linux-kernel - Re: [PATCH] mm/hugetlb: Drop __unmap_hugepage

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Message-ID: <b99f88db-edeb-fab1-803e-5e083594bec8@nvidia.com>
Date:   Thu, 16 Sep 2021 15:57:38 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH] mm/hugetlb: Drop __unmap_hugepage_range definition from
 hugetlb.h

On 9/16/21 14:28, Peter Xu wrote:
> Drop it in the header since it's only used in hugetlb.c.

Hi Peter,

Tiny documentation tweak: could the above line please be changed to
something approximately like this:

"Remove __unmap_hugepage_range() from the header file, because it is
only used in the .c file."

?

Because: "drop it in" is so close to "drop it into" (which means, "add
it to"), that it's actually reading a lot like the opposite of what you
intend to say.

> 
> Suggested-by: Mike Kravetz <mike.kravetz@...cle.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>   include/linux/hugetlb.h | 10 ----------
>   mm/hugetlb.c            |  6 +++---
>   2 files changed, 3 insertions(+), 13 deletions(-)


The change itself looks accurate for the current top of tree, so:

Reviewed-by: John Hubbard <jhubbard@...dia.com>


thanks,
-- 
John Hubbard
NVIDIA

> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 1faebe1cd0ed..3cbf60464398 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -143,9 +143,6 @@ void __unmap_hugepage_range_final(struct mmu_gather *tlb,
>   			  struct vm_area_struct *vma,
>   			  unsigned long start, unsigned long end,
>   			  struct page *ref_page);
> -void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
> -				unsigned long start, unsigned long end,
> -				struct page *ref_page);
>   void hugetlb_report_meminfo(struct seq_file *);
>   int hugetlb_report_node_meminfo(char *buf, int len, int nid);
>   void hugetlb_show_meminfo(void);
> @@ -385,13 +382,6 @@ static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
>   	BUG();
>   }
>   
> -static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
> -			struct vm_area_struct *vma, unsigned long start,
> -			unsigned long end, struct page *ref_page)
> -{
> -	BUG();
> -}
> -
>   static inline vm_fault_t hugetlb_fault(struct mm_struct *mm,
>   			struct vm_area_struct *vma, unsigned long address,
>   			unsigned int flags)
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 95dc7b83381f..d394d9545c4e 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -4426,9 +4426,9 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
>   	return ret;
>   }
>   
> -void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
> -			    unsigned long start, unsigned long end,
> -			    struct page *ref_page)
> +static void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
> +				   unsigned long start, unsigned long end,
> +				   struct page *ref_page)
>   {
>   	struct mm_struct *mm = vma->vm_mm;
>   	unsigned long address;
>