linux-kernel - Re: [PATCH -mm -v4 02/21] mm, THP, swap: Make CONFIG_THP_SWAP depends on CONFIG

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Date:   Mon, 9 Jul 2018 18:59:14 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.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>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Daniel Jordan <daniel.m.jordan@...cle.com>
Subject: Re: [PATCH -mm -v4 02/21] mm, THP, swap: Make CONFIG_THP_SWAP depends
 on CONFIG_SWAP

On 07/09/2018 06:19 PM, Huang, Ying wrote:
> Dave Hansen <dave.hansen@...ux.intel.com> writes:
> 
>>>  config THP_SWAP
>>>  	def_bool y
>>> -	depends on TRANSPARENT_HUGEPAGE && ARCH_WANTS_THP_SWAP
>>> +	depends on TRANSPARENT_HUGEPAGE && ARCH_WANTS_THP_SWAP && SWAP
>>>  	help
>>
>> This seems like a bug-fix.  Is there a reason this didn't cause problems
>> up to now?
> Yes.  The original code has some problem in theory, but not in practice
> because all code enclosed by
> 
> #ifdef CONFIG_THP_SWAP
> #endif
> 
> are in swapfile.c.  But that will be not true in this patchset.

That's great info for the changelog.