linux-kernel - Re: [PATCH 1/2] sparc: Fix handling of page table constructor failure

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Message-ID: <b761abc9-12de-f003-b8c4-26e7e506700e@redhat.com>
Date:   Wed, 25 Nov 2020 09:43:15 +0100
From:   David Hildenbrand <david@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        akpm@...ux-foundation.org
Cc:     davem@...emloft.net, rppt@...nel.org, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/2] sparc: Fix handling of page table constructor failure

On 25.11.20 04:46, Matthew Wilcox (Oracle) wrote:
> The page has just been allocated, so its refcount is 1.  free_unref_page()
> is for use on pages which have a zero refcount.  Use __free_page()
> like the other implementations of pte_alloc_one().
> 
> Fixes: 1ae9ae5f7df7 ("sparc: handle pgtable_page_ctor() fail")
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  arch/sparc/mm/init_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> index 96edf64d4fb3..182bb7bdaa0a 100644
> --- a/arch/sparc/mm/init_64.c
> +++ b/arch/sparc/mm/init_64.c
> @@ -2894,7 +2894,7 @@ pgtable_t pte_alloc_one(struct mm_struct *mm)
>  	if (!page)
>  		return NULL;
>  	if (!pgtable_pte_page_ctor(page)) {
> -		free_unref_page(page);
> +		__free_page(page);
>  		return NULL;
>  	}
>  	return (pte_t *) page_address(page);
> 

I wonder if reusing __pte_alloc_one() - e.g., internally - would be even
cleaner.

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb