linux-kernel - Re: [PATCH] mm/huge_memory.c: Remove unnecessary local variable ret2

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Message-ID: <44fad17d-7f40-3b82-0015-37a951ecb0f9@huawei.com>
Date:   Mon, 8 Mar 2021 18:36:46 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/huge_memory.c: Remove unnecessary local variable ret2

Hi:
On 2021/2/10 15:24, Miaohe Lin wrote:
> There is no need to use a new local variable ret2 to get the return value
> of handle_userfault(). Use ret directly to make code more succinct.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>

friendly ping in case it's forgotten. :)

> ---
>  mm/huge_memory.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 395c75111d33..caf552834dbb 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -624,14 +624,12 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
>  
>  		/* Deliver the page fault to userland */
>  		if (userfaultfd_missing(vma)) {
> -			vm_fault_t ret2;
> -
>  			spin_unlock(vmf->ptl);
>  			put_page(page);
>  			pte_free(vma->vm_mm, pgtable);
> -			ret2 = handle_userfault(vmf, VM_UFFD_MISSING);
> -			VM_BUG_ON(ret2 & VM_FAULT_FALLBACK);
> -			return ret2;
> +			ret = handle_userfault(vmf, VM_UFFD_MISSING);
> +			VM_BUG_ON(ret & VM_FAULT_FALLBACK);
> +			return ret;
>  		}
>  
>  		entry = mk_huge_pmd(page, vma->vm_page_prot);
>