Changeset 660 for GPL/branches/uniaud32-next/include/linux/log2.h

Timestamp:

Jan 25, 2021, 11:33:33 PM (5 years ago)

Author:

Paul Smedley

Message:

More code cleanups

File:

• GPL/branches/uniaud32-next/include/linux/log2.h (modified) (2 diffs)

GPL/branches/uniaud32-next/include/linux/log2.h

@@ -14 +14 @@
 {
         return (n != 0 && ((n & (n - 1)) == 0));
+}
+
+/**
+ * __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)
+{
+        return 1UL << fls_long(n - 1);
+}
+
+/**
+ * __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)
+{
+        return 1UL << (fls_long(n) - 1);
 }
 
@@ -62 +82 @@
 }
 
+/**
+ * roundup_pow_of_two - round the given value up to nearest power of two
+ * @n: parameter
+ *
+ * round the given value up to the nearest power of two
+ * - the result is undefined when n == 0
+ * - this can be used to initialise global variables from constant data
+ */
+#define roundup_pow_of_two(n)                   \
+(                                               \
+        __roundup_pow_of_two(n)                 \
+ )
+
+/**
+ * rounddown_pow_of_two - round the given value down to nearest power of two
+ * @n: parameter
+ *
+ * round the given value down to the nearest power of two
+ * - the result is undefined when n == 0
+ * - this can be used to initialise global variables from constant data
+ */
+#define rounddown_pow_of_two(n)                 \
+(                                               \
+        __rounddown_pow_of_two(n)               \
+ )
+
 #endif /* _LINUX_LOG2_H */