linux-kernel - Re: [PATCH v13 010/137] mm: Add folio flag manipulation functions

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Date:   Wed, 14 Jul 2021 10:18:55 +0100
From:   David Howells <dhowells@...hat.com>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     dhowells@...hat.com, Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH v13 010/137] mm: Add folio flag manipulation functions

Johannes Weiner <hannes@...xchg.org> wrote:

> For example, in __set_page_dirty_no_writeback()
> 
> 	if (folio_is_dirty())
> 		return !folio_testset_dirty()
> 
> is less clear about what's going on than would be:
> 
> 	if (folio_test_dirty())
> 		return !folio_testset_dirty()

"if (folio_is_dirty())" reads better to me as that's more or less how you'd
structure a sentence beginning with "if" in English.

On the other hand, folio_test_xxx() fits in with a folio_testset_xxx() naming
style.  English doesn't really have test-and-set operator words.

David