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[ Upstream commite4cc1483f3] At btrfs_drop_extent_map_range() we are clearing the EXTENT_FLAG_LOGGING bit on a 'flags' variable that was not initialized. This makes static checkers complain about it, so initialize the 'flags' variable before clearing the bit. In practice this has no consequences, because EXTENT_FLAG_LOGGING should not be set when btrfs_drop_extent_map_range() is called, as an fsync locks the inode in exclusive mode, locks the inode's mmap semaphore in exclusive mode too and it always flushes all delalloc. Also add a comment about why we clear EXTENT_FLAG_LOGGING on a copy of the flags of the split extent map. Reported-by: Dan Carpenter <error27@gmail.com> Link: https://lore.kernel.org/linux-btrfs/Y%2FyipSVozUDEZKow@kili/ Fixes:db21370bff("btrfs: drop extent map range more efficiently") Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.