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

[Bharath Vedartham]

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@xxxxxxxxx>
> Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Dimitri Sivanich <sivanich@xxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: William Kucharski <william.kucharski@xxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-kernel-mentees@xxxxxxxxxxxxxxxxxxxxxxxxx
> Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
> Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
> Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
> Signed-off-by: Bharath Vedartham <linux.bhar@xxxxxxxxx>
> ---
>  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
>