This is a note to let you know that I've just added the patch titled
minmax: Introduce {min,max}_array()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
minmax-introduce-min-max-_array.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <sta...@vger.kernel.org> know about it.
>From prvs=3555e8f33=farb...@amazon.com Wed Sep 24 22:25:22 2025
From: Eliav Farber <farb...@amazon.com>
Date: Wed, 24 Sep 2025 20:23:03 +0000
Subject: minmax: Introduce {min,max}_array()
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Cc: Andy Shevchenko <andy.shevche...@gmail.com>, Christophe Leroy
<christophe.le...@csgroup.eu>
Message-ID: <20250924202320.32333-3-farb...@amazon.com>
From: Herve Codina <herve.cod...@bootlin.com>
[ Upstream commit c952c748c7a983a8bda9112984e6f2c1f6e441a5 ]
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.cod...@bootlin.com>
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
Reviewed-by: Christophe Leroy <christophe.le...@csgroup.eu>
Link: https://lore.kernel.org/r/20230623085830.749991-8-herve.cod...@bootlin.com
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Eliav Farber <farb...@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
include/linux/minmax.h | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -168,6 +168,70 @@
*/
#define max_t(type, x, y) __careful_cmp(max, (type)(x), (type)(y))
+/*
+ * Remove a const qualifier from integer types
+ * _Generic(foo, type-name: association, ..., default: association) performs a
+ * comparison against the foo type (not the qualified type).
+ * Do not use the const keyword in the type-name as it will not match the
+ * unqualified type of foo.
+ */
+#define __unconst_integer_type_cases(type) \
+ unsigned type: (unsigned type)0, \
+ signed type: (signed type)0
+
+#define __unconst_integer_typeof(x) typeof( \
+ _Generic((x), \
+ char: (char)0, \
+ __unconst_integer_type_cases(char), \
+ __unconst_integer_type_cases(short), \
+ __unconst_integer_type_cases(int), \
+ __unconst_integer_type_cases(long), \
+ __unconst_integer_type_cases(long long), \
+ default: (x)))
+
+/*
+ * 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< ---
+ *
+ * The first typeof(&(array)[0]) is needed in order to support arrays of both
+ * 'int *buff' and 'int buff[N]' types.
+ *
+ * The array can be an array of const items.
+ * typeof() keeps the const qualifier. Use __unconst_integer_typeof() in order
+ * to discard the const qualifier for the __element variable.
+ */
+#define __minmax_array(op, array, len) ({ \
+ typeof(&(array)[0]) __array = (array); \
+ typeof(len) __len = (len); \
+ __unconst_integer_typeof(__array[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
Patches currently in stable-queue which might be from farb...@amazon.com are
queue-6.1/minmax-fix-indentation-of-__cmp_once-and-__clamp_once.patch
queue-6.1/minmax-add-in_range-macro.patch
queue-6.1/minmax-deduplicate-__unconst_integer_typeof.patch
queue-6.1/minmax-introduce-min-max-_array.patch
