linux-kernel - Re: [PATCH 1/4] mm: hugetlb: use flush_hugetlb_tlb_range() in move_hugetlb_page

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Message-ID: <20230731234027.GB39768@monkey>
Date:   Mon, 31 Jul 2023 16:40:27 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Mina Almasry <almasrymina@...gle.com>, kirill@...temov.name,
        joel@...lfernandes.org, william.kucharski@...cle.com,
        kaleshsingh@...gle.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] mm: hugetlb: use flush_hugetlb_tlb_range() in
 move_hugetlb_page_tables()

On 07/31/23 15:48, Kefeng Wang wrote:
> Archs may need to do special things when flushing hugepage tlb,
> so use the more applicable flush_hugetlb_tlb_range() instead of
> flush_tlb_range().
> 
> Fixes: 550a7d60bd5e ("mm, hugepages: add mremap() support for hugepage backed vma")
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

Thanks!

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>

Although, I missed this in 550a7d60bd5e :(

Looks like only powerpc provides an arch specific flush_hugetlb_tlb_range
today.
-- 
Mike Kravetz

> ---
>  mm/hugetlb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 64a3239b6407..ac876bfba340 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -5281,9 +5281,9 @@ int move_hugetlb_page_tables(struct vm_area_struct *vma,
>  	}
>  
>  	if (shared_pmd)
> -		flush_tlb_range(vma, range.start, range.end);
> +		flush_hugetlb_tlb_range(vma, range.start, range.end);
>  	else
> -		flush_tlb_range(vma, old_end - len, old_end);
> +		flush_hugetlb_tlb_range(vma, old_end - len, old_end);
>  	mmu_notifier_invalidate_range_end(&range);
>  	i_mmap_unlock_write(mapping);
>  	hugetlb_vma_unlock_write(vma);
> -- 
> 2.41.0
>