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Darrick J. Wong a01987cd90 fsdax: remove zeroing code from dax_unshare_iter [ Upstream commit `95472274b6` ] Remove the code in dax_unshare_iter that zeroes the destination memory because it's not necessary. If srcmap is unwritten, we don't have to do anything because that unwritten extent came from the regular file mapping, and unwritten extents cannot be shared. The same applies to holes. Furthermore, zeroing to unshare a mapping is just plain wrong because unsharing means copy on write, and we should be copying data. This is effectively a revert of commit `13dd4e0462` ("fsdax: unshare: zero destination if srcmap is HOLE or UNWRITTEN") Cc: ruansy.fnst@fujitsu.com Signed-off-by: Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/172796813311.1131942.16033376284752798632.stgit@frogsfrogsfrogs Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner <brauner@kernel.org> Stable-dep-of: `50793801fc` ("fsdax: dax_unshare_iter needs to copy entire blocks") Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-11-08 16:26:42 +01:00
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README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.