iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

linux/log2.h: fix kernel-doc notation

Browse Source 
Fix <linux/log2.h> kernel-doc:
- Add kernel-doc notation to some functions.
- Fix kernel-doc notation in function parameters.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Randy Dunlap 2017-09-30 08:43:38 -07:00 committed by Jonathan Corbet
parent 13277782dd
commit a1c4d24e02
1 changed files with 23 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
include/linux/log2.h
View File

@ -37,19 +37,23 @@ int __ilog2_u64(u64 n)
}
#endif
/*
* Determine whether some value is a power of two, where zero is
/**
* is_power_of_2() - check if a value is a power of two
* @n: the value to check
*
* Determine whether some value is a power of two, where zero is
* *not* considered a power of two.
* Return: true if @n is a power of 2, otherwise false.
*/
static inline __attribute__((const))
bool is_power_of_2(unsigned long n)
{
return (n != 0 && ((n & (n - 1)) == 0));
}
/*
* round up to nearest power of two
/**
* __roundup_pow_of_two() - round up to nearest power of two
* @n: value to round up
*/
static inline __attribute__((const))
unsigned long __roundup_pow_of_two(unsigned long n)
@ -57,8 +61,9 @@ unsigned long __roundup_pow_of_two(unsigned long n)
return 1UL << fls_long(n - 1);
}
/*
* round down to nearest power of two
/**
* __rounddown_pow_of_two() - round down to nearest power of two
* @n: value to round down
*/
static inline __attribute__((const))
unsigned long __rounddown_pow_of_two(unsigned long n)
@ -67,12 +72,12 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
}
/**
* ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value
* @n - parameter
* ilog2 - log base 2 of 32-bit or a 64-bit unsigned value
* @n: parameter
*
* constant-capable log of base 2 calculation
* - this can be used to initialise global variables from constant data, hence
* the massive ternary operator construction
* the massive ternary operator construction
*
* selects the appropriately-sized optimised version depending on sizeof(n)
*/
@ -150,7 +155,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
/**
* roundup_pow_of_two - round the given value up to nearest power of two
* @n - parameter
* @n: parameter
*
* round the given value up to the nearest power of two
* - the result is undefined when n == 0
@ -167,7 +172,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
/**
* rounddown_pow_of_two - round the given value down to nearest power of two
* @n - parameter
* @n: parameter
*
* round the given value down to the nearest power of two
* - the result is undefined when n == 0
@ -180,6 +185,12 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
__rounddown_pow_of_two(n) \
)
static inline __attribute_const__
int __order_base_2(unsigned long n)
{
return n > 1 ? ilog2(n - 1) + 1 : 0;
}
/**
* order_base_2 - calculate the (rounded up) base 2 order of the argument
* @n: parameter
@ -193,13 +204,6 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
* ob2(5) = 3
* ... and so on.
*/
static inline __attribute_const__
int __order_base_2(unsigned long n)
{
return n > 1 ? ilog2(n - 1) + 1 : 0;
}
#define order_base_2(n) \
( \
__builtin_constant_p(n) ? ( \