linux-kernel - Re: [PATCH] mm/Kconfig: additional help text for HMM

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Date:   Fri, 19 Jul 2019 05:00:43 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Pavel Machek <pavel@....cz>, Christoph Hellwig <hch@...radead.org>,
        john.hubbard@...il.com, SCheung@...dia.com,
        akpm@...ux-foundation.org, aneesh.kumar@...ux.vnet.ibm.com,
        benh@...nel.crashing.org, bsingharora@...il.com,
        dan.j.williams@...el.com, dnellans@...dia.com,
        ebaskakov@...dia.com, hannes@...xchg.org, jglisse@...hat.com,
        jhubbard@...dia.com, kirill.shutemov@...ux.intel.com,
        linux-kernel@...r.kernel.org, liubo95@...wei.com,
        mhairgrove@...dia.com, mhocko@...nel.org,
        paulmck@...ux.vnet.ibm.com, ross.zwisler@...ux.intel.com,
        sgutti@...dia.com, torvalds@...ux-foundation.org,
        vdavydov.dev@...il.com
Subject: Re: [PATCH] mm/Kconfig: additional help text for HMM_MIRROR option

On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
> It is like MMU_NOTIFIERS, if something needs it, then it will select
> it.
> 
> Maybe it should just be a hidden kconfig anyhow as there is no reason
> to turn it on without also turning on a using driver.

We can't just select it due to the odd X86_64 || PPC64 dependency.

Which also answers Pavels question:  you never really need it, as we
can only use it for optional functionality due to that.