linux-kernel - Re: [PATCH] mm: huge_pte_offset() returns pte

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Message-ID: <bd0ac181-7334-9970-b16a-ce7fd78d30ec@oracle.com>
Date:   Mon, 28 Oct 2019 14:55:13 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Ben Dooks (Codethink)" <ben.dooks@...ethink.co.uk>,
        linux-kernel@...ts.codethink.co.uk
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: huge_pte_offset() returns pte_t *, not integer

Cc: Andrew
There are already a few hugetlbfs cleanups in the mm tree.

On 10/16/19 2:51 AM, Ben Dooks (Codethink) wrote:
> The huge_pte_offset() returns a pte_t *, not an integer
> so when huge-tlb is off, the replacement inline macro
> should return a pte_t * too.
> 
> This fixes the following sparse warning:
> 
> mm/page_vma_mapped.c:156:29: warning: Using plain integer as NULL pointer
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>

That is simple enough,
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz

> ---
> Cc: Mike Kravetz <mike.kravetz@...cle.com>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  include/linux/hugetlb.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 53fc34f930d0..e42c76aa1577 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -185,7 +185,7 @@ static inline void hugetlb_show_meminfo(void)
>  #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
>  #define hugetlb_mcopy_atomic_pte(dst_mm, dst_pte, dst_vma, dst_addr, \
>  				src_addr, pagep)	({ BUG(); 0; })
> -#define huge_pte_offset(mm, address, sz)	0
> +#define huge_pte_offset(mm, address, sz)	(pte_t *)NULL
>  
>  static inline bool isolate_huge_page(struct page *page, struct list_head *list)
>  {
>