linux-ext4 - Re: [PATCH v5 7/9] iomap/xfs: Eliminate the iomap

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Message-ID: <Y7XOoZNxZCpjCJLH@casper.infradead.org>
Date:   Wed, 4 Jan 2023 19:08:17 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Darrick J. Wong" <djwong@...nel.org>
Cc:     Andreas Gruenbacher <agruenba@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com
Subject: Re: [PATCH v5 7/9] iomap/xfs: Eliminate the iomap_valid handler

On Wed, Jan 04, 2023 at 09:53:17AM -0800, Darrick J. Wong wrote:
> I wonder if this should be reworked a bit to reduce indenting:
> 
> 	if (PTR_ERR(folio) == -ESTALE) {

FYI this is a bad habit to be in.  The compiler can optimise

	if (folio == ERR_PTR(-ESTALE))

better than it can optimise the other way around.