Merge tag 'docs-4.16' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "Documentation updates for 4.16.

  New stuff includes refcount_t documentation, errseq documentation,
  kernel-doc support for nested structure definitions, the removal of
  lots of crufty kernel-doc support for unused formats, SPDX tag
  documentation, the beginnings of a manual for subsystem maintainers,
  and lots of fixes and updates.

  As usual, some of the changesets reach outside of Documentation/ to
  effect kerneldoc comment fixes. It also adds the new LICENSES
  directory, of which Thomas promises I do not need to be the
  maintainer"

* tag 'docs-4.16' of git://git.lwn.net/linux: (65 commits)
  linux-next: docs-rst: Fix typos in kfigure.py
  linux-next: DOC: HWPOISON: Fix path to debugfs in hwpoison.txt
  Documentation: Fix misconversion of #if
  docs: add index entry for networking/msg_zerocopy
  Documentation: security/credentials.rst: explain need to sort group_list
  LICENSES: Add MPL-1.1 license
  LICENSES: Add the GPL 1.0 license
  LICENSES: Add Linux syscall note exception
  LICENSES: Add the MIT license
  LICENSES: Add the BSD-3-clause "Clear" license
  LICENSES: Add the BSD 3-clause "New" or "Revised" License
  LICENSES: Add the BSD 2-clause "Simplified" license
  LICENSES: Add the LGPL-2.1 license
  LICENSES: Add the LGPL 2.0 license
  LICENSES: Add the GPL 2.0 license
  Documentation: Add license-rules.rst to describe how to properly identify file licenses
  scripts: kernel_doc: better handle show warnings logic
  fs/*/Kconfig: drop links to 404-compliant http://acl.bestbits.at
  doc: md: Fix a file name to md-fault.c in fault-injection.txt
  errseq: Add to documentation tree
  ...

3 files changed, 41 insertions, 35 deletions

diff --git a/lib/errseq.c b/lib/errseq.c
index 79cc66897db4..df782418b333 100644
--- a/lib/errseq.c
+++ b/lib/errseq.c
@@ -46,14 +46,14 @@
  * @eseq: errseq_t field that should be set
  * @err: error to set (must be between -1 and -MAX_ERRNO)
  *
- * This function sets the error in *eseq, and increments the sequence counter
+ * This function sets the error in @eseq, and increments the sequence counter
  * if the last sequence was sampled at some point in the past.
  *
  * Any error set will always overwrite an existing error.
  *
- * We do return the latest value here, primarily for debugging purposes. The
- * return value should not be used as a previously sampled value in later calls
- * as it will not have the SEEN flag set.
+ * Return: The previous value, primarily for debugging purposes. The
+ * return value should not be used as a previously sampled value in later
+ * calls as it will not have the SEEN flag set.
  */
 errseq_t errseq_set(errseq_t *eseq, int err)
 {
@@ -108,11 +108,13 @@ errseq_t errseq_set(errseq_t *eseq, int err)
 EXPORT_SYMBOL(errseq_set);
 
 /**
- * errseq_sample - grab current errseq_t value
- * @eseq: pointer to errseq_t to be sampled
+ * errseq_sample() - Grab current errseq_t value.
+ * @eseq: Pointer to errseq_t to be sampled.
  *
  * This function allows callers to sample an errseq_t value, marking it as
  * "seen" if required.
+ *
+ * Return: The current errseq value.
  */
 errseq_t errseq_sample(errseq_t *eseq)
 {
@@ -134,15 +136,15 @@ errseq_t errseq_sample(errseq_t *eseq)
 EXPORT_SYMBOL(errseq_sample);
 
 /**
- * errseq_check - has an error occurred since a particular sample point?
- * @eseq: pointer to errseq_t value to be checked
- * @since: previously-sampled errseq_t from which to check
+ * errseq_check() - Has an error occurred since a particular sample point?
+ * @eseq: Pointer to errseq_t value to be checked.
+ * @since: Previously-sampled errseq_t from which to check.
  *
- * Grab the value that eseq points to, and see if it has changed "since"
- * the given value was sampled. The "since" value is not advanced, so there
+ * Grab the value that eseq points to, and see if it has changed @since
+ * the given value was sampled. The @since value is not advanced, so there
  * is no need to mark the value as seen.
  *
- * Returns the latest error set in the errseq_t or 0 if it hasn't changed.
+ * Return: The latest error set in the errseq_t or 0 if it hasn't changed.
  */
 int errseq_check(errseq_t *eseq, errseq_t since)
 {
@@ -155,11 +157,11 @@ int errseq_check(errseq_t *eseq, errseq_t since)
 EXPORT_SYMBOL(errseq_check);
 
