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In contrast to the num_writers and num_extwriters wait events, the condition for the pending ordered wait event is signaled in a different context from the wait event itself. The condition signaling occurs in btrfs_remove_ordered_extent() in fs/btrfs/ordered-data.c while the wait event is implemented in btrfs_commit_transaction() in fs/btrfs/transaction.c Thus the thread signaling the condition has to acquire the lockdep map as a reader at the start of btrfs_remove_ordered_extent() and release it after it has signaled the condition. In this case some dependencies might be left out due to the placement of the annotation, but it is better than no annotation at all. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Ioannis Angelakopoulos <iangelak@fb.com> Reviewed-by: David Sterba <dsterba@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.