linux-kernel - Re: Re: [PATCH v18 01/14] mm/page_ext: Export lookup_page

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Date:   Mon, 13 Jul 2020 14:21:43 +0200
From:   SeongJae Park <sjpark@...zon.com>
To:     Mike Rapoport <rppt@...nel.org>
CC:     SeongJae Park <sjpark@...zon.com>, <akpm@...ux-foundation.org>,
        "SeongJae Park" <sjpark@...zon.de>, <Jonathan.Cameron@...wei.com>,
        <aarcange@...hat.com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <amit@...nel.org>,
        <benh@...nel.crashing.org>, <brendan.d.gregg@...il.com>,
        <brendanhiggins@...gle.com>, <cai@....pw>,
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        <dwmw@...zon.com>, <foersleo@...zon.de>, <irogers@...gle.com>,
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        <shuah@...nel.org>, <sj38.park@...il.com>, <snu@...zon.de>,
        <vbabka@...e.cz>, <vdavydov.dev@...il.com>,
        <yang.shi@...ux.alibaba.com>, <ying.huang@...el.com>,
        <linux-damon@...zon.com>, <linux-mm@...ck.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v18 01/14] mm/page_ext: Export lookup_page_ext() to GPL modules

On Mon, 13 Jul 2020 15:08:42 +0300 Mike Rapoport <rppt@...nel.org> wrote:

> Hi,
> 
> On Mon, Jul 13, 2020 at 10:41:31AM +0200, SeongJae Park wrote:
> > From: SeongJae Park <sjpark@...zon.de>
> > 
> > This commit exports 'lookup_page_ext()' to GPL modules.  It will be used
> > by DAMON in following commit for the implementation of the region based
> > sampling.
> 
> Maybe I'm missing something, but why is DAMON a module?

I made it loadable just for easier adoption from downstream kernels.  I could
drop the module build support if asked.


Thanks,
SeongJae Park

> 
> > Signed-off-by: SeongJae Park <sjpark@...zon.de>
> > Reviewed-by: Leonard Foerster <foersleo@...zon.de>
> > Reviewed-by: Varad Gautam <vrd@...zon.de>
> > ---
> >  mm/page_ext.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/mm/page_ext.c b/mm/page_ext.c
> > index a3616f7a0e9e..9d802d01fcb5 100644
> > --- a/mm/page_ext.c
> > +++ b/mm/page_ext.c
> > @@ -131,6 +131,7 @@ struct page_ext *lookup_page_ext(const struct page *page)
> >  					MAX_ORDER_NR_PAGES);
> >  	return get_entry(base, index);
> >  }
> > +EXPORT_SYMBOL_GPL(lookup_page_ext);
> >  
> >  static int __init alloc_node_page_ext(int nid)
> >  {
> > -- 
> > 2.17.1
> > 
> 
> -- 
> Sincerely yours,
> Mike.