Introduce min_array() (resp max_array()) in order to get the
minimal (resp maximum) of values present in an array.
Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>
---
include/linux/minmax.h | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index 396df1121bff..2cd0d34ce921 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -133,6 +133,42 @@
*/
#define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
+/*
+ * Do not check the array parameter using __must_be_array().
+ * In the following legit use-case where the "array" passed is a simple pointer,
+ * __must_be_array() will return a failure.
+ * --- 8< ---
+ * int *buff
+ * ...
+ * min = min_array(buff, nb_items);
+ * --- 8< ---
+ */
+#define __minmax_array(op, array, len) ({ \
+ typeof(array) __array = (array); \
+ typeof(len) __len = (len); \
+ typeof(__array[0] + 0) __element = __array[--__len]; \
+ while (__len--) \
+ __element = op(__element, __array[__len]); \
+ __element; })
+
+/**
+ * min_array - return minimum of values present in an array
+ * @array: array
+ * @len: array length
+ *
+ * Note that @len must not be zero (empty array).
+ */
+#define min_array(array, len) __minmax_array(min, array, len)
+
+/**
+ * max_array - return maximum of values present in an array
+ * @array: array
+ * @len: array length
+ *
+ * Note that @len must not be zero (empty array).
+ */
+#define max_array(array, len) __minmax_array(max, array, len)
+
/**
* clamp_t - return a value clamped to a given range using a given type
* @type: the type of variable to use
--
2.40.1
