linux-kernel - [PATCH v4 1/4] array_size.h: Add ARRAY

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Message-ID: <9f87d6208a6c754ed0e322cc51a92e0ed6e59123.1762717358.git.alx@kernel.org>
Date: Sun, 9 Nov 2025 20:45:09 +0100
From: Alejandro Colomar <alx@...nel.org>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: Alejandro Colomar <alx@...nel.org>, Kees Cook <kees@...nel.org>, 
	Christopher Bazley <chris.bazley.wg14@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	Marco Elver <elver@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Jann Horn <jannh@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, "Maciej W. Rozycki" <macro@...am.me.uk>
Subject: [PATCH v4 1/4] array_size.h: Add ARRAY_END()

ARRAY_END() returns a pointer one past the end of the last element in
the array argument.  This pointer is useful for iterating over the
elements of an array:

	for (T *p = a, p < ARRAY_END(a); p++)
		...

Cc: Kees Cook <kees@...nel.org>
Cc: Christopher Bazley <chris.bazley.wg14@...il.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Marco Elver <elver@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: "Maciej W. Rozycki" <macro@...am.me.uk>
Signed-off-by: Alejandro Colomar <alx@...nel.org>
Message-ID: <37b1088dbd01a21d2f9d460aa510726119b3bcb0.1752193588.git.alx@...nel.org>
---
 drivers/block/floppy.c     | 2 --
 include/linux/array_size.h | 6 ++++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 5336c3c5ca36..69661840397e 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4802,8 +4802,6 @@ static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
 	}
 }
 
-#define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
-
 static int floppy_request_regions(int fdc)
 {
 	const struct io_region *p;
diff --git a/include/linux/array_size.h b/include/linux/array_size.h
index 06d7d83196ca..0c4fec98822e 100644
--- a/include/linux/array_size.h
+++ b/include/linux/array_size.h
@@ -10,4 +10,10 @@
  */
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 
+/**
+ * ARRAY_END - get a pointer to one past the last element in array @arr
+ * @arr: array
+ */
+#define ARRAY_END(arr)  (&(arr)[ARRAY_SIZE(arr)])
+
 #endif  /* _LINUX_ARRAY_SIZE_H */
-- 
2.51.0