Thank you for the feedback. I understand — checkpatch should only be used on patches, not to find and fix pre-existing style issues in existing code. I'll keep this in mind for future submissions. Sorry for the noise.

________________________________
发件人: Vlastimil Babka (SUSE) <vbabka@kernel.org>
发送时间: 2026年4月16日 14:40:31
收件人: Xiang Gao; akpm@linux-foundation.org
抄送: surenb@google.com; mhocko@suse.com; jackmanb@google.com; hannes@cmpxchg.org; ziy@nvidia.com; linux-mm@kvack.org; linux-kernel@vger.kernel.org; 高翔
主题: [External Mail]Re: [PATCH] mm/page_alloc: fix spaces used for indentation instead of tabs

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On 4/16/26 04:19, Xiang Gao wrote:
> From: Xiang Gao <gaoxiang17@xiaomi.com>
>
> checkpatch.pl reports two indentation errors in page_alloc.c where
> spaces are used instead of tabs:

checkpatch should not be used on existing source files, only on patches
changing them for another reason. There are many pre-existing things that
would be flagged and we don't want the churn. So we only use checkpatch to
avoid introducing new mistakes, and only fix the pre-existing ones when
changing the code for another reason.

>   ERROR: code indent should use tabs where possible
>   #887: FILE: mm/page_alloc.c:887:
>   +        VM_WARN_ONCE(get_pageblock_migratetype(page) != migratetype,$
>
>   ERROR: code indent should use tabs where possible
>   #6626: FILE: mm/page_alloc.c:6626:
>   +                                                    sysctl_min_unmapped_ratio) / 100;$
>
> In __del_page_from_free_list(), the VM_WARN_ONCE at line 887 uses 8
> spaces for indentation instead of a tab. The identical VM_WARN_ONCE
> calls in __add_to_free_list() and move_to_free_list() both correctly
> use a tab.
>
> In setup_min_unmapped_ratio(), the continuation line at 6626 uses 6
> tabs + 9 spaces for alignment. Replace the excess spaces with 6 tabs
> + 1 space to correctly align with the opening parenthesis on the
> previous line.
>
> Signed-off-by: gaoxiang17 <gaoxiang17@xiaomi.com>
> ---
>  mm/page_alloc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 2d4b6f1a554e..752673a9b43c 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -884,7 +884,7 @@ static inline void __del_page_from_free_list(struct page *page, struct zone *zon
>  {
>       int nr_pages = 1 << order;
>
> -        VM_WARN_ONCE(get_pageblock_migratetype(page) != migratetype,
> +     VM_WARN_ONCE(get_pageblock_migratetype(page) != migratetype,
>                    "page type is %d, passed migratetype is %d (nr=%d)\n",
>                    get_pageblock_migratetype(page), migratetype, nr_pages);
>
> @@ -6623,7 +6623,7 @@ static void setup_min_unmapped_ratio(void)
>
>       for_each_zone(zone)
>               zone->zone_pgdat->min_unmapped_pages += (zone_managed_pages(zone) *
> -                                                      sysctl_min_unmapped_ratio) / 100;
> +                                              sysctl_min_unmapped_ratio) / 100;
>  }
>
>