linux-kernel - [PATCH v6 0/2] btrfs: Replace kmap() with kmap_local

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Message-Id: <20220706111520.12858-1-fmdefrancesco@gmail.com>
Date:   Wed,  6 Jul 2022 13:15:18 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        Nick Terrell <terrelln@...com>, linux-btrfs@...r.kernel.org,
        linux-mm@...ck.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
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>
Subject: [PATCH v6 0/2] btrfs: 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,
however, above all else, it has the purpose to conform the prototypes of
__kunmap_{local,atomic}() to their own correct semantics. Since those
functions don't make changes to the memory pointed by their arguments,
change the type of those arguments to become pointers to const void.

v5 -> v6: Delete an unnecessary assignment in 2/2 (thanks to Ira Weiny).

v4 -> v5: Use plain page_address() for pages which cannot come from Highmem
(instead of kmapping them); remove unnecessary initializations to NULL
in 2/2 (thanks to Ira Weiny).

v3 -> v4: Resend and add linux-mm to the list of recipients (thanks to
Andrew Morton).

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                      | 33 +++++++++++-----------------
 include/linux/highmem-internal.h     | 10 ++++-----
 mm/highmem.c                         |  2 +-
 5 files changed, 23 insertions(+), 30 deletions(-)

-- 
2.36.1