mm/mmu_notifier: clean up mmu_notifier.h kernel-doc

Eliminate kernel-doc warnings in mmu_notifier.h:
- add a missing struct short description
- use the correct format for function parameters
- add missing function return comment sections

Warning: include/linux/mmu_notifier.h:236 missing initial short
 description on line: * struct mmu_interval_notifier_ops
Warning: include/linux/mmu_notifier.h:325 function parameter 'interval_sub'
 not described in 'mmu_interval_set_seq'
Warning: include/linux/mmu_notifier.h:325 function parameter 'cur_seq'
 not described in 'mmu_interval_set_seq'
Warning: include/linux/mmu_notifier.h:346 function parameter 'interval_sub'
 not described in 'mmu_interval_read_retry'
Warning: include/linux/mmu_notifier.h:346 function parameter 'seq' not
 described in 'mmu_interval_read_retry'
Warning: include/linux/mmu_notifier.h:346 No description found for return
 value of 'mmu_interval_read_retry'
Warning: include/linux/mmu_notifier.h:370 function parameter 'interval_sub'
 not described in 'mmu_interval_check_retry'
Warning: include/linux/mmu_notifier.h:370 function parameter 'seq' not
 described in 'mmu_interval_check_retry'
Warning: include/linux/mmu_notifier.h:370 No description found for return
 value of 'mmu_interval_check_retry'

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Randy Dunlap <[email protected]>
Reviewed-by: Jason Gunthorpe <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: "Liam R. Howlett" <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: rddunlap

include/linux/mmu_notifier.h

@@ -234,7 +234,7 @@ struct mmu_notifier {
 };
 
 /**
- * struct mmu_interval_notifier_ops
+ * struct mmu_interval_notifier_ops - callback for range notification
  * @invalidate: Upon return the caller must stop using any SPTEs within this
  *              range. This function can sleep. Return false only if sleeping
  *              was required but mmu_notifier_range_blockable(range) is false.
@@ -309,8 +309,8 @@ void mmu_interval_notifier_remove(struct mmu_interval_notifier *interval_sub);
 
 /**
  * mmu_interval_set_seq - Save the invalidation sequence
- * @interval_sub - The subscription passed to invalidate
- * @cur_seq - The cur_seq passed to the invalidate() callback
+ * @interval_sub: The subscription passed to invalidate
+ * @cur_seq: The cur_seq passed to the invalidate() callback
  *
  * This must be called unconditionally from the invalidate callback of a
  * struct mmu_interval_notifier_ops under the same lock that is used to call
@@ -329,16 +329,16 @@ mmu_interval_set_seq(struct mmu_interval_notifier *interval_sub,
 
 /**
  * mmu_interval_read_retry - End a read side critical section against a VA range
- * interval_sub: The subscription
- * seq: The return of the paired mmu_interval_read_begin()
+ * @interval_sub: The subscription
+ * @seq: The return of the paired mmu_interval_read_begin()
  *
  * This MUST be called under a user provided lock that is also held
  * unconditionally by op->invalidate() when it calls mmu_interval_set_seq().
  *
  * Each call should be paired with a single mmu_interval_read_begin() and
  * should be used to conclude the read side.
  *
- * Returns true if an invalidation collided with this critical section, and
+ * Returns: true if an invalidation collided with this critical section, and
  * the caller should retry.
  */
 static inline bool
@@ -350,20 +350,21 @@ mmu_interval_read_retry(struct mmu_interval_notifier *interval_sub,
 
 /**
  * mmu_interval_check_retry - Test if a collision has occurred
- * interval_sub: The subscription
- * seq: The return of the matching mmu_interval_read_begin()
+ * @interval_sub: The subscription
+ * @seq: The return of the matching mmu_interval_read_begin()
  *
  * This can be used in the critical section between mmu_interval_read_begin()
- * and mmu_interval_read_retry().  A return of true indicates an invalidation
- * has collided with this critical region and a future
- * mmu_interval_read_retry() will return true.
- *
- * False is not reliable and only suggests a collision may not have
- * occurred. It can be called many times and does not have to hold the user
- * provided lock.
+ * and mmu_interval_read_retry().
  *
  * This call can be used as part of loops and other expensive operations to
  * expedite a retry.
+ * It can be called many times and does not have to hold the user
+ * provided lock.
+ *
+ * Returns: true indicates an invalidation has collided with this critical
+ * region and a future mmu_interval_read_retry() will return true.
+ * False is not reliable and only suggests a collision may not have
+ * occurred.
  */
 static inline bool
 mmu_interval_check_retry(struct mmu_interval_notifier *interval_sub,