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c03475506e
At extent_io.c, in the read page and write page code paths, we are testing if the return value from btrfs_get_extent() can be NULL. However that is not possible, as btrfs_get_extent() always returns either an error pointer or a (non-NULL) pointer to an extent map structure. Everywhere else outside extent_io.c we never check for NULL, we always treat any returned value as a non-NULL pointer if it does not encode an error. So check only for the IS_ERR() case at extent_io.c. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.