message-ID: <20181205164932.GI30615@quack2.suse.cz>
Date:   Wed, 5 Dec 2018 17:49:32 +0100
From:   Jan Kara <jack@...e.cz>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Jan Kara <jack@...e.cz>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Christian Koenig <christian.koenig@....com>,
        Felix Kuehling <felix.kuehling@....com>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>, kvm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] mm/mmu_notifier: use structure for
 invalidate_range_start/end callback

On Wed 05-12-18 11:40:52, Jerome Glisse wrote:
> On Wed, Dec 05, 2018 at 05:35:20PM +0100, Jan Kara wrote:
> > On Wed 05-12-18 00:36:26, jglisse@...hat.com wrote:
> > > diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> > > index 5119ff846769..5f6665ae3ee2 100644
> > > --- a/mm/mmu_notifier.c
> > > +++ b/mm/mmu_notifier.c
> > > @@ -178,14 +178,20 @@ int __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
> > >  				  unsigned long start, unsigned long end,
> > >  				  bool blockable)
> > >  {
> > > +	struct mmu_notifier_range _range, *range = &_range;
> > 
> > Why these games with two variables?
> 
> This is a temporary step i dediced to do the convertion in 2 steps,
> first i convert the callback to use the structure so that people
> having mmu notifier callback only have to review this patch and do
> not get distracted by the second step which update all the mm call
> site that trigger invalidation.
> 
> In the final result this code disappear. I did it that way to make
> the thing more reviewable. Sorry if that is a bit confusing.

Aha, right. Thanks for clarification. You can add:

Acked-by: Jan Kara <jack@...e.cz>

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR