docs/core-api/mm: fix user memory accessors formatting

The descriptions of userspace memory access functions had minor issues
with formatting that made kernel-doc unable to properly detect the
function/macro names and the return value sections:

./arch/x86/include/asm/uaccess.h:80: info: Scanning doc for
./arch/x86/include/asm/uaccess.h:139: info: Scanning doc for
./arch/x86/include/asm/uaccess.h:231: info: Scanning doc for
./arch/x86/include/asm/uaccess.h:505: info: Scanning doc for
./arch/x86/include/asm/uaccess.h:530: info: Scanning doc for
./arch/x86/lib/usercopy_32.c:58: info: Scanning doc for
./arch/x86/lib/usercopy_32.c:69: warning: No description found for return
value of 'clear_user'
./arch/x86/lib/usercopy_32.c:78: info: Scanning doc for
./arch/x86/lib/usercopy_32.c:90: warning: No description found for return
value of '__clear_user'

Fix the formatting.

Link: http://lkml.kernel.org/r/1549549644-4903-3-git-send-email-rppt@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/include/asm/uaccess.h

@@ -75,7 +75,7 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
 #endif
 
 /**
- * access_ok: - Checks if a user space pointer is valid
+ * access_ok - Checks if a user space pointer is valid
  * @addr: User space pointer to start of block to check
  * @size: Size of block to check
  *
@@ -84,12 +84,12 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
  *
  * Checks if a pointer to a block of memory in user space is valid.
  *
- * Returns true (nonzero) if the memory block may be valid, false (zero)
- * if it is definitely invalid.
- *
  * Note that, depending on architecture, this function probably just
  * checks that the pointer is in the user space range - after calling
  * this function, memory access functions may still return -EFAULT.
+ *
+ * Return: true (nonzero) if the memory block may be valid, false (zero)
+ * if it is definitely invalid.
  */
 #define access_ok(addr, size)					\
 ({									\
@@ -134,7 +134,7 @@ extern int __get_user_bad(void);
 __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
 
 /**
- * get_user: - Get a simple variable from user space.
+ * get_user - Get a simple variable from user space.
  * @x:   Variable to store result.
  * @ptr: Source address, in user space.
  *
@@ -148,7 +148,7 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
  * @ptr must have pointer-to-simple-variable type, and the result of
  * dereferencing @ptr must be assignable to @x without a cast.
  *
- * Returns zero on success, or -EFAULT on error.
+ * Return: zero on success, or -EFAULT on error.
  * On error, the variable @x is set to zero.
  */
 /*
@@ -226,7 +226,7 @@ extern void __put_user_4(void);
 extern void __put_user_8(void);
 
 /**
- * put_user: - Write a simple value into user space.
+ * put_user - Write a simple value into user space.
  * @x:   Value to copy to user space.
  * @ptr: Destination address, in user space.
  *
@@ -240,7 +240,7 @@ extern void __put_user_8(void);
  * @ptr must have pointer-to-simple-variable type, and @x must be assignable
  * to the result of dereferencing @ptr.
  *
- * Returns zero on success, or -EFAULT on error.
+ * Return: zero on success, or -EFAULT on error.
  */
 #define put_user(x, ptr)					\
 ({								\
@@ -502,7 +502,7 @@ struct __large_struct { unsigned long buf[100]; };
 } while (0)
 
 /**
- * __get_user: - Get a simple variable from user space, with less checking.
+ * __get_user - Get a simple variable from user space, with less checking.
  * @x:   Variable to store result.
  * @ptr: Source address, in user space.
  *
@@ -519,7 +519,7 @@ struct __large_struct { unsigned long buf[100]; };
  * Caller must check the pointer with access_ok() before calling this
  * function.
  *
- * Returns zero on success, or -EFAULT on error.
+ * Return: zero on success, or -EFAULT on error.
  * On error, the variable @x is set to zero.
  */
 
@@ -527,7 +527,7 @@ struct __large_struct { unsigned long buf[100]; };
 	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
 
 /**
- * __put_user: - Write a simple value into user space, with less checking.
+ * __put_user - Write a simple value into user space, with less checking.
  * @x:   Value to copy to user space.
  * @ptr: Destination address, in user space.
  *
@@ -544,7 +544,7 @@ struct __large_struct { unsigned long buf[100]; };
  * Caller must check the pointer with access_ok() before calling this
  * function.
  *
- * Returns zero on success, or -EFAULT on error.
+ * Return: zero on success, or -EFAULT on error.
  */
 
 #define __put_user(x, ptr)						\

arch/x86/lib/usercopy_32.c

@@ -54,13 +54,13 @@ do {									\
 } while (0)
 
 /**
- * clear_user: - Zero a block of memory in user space.
+ * clear_user - Zero a block of memory in user space.
  * @to:   Destination address, in user space.
  * @n:    Number of bytes to zero.
  *
  * Zero a block of memory in user space.
  *
- * Returns number of bytes that could not be cleared.
+ * Return: number of bytes that could not be cleared.
  * On success, this will be zero.
  */
 unsigned long
@@ -74,14 +74,14 @@ clear_user(void __user *to, unsigned long n)
 EXPORT_SYMBOL(clear_user);
 
 /**
- * __clear_user: - Zero a block of memory in user space, with less checking.
+ * __clear_user - Zero a block of memory in user space, with less checking.
  * @to:   Destination address, in user space.
  * @n:    Number of bytes to zero.
  *
  * Zero a block of memory in user space.  Caller must check
  * the specified block with access_ok() before calling this function.
  *
- * Returns number of bytes that could not be cleared.
+ * Return: number of bytes that could not be cleared.
  * On success, this will be zero.
  */
 unsigned long