linux-kernel - Re: [PATCH 3/7] mm/khugepaged: trivial typo and codestyle cleanup

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Date:   Tue, 14 Jun 2022 17:23:24 -0700
From:   Zach O'Keefe <zokeefe@...gle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, aarcange@...hat.com,
        willy@...radead.org, vbabka@...e.cz, dhowells@...hat.com,
        neilb@...e.de, apopple@...dia.com, david@...hat.com,
        surenb@...gle.com, peterx@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] mm/khugepaged: trivial typo and codestyle cleanup

On 11 Jun 16:47, Miaohe Lin wrote:
> Fix some typos and tweak the code to meet codestyle. No functional
> change intended.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/khugepaged.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index a8adb2d1e9c6..1b5dd3820eac 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -260,7 +260,7 @@ static ssize_t khugepaged_max_ptes_none_store(struct kobject *kobj,
>  	unsigned long max_ptes_none;
>  
>  	err = kstrtoul(buf, 10, &max_ptes_none);
> -	if (err || max_ptes_none > HPAGE_PMD_NR-1)
> +	if (err || max_ptes_none > HPAGE_PMD_NR - 1)
>  		return -EINVAL;
>  
>  	khugepaged_max_ptes_none = max_ptes_none;
> @@ -286,7 +286,7 @@ static ssize_t khugepaged_max_ptes_swap_store(struct kobject *kobj,
>  	unsigned long max_ptes_swap;
>  
>  	err  = kstrtoul(buf, 10, &max_ptes_swap);
> -	if (err || max_ptes_swap > HPAGE_PMD_NR-1)
> +	if (err || max_ptes_swap > HPAGE_PMD_NR - 1)
>  		return -EINVAL;
>  
>  	khugepaged_max_ptes_swap = max_ptes_swap;
> @@ -313,7 +313,7 @@ static ssize_t khugepaged_max_ptes_shared_store(struct kobject *kobj,
>  	unsigned long max_ptes_shared;
>  
>  	err  = kstrtoul(buf, 10, &max_ptes_shared);
> -	if (err || max_ptes_shared > HPAGE_PMD_NR-1)
> +	if (err || max_ptes_shared > HPAGE_PMD_NR - 1)
>  		return -EINVAL;
>  
>  	khugepaged_max_ptes_shared = max_ptes_shared;
> @@ -599,7 +599,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
>  	int none_or_zero = 0, shared = 0, result = 0, referenced = 0;
>  	bool writable = false;
>  
> -	for (_pte = pte; _pte < pte+HPAGE_PMD_NR;
> +	for (_pte = pte; _pte < pte + HPAGE_PMD_NR;
>  	     _pte++, address += PAGE_SIZE) {
>  		pte_t pteval = *_pte;
>  		if (pte_none(pteval) || (pte_present(pteval) &&
> @@ -1216,7 +1216,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
>  
>  	memset(khugepaged_node_load, 0, sizeof(khugepaged_node_load));
>  	pte = pte_offset_map_lock(mm, pmd, address, &ptl);
> -	for (_address = address, _pte = pte; _pte < pte+HPAGE_PMD_NR;
> +	for (_address = address, _pte = pte; _pte < pte + HPAGE_PMD_NR;
>  	     _pte++, _address += PAGE_SIZE) {
>  		pte_t pteval = *_pte;
>  		if (is_swap_pte(pteval)) {
> @@ -1306,7 +1306,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
>  		/*
>  		 * Check if the page has any GUP (or other external) pins.
>  		 *
> -		 * Here the check is racy it may see totmal_mapcount > refcount
> +		 * Here the check is racy it may see total_mapcount > refcount
>  		 * in some cases.
>  		 * For example, one process with one forked child process.
>  		 * The parent has the PMD split due to MADV_DONTNEED, then
> @@ -1557,7 +1557,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
>  		 * mmap_write_lock(mm) as PMD-mapping is likely to be split
>  		 * later.
>  		 *
> -		 * Not that vma->anon_vma check is racy: it can be set up after
> +		 * Note that vma->anon_vma check is racy: it can be set up after
>  		 * the check but before we took mmap_lock by the fault path.
>  		 * But page lock would prevent establishing any new ptes of the
>  		 * page, so we are safe.
> -- 
> 2.23.0
> 
> 

Reviewed-by: Zach O'Keefe <zokeefe@...gle.com>