From: Miaohe Lin <linmiaohe@huawei.com>
To: Yang Shi <shy828301@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jerome Glisse <jglisse@redhat.com>,
Rafael Aquini <aquini@redhat.com>,
David Hildenbrand <david@redhat.com>,
Alistair Popple <apopple@nvidia.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH v2 1/5] mm/migrate.c: remove unnecessary VM_BUG_ON_PAGE on putback_movable_page()
Date: Wed, 24 Mar 2021 10:37:13 +0800 [thread overview]
Message-ID: <fffca253-87ba-6318-7039-2c0e88e2ffb1@huawei.com> (raw)
In-Reply-To: <CAHbLzkrde4fMZtt7g+5HJ8PftwwDBvg-8b=W4F_64_EK-CusUA@mail.gmail.com>
On 2021/3/24 1:58, Yang Shi wrote:
> On Tue, Mar 23, 2021 at 6:54 AM Miaohe Lin <linmiaohe@huawei.com> wrote:
>>
>> The !PageLocked() check is implicitly done in PageMovable(). Remove this
>> explicit one.
>
> TBH, I'm a little bit reluctant to have this kind change. If "locked"
> check is necessary we'd better make it explicit otherwise just remove
> it.
>
> And why not just remove all the 3 VM_BUG_ON_PAGE since
> putback_movable_page() is just called by putback_movable_pages() and
> we know the page is locked and both PageMovable and PageIsolated is
> checked right before calling putback_movable_page().
>
> And you also could make putback_movable_page() static.
>
Sounds good! Many thanks for your advice!
>> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
>> ---
>> mm/migrate.c | 1 -
>> 1 file changed, 1 deletion(-)
>>
>> diff --git a/mm/migrate.c b/mm/migrate.c
>> index 47df0df8f21a..facec65c7374 100644
>> --- a/mm/migrate.c
>> +++ b/mm/migrate.c
>> @@ -145,7 +145,6 @@ void putback_movable_page(struct page *page)
>> {
>> struct address_space *mapping;
>>
>> - VM_BUG_ON_PAGE(!PageLocked(page), page);
>> VM_BUG_ON_PAGE(!PageMovable(page), page);
>> VM_BUG_ON_PAGE(!PageIsolated(page), page);
>>
>> --
>> 2.19.1
>>
> .
>
next prev parent reply other threads:[~2021-03-24 2:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 13:54 [PATCH v2 0/5] Cleanup and fixup for mm/migrate.c Miaohe Lin
2021-03-23 13:54 ` [PATCH v2 1/5] mm/migrate.c: remove unnecessary VM_BUG_ON_PAGE on putback_movable_page() Miaohe Lin
2021-03-23 14:27 ` David Hildenbrand
2021-03-24 2:40 ` Miaohe Lin
2021-03-23 17:58 ` Yang Shi
2021-03-24 2:37 ` Miaohe Lin [this message]
2021-03-23 13:54 ` [PATCH v2 2/5] mm/migrate.c: remove unnecessary rc != MIGRATEPAGE_SUCCESS check in 'else' case Miaohe Lin
2021-03-23 17:46 ` Yang Shi
2021-03-23 13:54 ` [PATCH v2 3/5] mm/migrate.c: fix potential indeterminate pte entry in migrate_vma_insert_page() Miaohe Lin
2021-03-23 13:54 ` [PATCH v2 4/5] mm/migrate.c: use helper migrate_vma_collect_skip() in migrate_vma_collect_hole() Miaohe Lin
2021-03-23 13:54 ` [PATCH v2 5/5] mm/migrate.c: fix potential deadlock in NUMA balancing shared exec THP case Miaohe Lin
2021-03-23 17:17 ` Yang Shi
2021-03-24 1:16 ` Yang Shi
2021-03-24 2:14 ` Miaohe Lin
2021-03-24 2:03 ` Miaohe Lin
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