Re: [External] [PATCH v1] hugetlb: pass head page to remove_hugetlb_page()

[Muchun Song]

On Thu, May 27, 2021 at 7:53 AM Naoya Horiguchi <nao.horiguchi@xxxxxxxxx> wrote:
>
> From: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
>
> When memory_failure() or soft_offline_page() is called on a tail page of
> some hugetlb page, "BUG: unable to handle page fault" error can be
> triggered.
>
> remove_hugetlb_page() dereferences page->lru, so it's assumed that the
> page points to a head page, but one of the caller,
> dissolve_free_huge_page(), provides remove_hugetlb_page() with 'page'
> which could be a tail page.  So pass 'head' to it, instead.
>
> Fixes: 6eb4e88a6d27 ("hugetlb: create remove_hugetlb_page() to separate functionality")
> Signed-off-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>

Thanks Naoya!

Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>