 /**
- * errseq_check_and_advance - check an errseq_t and advance to current value
- * @eseq: pointer to value being checked and reported
- * @since: pointer to previously-sampled errseq_t to check against and advance
+ * errseq_check_and_advance() - Check an errseq_t and advance to current value.
+ * @eseq: Pointer to value being checked and reported.
+ * @since: Pointer to previously-sampled errseq_t to check against and advance.
  *
- * Grab the eseq value, and see whether it matches the value that "since"
+ * Grab the eseq value, and see whether it matches the value that @since
  * points to. If it does, then just return 0.
  *
  * If it doesn't, then the value has changed. Set the "seen" flag, and try to
@@ -170,6 +172,9 @@ EXPORT_SYMBOL(errseq_check);
  * value. The caller must provide that if necessary. Because of this, callers
  * may want to do a lockless errseq_check before taking the lock and calling
  * this.
+ *
+ * Return: Negative errno if one has been stored, or 0 if no new error has
+ * occurred.
  */
 int errseq_check_and_advance(errseq_t *eseq, errseq_t *since)
 {
diff --git a/lib/uuid.c b/lib/uuid.c
index 680b9fb9ba09..2290b9f001a9 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -29,15 +29,14 @@ EXPORT_SYMBOL(uuid_null);
 const u8 guid_index[16] = {3,2,1,0,5,4,7,6,8,9,10,11,12,13,14,15};
 const u8 uuid_index[16] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
 
-/***************************************************************
+/**
+ * generate_random_uuid - generate a random UUID
+ * @uuid: where to put the generated UUID
+ *
  * Random UUID interface
  *
- * Used here for a Boot ID, but can be useful for other kernel
- * drivers.
- ***************************************************************/
-
-/*
- * Generate random UUID
+ * Used to create a Boot ID or a filesystem UUID/GUID, but can be
+ * useful for other kernel drivers.
  */
 void generate_random_uuid(unsigned char uuid[16])
 {
@@ -73,16 +72,17 @@ void uuid_gen(uuid_t *bu)
 EXPORT_SYMBOL_GPL(uuid_gen);
 
 /**
-  * uuid_is_valid - checks if UUID string valid
-  * @uuid:	UUID string to check
-  *
-  * Description:
-  * It checks if the UUID string is following the format:
-  *	xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
-  * where x is a hex digit.
-  *
-  * Return: true if input is valid UUID string.
-  */
+ * uuid_is_valid - checks if a UUID string is valid
+ * @uuid:	UUID string to check
+ *
+ * Description:
+ * It checks if the UUID string is following the format:
+ *	xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+ *
+ * where x is a hex digit.
+ *
+ * Return: true if input is valid UUID string.
+ */
 bool uuid_is_valid(const char *uuid)
 {
 	unsigned int i;
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 01c3957b2de6..2b18135446dc 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1834,7 +1834,8 @@ static char *ptr_to_id(char *buf, char *end, void *ptr, struct printf_spec spec)
  *
  * - 'x' For printing the address. Equivalent to "%lx".
  *
- * ** Please update also Documentation/printk-formats.txt when making changes **
+ * ** When making changes please also update:
+ *	Documentation/core-api/printk-formats.rst
  *
  * Note: The difference between 'S' and 'F' is that on ia64 and ppc64
  * function pointers are really function descriptors, which contain a
@@ -2194,7 +2195,7 @@ set_precision(struct printf_spec *spec, int prec)
  *  - ``%n`` is unsupported
  *  - ``%p*`` is handled by pointer()
  *
- * See pointer() or Documentation/printk-formats.txt for more
+ * See pointer() or Documentation/core-api/printk-formats.rst for more
  * extensive description.
  *
  * **Please update the documentation in both places when making changes**