]> git.sesse.net Git - bcachefs-tools-debian/blobdiff - include/linux/math64.h
Move c_src dirs back to toplevel
[bcachefs-tools-debian] / include / linux / math64.h
diff --git a/include/linux/math64.h b/include/linux/math64.h
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+#ifndef _LINUX_MATH64_H
+#define _LINUX_MATH64_H
+
+#include <linux/types.h>
+
+#define do_div(n,base) ({                                      \
+       u32 __base = (base);                                    \
+       u32 __rem;                                              \
+       __rem = ((u64)(n)) % __base;                            \
+       (n) = ((u64)(n)) / __base;                              \
+       __rem;                                                  \
+ })
+
+#define div64_long(x, y) div64_s64((x), (y))
+#define div64_ul(x, y)   div64_u64((x), (y))
+
+/**
+ * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
+ *
+ * This is commonly provided by 32bit archs to provide an optimized 64bit
+ * divide.
+ */
+static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
+{
+       *remainder = dividend % divisor;
+       return dividend / divisor;
+}
+
+/**
+ * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
+ */
+static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
+{
+       *remainder = dividend % divisor;
+       return dividend / divisor;
+}
+
+/**
+ * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
+ */
+static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
+{
+       *remainder = dividend % divisor;
+       return dividend / divisor;
+}
+
+/**
+ * div64_u64 - unsigned 64bit divide with 64bit divisor
+ */
+static inline u64 div64_u64(u64 dividend, u64 divisor)
+{
+       return dividend / divisor;
+}
+
+/**
+ * div64_s64 - signed 64bit divide with 64bit divisor
+ */
+static inline s64 div64_s64(s64 dividend, s64 divisor)
+{
+       return dividend / divisor;
+}
+
+/**
+ * div_u64 - unsigned 64bit divide with 32bit divisor
+ *
+ * This is the most common 64bit divide and should be used if possible,
+ * as many 32bit archs can optimize this variant better than a full 64bit
+ * divide.
+ */
+static inline u64 div_u64(u64 dividend, u32 divisor)
+{
+       u32 remainder;
+       return div_u64_rem(dividend, divisor, &remainder);
+}
+
+/**
+ * div_s64 - signed 64bit divide with 32bit divisor
+ */
+static inline s64 div_s64(s64 dividend, s32 divisor)
+{
+       s32 remainder;
+       return div_s64_rem(dividend, divisor, &remainder);
+}
+
+#endif /* _LINUX_MATH64_H */