linux-kernel - Re: [RFC PATCH RESEND 23/28] x86/mm: define ARCH_SUPPORTS_PER_VMA

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Message-ID: <CAJuCfpEJxxm17fFJ1YVkOTBJbP5ce9ey90q_mCk_pkyTdHkrUg@mail.gmail.com>
Date:   Thu, 1 Sep 2022 16:17:33 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michel Lespinasse <michel@...pinasse.org>,
        Jerome Glisse <jglisse@...gle.com>,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Matthew Wilcox <willy@...radead.org>,
        "Liam R. Howlett" <liam.howlett@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Laurent Dufour <laurent.dufour@...ibm.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Song Liu <songliubraving@...com>, Peter Xu <peterx@...hat.com>,
        David Hildenbrand <david@...hat.com>, dhowells@...hat.com,
        Hugh Dickins <hughd@...gle.com>, bigeasy@...utronix.de,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Minchan Kim <minchan@...gle.com>,
        kernel-team <kernel-team@...roid.com>,
        linux-mm <linux-mm@...ck.org>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH RESEND 23/28] x86/mm: define ARCH_SUPPORTS_PER_VMA_LOCK

On Thu, Sep 1, 2022 at 1:21 PM Kent Overstreet
<kent.overstreet@...ux.dev> wrote:
>
> On Thu, Sep 01, 2022 at 10:35:11AM -0700, Suren Baghdasaryan wrote:
> > Set ARCH_SUPPORTS_PER_VMA_LOCK so that the per-VMA lock support can be
> > compiled on this architecture.
> >
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > ---
> >  arch/x86/Kconfig | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index f9920f1341c8..ee19de020b27 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -27,6 +27,7 @@ config X86_64
> >       # Options that are inherently 64-bit kernel only:
> >       select ARCH_HAS_GIGANTIC_PAGE
> >       select ARCH_SUPPORTS_INT128 if CC_HAS_INT128
> > +     select ARCH_SUPPORTS_PER_VMA_LOCK
> >       select ARCH_USE_CMPXCHG_LOCKREF
> >       select HAVE_ARCH_SOFT_DIRTY
> >       select MODULES_USE_ELF_RELA
>
> I think you could combine this with the previous path (and similarly on other
> architectures) - they logically go together.

Thanks for the feedback! I see no downside to that, so unless there
are objections I will combine them in the next version.