032000264c
It is useful for debugging purpose to dump a vsp1_pipeline to the kernel log. Add a new function to do so, and use it when initializing the video and DRM pipelines. As __vsp1_pipeline_dump() needs to construct the log message iteratively, it uses pr_cont(...) (exact equivalent to the more verbose "printk(KERN_CONT ..."). The function thus can't use dev_dbg() to log the initial part of the message, for two reasons: - pr_cont() doesn't seem to work with dev_*(). Even if the format string passed to dev_*() doesn't end with a '\n', pr_cont() starts a new line in the log. This behaviour doesn't seem to be clearly documented, and may or may not be on purpose. - Messages printed by dev_dbg() may be omitted if dynamic debugging is enabled. In that case, the continuation messages will still be printed, leading to confusing log messages. To still benefit from the dynamic debug infrastructure, we declare a vsp1_pipeline_dump() macro that uses _dynamic_func_call() when dynamic debugging is enabled. The whole vsp1_pipeline_dump() call can be selected at runtime. The __vsp1_pipeline_dump() function then uses a plain "printk(KERN_DEBUG ...)" to print the message header using the debug log level, and pr_cont() to print the rest of the message on the same line. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo.mondi+renesas@ideasonboard.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.