linux-kernel - [PATCH v4 0/2] Replace kmap() with kmap_local

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Message-Id: <20220616081133.14144-1-fmdefrancesco@gmail.com>
Date:   Thu, 16 Jun 2022 10:11:31 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     David Sterba <dsterba@...e.com>
Cc:     Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
        Nick Terrell <terrelln@...com>, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        John David Anglin <dave.anglin@...l.net>,
        linux-parisc@...r.kernel.org,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH v4 0/2] Replace kmap() with kmap_local_page() in zstd.c

This is a little series which serves the purpose to replace kmap() with
kmap_local_page() in btrfs/zstd.c. Actually this task is only
accomplished in patch 2/2. 

Instead patch 1/2 is a pre-requisite for the above-mentioned replacement,
but, above all else, it has the purpose to conform the prototypes of
__kunmap_{local,atomic}() to their own semantic. Since those functions
don't make changes to the memory pointed by their arguments, make those
arguments take pointers to const void.

This little series has version number 4, despite it's the first time the
two component patches have been re-united in a series. This may be a
questionable choice, however patch 1/2 should be at its v4 and patch 2/2
should be at its v3. I've tried to preserve the logs of version changes,
so, as said, this new series carries v4.

Furthermore, v4 is due to the fact that for v3 (where for the first time
the two above-mentioned patches had been united in a series) I forgot to
Cc several Maintainers and lists related to patch 1/2.

Sorry for the noise I provided to whom have received this same series
twice with no changes at all.

Fabio M. De Francesco (2):
  highmem: Make __kunmap_{local,atomic}() take "const void *"
  btrfs: Replace kmap() with kmap_local_page() in zstd.c

 arch/parisc/include/asm/cacheflush.h |  6 ++--
 arch/parisc/kernel/cache.c           |  2 +-
 fs/btrfs/zstd.c                      | 42 +++++++++++++++-------------
 include/linux/highmem-internal.h     | 10 +++----
 mm/highmem.c                         |  2 +-
 5 files changed, 33 insertions(+), 29 deletions(-)

-- 
2.36.1