linux-kernel - Re: [External] Re: [PATCH v13 02/12] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE

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Date:   Mon, 25 Jan 2021 10:47:31 -0800 (PST)
From:   David Rientjes <rientjes@...gle.com>
To:     Muchun Song <songmuchun@...edance.com>
cc:     Randy Dunlap <rdunlap@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, viro@...iv.linux.org.uk,
        Andrew Morton <akpm@...ux-foundation.org>, paulmck@...nel.org,
        mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com,
        oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de,
        Mina Almasry <almasrymina@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...e.com>,
        "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        David Hildenbrand <david@...hat.com>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>,
        Xiongchun duan <duanxiongchun@...edance.com>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [External] Re: [PATCH v13 02/12] mm: hugetlb: introduce a new
 config HUGETLB_PAGE_FREE_VMEMMAP

On Mon, 25 Jan 2021, Muchun Song wrote:

> > >> I'm not sure I understand the rationale for providing this help text if
> > >> this is def_bool depending on CONFIG_HUGETLB_PAGE.  Are you intending that
> > >> this is actually configurable and we want to provide guidance to the admin
> > >> on when to disable it (which it currently doesn't)?  If not, why have the
> > >> help text?
> > >
> > > This is __not__ configurable. Seems like a comment to help others
> > > understand this option. Like Randy said.
> >
> > Yes, it could be written with '#' (or "comment") comment syntax instead of as help text.
> 
> Got it. I will update in the next version. Thanks.
> 

I'm not sure that Kconfig is the right place to document functional 
behavior of the kernel, especially for non-configurable options.  Seems 
like this is already served by existing comments added by this patch 
series in the files where the description is helpful.