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

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Message-ID: <87d0vvirts.fsf@yhuang-dev.intel.com>
Date:   Tue, 10 Jul 2018 13:26:55 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.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

Dave Hansen <dave.hansen@...ux.intel.com> writes:

> 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.

Sure.  Will add it.

Best Regards,
Huang, Ying