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

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Message-ID: <87vaano4rl.fsf@yhuang-dev.intel.com>
Date:   Wed, 13 Jun 2018 09:26:54 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.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()

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?

> By the way, when building without CONFIG_THP_SWAP, we get
>
>   linux/mm/swapfile.c:933:13: warning: ‘__swap_free_cluster’ defined but not used [-Wunused-function]
>    static void __swap_free_cluster(struct swap_info_struct *si, unsigned long idx)
>                ^~~~~~~~~~~~~~~~~~~

Thanks!  I will fix this.  Don't know why 0-Day didn't catch this.

Best Regards,
Huang, Ying