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Date:   Mon, 22 May 2023 08:27:14 +0100
From:   Lorenzo Stoakes <lstoakes@gmail.com>
To:     Hugh Dickins <hughd@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
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        David Hildenbrand <david@redhat.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Qi Zheng <zhengqi.arch@bytedance.com>,
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        Peter Xu <peterx@redhat.com>,
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        SeongJae Park <sj@kernel.org>,
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        Song Liu <song@kernel.org>,
        Thomas Hellstrom <thomas.hellstrom@linux.intel.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 12/31] mm/vmalloc: vmalloc_to_page() use
 pte_offset_kernel()
Message-ID: <8c744725-5f58-4656-823b-997a302085f6@lucifer.local>
References: <68a97fbe-5c1e-7ac6-72c-7b9c6290b370@google.com>
 <fc3c7ca1-6c9c-b6c-f4df-36f24b56139@google.com>
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On Sun, May 21, 2023 at 10:04:07PM -0700, Hugh Dickins wrote:
> vmalloc_to_page() was using pte_offset_map() (followed by pte_unmap()),
> but it's intended for userspace page tables: prefer pte_offset_kernel().
>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> ---
>  mm/vmalloc.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 9683573f1225..741722d247d5 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -703,11 +703,10 @@ struct page *vmalloc_to_page(const void *vmalloc_addr)
>  	if (WARN_ON_ONCE(pmd_bad(*pmd)))
>  		return NULL;
>
> -	ptep = pte_offset_map(pmd, addr);
> +	ptep = pte_offset_kernel(pmd, addr);
>  	pte = *ptep;
>  	if (pte_present(pte))
>  		page = pte_page(pte);
> -	pte_unmap(ptep);
>
>  	return page;
>  }
> --
> 2.35.3
>

Looks good to me,

Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>