linux-kernel - [PATCH v2 1/1] minmax: Deduplicate __unconst_integer

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Date:   Mon, 11 Sep 2023 18:49:13 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Herve Codina <herve.codina@...tlin.com>
Subject: [PATCH v2 1/1] minmax: Deduplicate __unconst_integer_typeof()

It appears that compiler_types.h already have an implementation
of the __unconst_integer_typeof() called __unqual_scalar_typeof().
Use it instead of the copy.

Acked-by: Herve Codina <herve.codina@...tlin.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v2: added tag (Herve), Cc'ed to Andrew as initial commit now in upstream
 include/linux/minmax.h | 26 +++-----------------------
 1 file changed, 3 insertions(+), 23 deletions(-)

diff --git a/include/linux/minmax.h b/include/linux/minmax.h
index 83aebc244cba..69bbe987fa87 100644
--- a/include/linux/minmax.h
+++ b/include/linux/minmax.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_MINMAX_H
 #define _LINUX_MINMAX_H
 
+#include <linux/compiler_types.h>
 #include <linux/const.h>
 #include <linux/types.h>
 
@@ -134,27 +135,6 @@
  */
 #define max_t(type, x, y)	__careful_cmp((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,
@@ -169,13 +149,13 @@
  * '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
+ * typeof() keeps the const qualifier. Use __unqual_scalar_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]; \
+	__unqual_scalar_typeof(__array[0]) __element = __array[--__len];\
 	while (__len--)							\
 		__element = op(__element, __array[__len]);		\
 	__element; })
-- 
2.40.0.1.gaa8946217a0b