linux-kernel - [PATCH v1 1/3] array

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Message-ID: <0b3d2fde03a0b11643d5a9bb56d7a903c58320cf.1758806023.git.alx@kernel.org>
Date: Thu, 25 Sep 2025 15:20:37 +0200
From: Alejandro Colomar <alx@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Alejandro Colomar <alx@...nel.org>, Marco Elver <elver@...gle.com>, 
	Kees Cook <kees@...nel.org>, Christopher Bazley <chris.bazley.wg14@...il.com>, 
	Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Jann Horn <jannh@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>, Michal Hocko <mhocko@...e.com>, 
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH v1 1/3] array_size.h: Add ENDOF()

This macro is useful to calculate the second argument to
sprintf_trunc_end(), avoiding off-by-one bugs.

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>
Signed-off-by: Alejandro Colomar <alx@...nel.org>
Message-ID: <37b1088dbd01a21d2f9d460aa510726119b3bcb0.1752193588.git.alx@...nel.org>
---
 include/linux/array_size.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/array_size.h b/include/linux/array_size.h
index 06d7d83196ca..781bdb70d939 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))
 
+/**
+ * ENDOF - get a pointer to one past the last element in array @a
+ * @a: array
+ */
+#define ENDOF(a)  (a + ARRAY_SIZE(a))
+
 #endif  /* _LINUX_ARRAY_SIZE_H */
-- 
2.51.0