linux-kernel - Re: [PATCH -mm -V3 03/21] mm, THP, swap: Support PMD swap mapping in swap

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Date:   Wed, 13 Jun 2018 04:49:09 -0700
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shaohua Li <shli@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Zi Yan <zi.yan@...rutgers.edu>
Subject: Re: [PATCH -mm -V3 03/21] mm, THP, swap: Support PMD swap mapping in
 swap_duplicate()

On Wed, Jun 13, 2018 at 09:26:54AM +0800, Huang, Ying wrote:
> Daniel Jordan <daniel.m.jordan@...cle.com> writes:
> 
> > On Tue, Jun 12, 2018 at 09:23:19AM +0800, Huang, Ying wrote:
> >> Daniel Jordan <daniel.m.jordan@...cle.com> writes:
> >> >> +#else
> >> >> +static inline int __swap_duplicate_cluster(swp_entry_t *entry,
> >> >
> >> > This doesn't need inline.
> >> 
> >> Why not?  This is just a one line stub.
> >
> > Forgot to respond to this.  The compiler will likely choose to optimize out
> > calls to an empty function like this.  Checking, this is indeed what it does in
> > this case on my machine, with or without inline.
> 
> Yes.  I believe a decent compiler will inline the function in any way.
> And it does no harm to keep "inline" too, Yes?

Right, it does no harm, it's just a matter of style.