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-rw-r--r--include/asm-generic/div64.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/asm-generic/div64.h b/include/asm-generic/div64.h
index 163f77999ea4..3de84f64423f 100644
--- a/include/asm-generic/div64.h
+++ b/include/asm-generic/div64.h
@@ -25,6 +25,20 @@
#if BITS_PER_LONG == 64
+/**
+ * do_div - returns 2 values: calculate remainder and update new dividend
+ * @n: pointer to uint64_t dividend (will be updated)
+ * @base: uint32_t divisor
+ *
+ * Summary:
+ * ``uint32_t remainder = *n % base;``
+ * ``*n = *n / base;``
+ *
+ * Return: (uint32_t)remainder
+ *
+ * NOTE: macro parameter @n is evaluated multiple times,
+ * beware of side effects!
+ */
# define do_div(n,base) ({ \
uint32_t __base = (base); \
uint32_t __rem; \