linux-kernel - Re: [PATCH] mm: huge_memory: convert split_huge_pages

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Date:   Fri, 30 Dec 2022 08:14:33 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: huge_memory: convert split_huge_pages_all() to use a
 folio

On Thu, Dec 29, 2022 at 08:25:03PM +0800, Kefeng Wang wrote:
> -			if (!PageHead(page) || PageHuge(page) || !PageLRU(page))
> +			if (!folio_test_large(folio)
> +				|| folio_test_hugetlb(folio)
> +				|| !folio_test_lru(folio))
>  				goto next;

That is a completely illegible way of indenting this code!  There's
no visual cue when the condition stops and when the next statement
begins.  Try one of these:

			if (!folio_test_large(folio) ||
			    folio_test_hugetlb(folio) ||
			    !folio_test_lru(folio))
				goto next;

			if (!folio_test_large(folio) ||
					folio_test_hugetlb(folio) ||
					!folio_test_lru(folio))
				goto next;