linux-kernel - Re: [PATCH v6 08/27] mm: Create FolioFlags

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Message-ID: <20210406133434.GG3062550@infradead.org>
Date:   Tue, 6 Apr 2021 14:34:34 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-cachefs@...hat.com,
        linux-afs@...ts.infradead.org
Subject: Re: [PATCH v6 08/27] mm: Create FolioFlags

On Wed, Mar 31, 2021 at 07:47:09PM +0100, Matthew Wilcox (Oracle) wrote:
> These new functions are the folio analogues of the PageFlags functions.
> If CONFIG_DEBUG_VM_PGFLAGS is enabled, we check the folio is not a tail
> page at every invocation.  Note that this will also catch the PagePoisoned
> case as a poisoned page has every bit set, which would include PageTail.
> 
> This saves 1727 bytes of text with the distro-derived config that
> I'm testing due to removing a double call to compound_head() in
> PageSwapCache().

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>