linux-kernel - Re: [PATCH v2 13/25] fs: Add zero_user

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Date:   Tue, 18 Feb 2020 10:07:05 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/25] fs: Add zero_user_large

On Tue, Feb 18, 2020 at 08:10:52PM +0300, Kirill A. Shutemov wrote:
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Thanks

> > +#if defined(CONFIG_HIGHMEM) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
> > +void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
> > +               unsigned start2, unsigned end2);
> > +#else /* !HIGHMEM || !TRANSPARENT_HUGEPAGE */
> 
> This is a neat trick. I like it.
> 
> Although, it means non-inlined version will never get tested :/

I worry about that too, but I don't really want to incur the overhead on
platforms people actually use.