16daf3d9ec
Sergey Ryazanov says: ==================== WWAN debugfs tweaks This is a follow-up series to just applied IOSM (and WWAN) debugfs interface support [1]. The series has two main goals: 1. move the driver-specific debugfs knobs to a subdirectory; 2. make the debugfs interface optional for both IOSM and for the WWAN core. As for the first part, I must say that it was my mistake. I suggested to place debugfs entries under a common per WWAN device directory. But I missed the driver subdirectory in the example, so it become: /sys/kernel/debugfs/wwan/wwan0/trace Since the traces collection is a driver-specific feature, it is better to keep it under the driver-specific subdirectory: /sys/kernel/debugfs/wwan/wwan0/iosm/trace It is desirable to be able to entirely disable the debugfs interface. It can be disabled for several reasons, including security and consumed storage space. See detailed rationale with usage example in the 4th patch. The changes themselves are relatively simple, but require a code rearrangement. So to make changes clear, I chose to split them into preparatory and main changes and properly describe each of them. IOSM part is compile-tested only since I do not have IOSM supported device, so it needs Ack from the driver developers. I would like to thank Johannes Berg and Leon Romanovsky. Their suggestions and comments helped a lot to rework the initial over-engineered solution to something less confusing and much more simple. Thanks! 1. https://lore.kernel.org/netdev/20211120162155.1216081-1-m.chetan.kumar@linux.intel.com 2. https://patchwork.kernel.org/project/netdevbpf/patch/20211204174033.950528-1-arnd@kernel.org/ ==================== Link: https://lore.kernel.org/r/20211207092140.19142-1-ryazanov.s.a@gmail.com Signed-off-by: Jakub Kicinski <kuba@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.