linux-kernel - Re: [Linux-kernel-mentees][PATCH 2/2] sgi-gru: Remove uneccessary ifdef for CONFIG_HUGETLB

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Date:   Mon, 19 Aug 2019 01:21:40 +0530
From:   Bharath Vedartham <linux.bhar@...il.com>
To:     sivanich@....com, jhubbard@...dia.com
Cc:     jglisse@...hat.com, ira.weiny@...el.com,
        gregkh@...uxfoundation.org, arnd@...db.de,
        william.kucharski@...cle.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees][PATCH 2/2] sgi-gru: Remove uneccessary
 ifdef for CONFIG_HUGETLB_PAGE

CC'ing lkml.

On Mon, Aug 19, 2019 at 01:08:55AM +0530, Bharath Vedartham wrote:
> is_vm_hugetlb_page will always return false if CONFIG_HUGETLB_PAGE is
> not set.
> 
> 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: William Kucharski <william.kucharski@...cle.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel-mentees@...ts.linuxfoundation.org
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Reviewed-by: John Hubbard <jhubbard@...dia.com>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> Signed-off-by: Bharath Vedartham <linux.bhar@...il.com>
> ---
>  drivers/misc/sgi-gru/grufault.c | 21 +++++++++++----------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
> index 61b3447..bce47af 100644
> --- a/drivers/misc/sgi-gru/grufault.c
> +++ b/drivers/misc/sgi-gru/grufault.c
> @@ -180,11 +180,11 @@ 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 (unlikely(is_vm_hugetlb_page(vma)))
> +		*pageshift = HPAGE_SHIFT;
> +	else
> +		*pageshift = PAGE_SHIFT;
> +
>  	if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0)
>  		return -EFAULT;
>  	*paddr = page_to_phys(page);
> @@ -238,11 +238,12 @@ 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
> +
> +	if (unlikely(is_vm_hugetlb_page(vma)))
> +		*pageshift = HPAGE_SHIFT;
> +	else
> +		*pageshift = PAGE_SHIFT;
> +
>  	return 0;
>  
>  err:
> -- 
> 2.7.4
>