linux-kernel - Re: [PATCH 2/3] sgi-gru: Remove CONFIG_HUGETLB

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Message-ID: <9b510a41-7ce1-b2b7-d3c6-f6f0305e10ea@nvidia.com>
Date:   Sun, 21 Jul 2019 19:34:28 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Bharath Vedartham <linux.bhar@...il.com>, <arnd@...db.de>,
        <sivanich@....com>, <gregkh@...uxfoundation.org>
CC:     <ira.weiny@...el.com>, <jglisse@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 2/3] sgi-gru: Remove CONFIG_HUGETLB_PAGE ifdef

On 7/21/19 8:58 AM, Bharath Vedartham wrote:
> is_vm_hugetlb_page has checks for whether CONFIG_HUGETLB_PAGE is defined
> or not. If CONFIG_HUGETLB_PAGE is not defined is_vm_hugetlb_page will
> always return false. There is no need to have an uneccessary
> CONFIG_HUGETLB_PAGE check in the code.
> 
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: Jérôme Glisse <jglisse@...hat.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Dimitri Sivanich <sivanich@....com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-mm@...ck.org
> Signed-off-by: Bharath Vedartham <linux.bhar@...il.com>
> ---
>  drivers/misc/sgi-gru/grufault.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
> index 61b3447..75108d2 100644
> --- a/drivers/misc/sgi-gru/grufault.c
> +++ b/drivers/misc/sgi-gru/grufault.c
> @@ -180,11 +180,8 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
>  {
>  	struct page *page;
>  
> -#ifdef CONFIG_HUGETLB_PAGE
>  	*pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
> -#else
> -	*pageshift = PAGE_SHIFT;
> -#endif
> +
>  	if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0)
>  		return -EFAULT;
>  	*paddr = page_to_phys(page);
> @@ -238,11 +235,9 @@ static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
>  		return 1;
>  
>  	*paddr = pte_pfn(pte) << PAGE_SHIFT;
> -#ifdef CONFIG_HUGETLB_PAGE
> +
>  	*pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
> -#else
> -	*pageshift = PAGE_SHIFT;
> -#endif
> +
>  	return 0;
>  
>  err:
> 

Looks like an accurate cleanup to me.

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

thanks,
-- 
John Hubbard
NVIDIA