linux-kernel - Re: [PATCH 2/3] btrfs: Replace kmap() with kmap_local

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Message-ID: <YpY580+u9UU7XJX2@infradead.org>
Date:   Tue, 31 May 2022 08:53:23 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Ira Weiny <ira.weiny@...el.com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] btrfs: Replace kmap() with kmap_local_page() in lzo.c

On Tue, May 31, 2022 at 04:53:34PM +0200, Fabio M. De Francesco wrote:
> The use of kmap() is being deprecated in favor of kmap_local_page() where
> it is feasible. With kmap_local_page(), the mapping is per thread, CPU
> local and not globally visible.
> 
> Therefore, use kmap_local_page() / kunmap_local() in lzo.c wherever the
> mappings are per thread and not globally visible.

This looks fine:

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