linux-kernel - Re: [PATCH v11 10/33] mm: Add folio flag manipulation functions

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Message-ID: <813817.1623837536@warthog.procyon.org.uk>
Date:   Wed, 16 Jun 2021 10:58:56 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...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>
Subject: Re: [PATCH v11 10/33] mm: Add folio flag manipulation functions

Matthew Wilcox (Oracle) <willy@...radead.org> wrote:

> These new functions are the folio analogues of the various PageFlags
> functions.  If CONFIG_DEBUG_VM_PGFLAGS is enabled, we check the folio
> is not a tail page at every invocation.  This will also catch the
> PagePoisoned case as a poisoned page has every bit set, which would
> include PageTail.
> 
> This saves 1684 bytes of text with the distro-derived config that
> I'm testing due to removing a double call to compound_head() in
> PageSwapCache().
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Layton <jlayton@...nel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>

Reviewed-by: David Howells <dhowells@...hat.com>