linux-kernel - Re: [PATCH v3 1/6] mm/thp: add prep_transhuge_device_private

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Date:   Fri, 6 Nov 2020 08:55:54 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     linux-mm@...ck.org, nouveau@...ts.freedesktop.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Alistair Popple <apopple@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Jason Gunthorpe <jgg@...dia.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Zi Yan <ziy@...dia.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Ben Skeggs <bskeggs@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/6] mm/thp: add prep_transhuge_device_private_page()

On Thu, Nov 05, 2020 at 04:51:42PM -0800, Ralph Campbell wrote:
> +extern void prep_transhuge_device_private_page(struct page *page);

No need for the extern.

> +static inline void prep_transhuge_device_private_page(struct page *page)
> +{
> +}

Is the code to call this even reachable if THP support is configured
out?  If not just declaring it unconditionally and letting dead code
elimination do its job might be a tad cleaner.

> +void prep_transhuge_device_private_page(struct page *page)

I think a kerneldoc comment explaining what this function is useful for
would be helpful.