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f8e9f4a76d
Add a comment to document the complicated locked_page unlock logic in cow_file_range_inline. The specifically tricky part is that a caller just up the stack converts ret == 0 to ret == 1 and then another caller far up the callstack handles ret == 1 as a success, AND returns without cleanup in that case, both of which "feel" unnatural and led to the original bug. Try to document that somewhat specific callstack logic here to explain the weird un-setting of locked_folio on success. Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Boris Burkov <boris@bur.io> 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 reStructuredText 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.