[RESEND PATCH v4 0/2] btrfs: Replace kmap() with kmap_local_page() in zstd.c

Fabio M. De Francesco
2022-06-16T21:01:06Z

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 correct semantic. 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.

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.

v4 is due to the fact that, when I sent v3, I forgot to Cc several people
and mailing lists. Furthermore, Andrew M. made me notice that I've made
confusion with the tree structure: this is why now I have to send this
series again.

I want to apologize for the noise to people who have received these two
patches more times than it should have been.

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(-)

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2.36.1