Merge tag 'docs-5.3' of git://git.lwn.net/linux

Pull Documentation updates from Jonathan Corbet:
 "It's been a relatively busy cycle for docs:

   - A fair pile of RST conversions, many from Mauro. These create more
     than the usual number of simple but annoying merge conflicts with
     other trees, unfortunately. He has a lot more of these waiting on
     the wings that, I think, will go to you directly later on.

   - A new document on how to use merges and rebases in kernel repos,
     and one on Spectre vulnerabilities.

   - Various improvements to the build system, including automatic
     markup of function() references because some people, for reasons I
     will never understand, were of the opinion that
     :c:func:``function()`` is unattractive and not fun to type.

   - We now recommend using sphinx 1.7, but still support back to 1.4.

   - Lots of smaller improvements, warning fixes, typo fixes, etc"

* tag 'docs-5.3' of git://git.lwn.net/linux: (129 commits)
  docs: automarkup.py: ignore exceptions when seeking for xrefs
  docs: Move binderfs to admin-guide
  Disable Sphinx SmartyPants in HTML output
  doc: RCU callback locks need only _bh, not necessarily _irq
  docs: format kernel-parameters -- as code
  Doc : doc-guide : Fix a typo
  platform: x86: get rid of a non-existent document
  Add the RCU docs to the core-api manual
  Documentation: RCU: Add TOC tree hooks
  Documentation: RCU: Rename txt files to rst
  Documentation: RCU: Convert RCU UP systems to reST
  Documentation: RCU: Convert RCU linked list to reST
  Documentation: RCU: Convert RCU basic concepts to reST
  docs: filesystems: Remove uneeded .rst extension on toctables
  scripts/sphinx-pre-install: fix out-of-tree build
  docs: zh_CN: submitting-drivers.rst: Remove a duplicated Documentation/
  Documentation: PGP: update for newer HW devices
  Documentation: Add section about CPU vulnerabilities for Spectre
  Documentation: platform: Delete x86-laptop-drivers.txt
  docs: Note that :c:func: should no longer be used
  ...

1 files changed, 133 insertions, 0 deletions

diff --git a/Documentation/pcmcia/locking.rst b/Documentation/pcmcia/locking.rst
new file mode 100644
index 000000000000..e35257139c89
--- /dev/null
+++ b/Documentation/pcmcia/locking.rst
@@ -0,0 +1,133 @@
+=======
+Locking
+=======
+
+This file explains the locking and exclusion scheme used in the PCCARD
+and PCMCIA subsystems.
+
+
+A) Overview, Locking Hierarchy:
+===============================
+
+pcmcia_socket_list_rwsem
+	- protects only the list of sockets
+
+- skt_mutex
+	- serializes card insert / ejection
+
+  - ops_mutex
+	- serializes socket operation
+
+
+B) Exclusion
+============
+
+The following functions and callbacks to struct pcmcia_socket must
+be called with "skt_mutex" held::
+
+	socket_detect_change()
+	send_event()
+	socket_reset()
+	socket_shutdown()
+	socket_setup()
+	socket_remove()
+	socket_insert()
+	socket_early_resume()
+	socket_late_resume()
+	socket_resume()
+	socket_suspend()
+
+	struct pcmcia_callback	*callback
+
+The following functions and callbacks to struct pcmcia_socket must
+be called with "ops_mutex" held::
+
+	socket_reset()
+	socket_setup()
+
+	struct pccard_operations	*ops
+	struct pccard_resource_ops	*resource_ops;
+
+Note that send_event() and `struct pcmcia_callback *callback` must not be
+called with "ops_mutex" held.
+
+
+C) Protection
+=============
+
+1. Global Data:
+---------------
+struct list_head	pcmcia_socket_list;
+
+protected by pcmcia_socket_list_rwsem;
+
+
+2. Per-Socket Data:
+-------------------
+The resource_ops and their data are protected by ops_mutex.
+
+The "main" struct pcmcia_socket is protected as follows (read-only fields
+or single-use fields not mentioned):
+
+- by pcmcia_socket_list_rwsem::
+
+	struct list_head	socket_list;
+
+- by thread_lock::
+
+	unsigned int		thread_events;
+
+- by skt_mutex::
+
+	u_int			suspended_state;
+	void			(*tune_bridge);
+	struct pcmcia_callback	*callback;
+	int			resume_status;
+
+- by ops_mutex::
+
+	socket_state_t		socket;
+	u_int			state;
+	u_short			lock_count;
+	pccard_mem_map		cis_mem;
+	void __iomem 		*cis_virt;
+	struct { }		irq;
+	io_window_t		io[];
+	pccard_mem_map		win[];
+	struct list_head	cis_cache;
+	size_t			fake_cis_len;
+	u8			*fake_cis;
+	u_int			irq_mask;
+	void 			(*zoom_video);
+	int 			(*power_hook);
+	u8			resource...;
+	struct list_head	devices_list;
+	u8			device_count;
+	struct 			pcmcia_state;
+
+
+3. Per PCMCIA-device Data:
+--------------------------
+
+The "main" struct pcmcia_device is protected as follows (read-only fields
+or single-use fields not mentioned):
+
+
+- by pcmcia_socket->ops_mutex::
+
+	struct list_head	socket_device_list;
+	struct config_t		*function_config;
+	u16			_irq:1;
+	u16			_io:1;
+	u16			_win:4;
+	u16			_locked:1;
+	u16			allow_func_id_match:1;
+	u16			suspended:1;
+	u16			_removed:1;
+
+- by the PCMCIA driver::
+
+	io_req_t		io;
+	irq_req_t		irq;
+	config_req_t		conf;
+	window_handle_t		win;