netdev - [PATCH v2 1/3] uapi: add INT_MAX and INT

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Message-Id: <20260113-uapi-limits-v2-1-93c20f4b2c1a@linutronix.de>
Date: Tue, 13 Jan 2026 08:44:17 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 Andrew Lunn <andrew@...n.ch>, Pablo Neira Ayuso <pablo@...filter.org>, 
 Jozsef Kadlecsik <kadlec@...filter.org>, Florian Westphal <fw@...len.de>, 
 Phil Sutter <phil@....cc>
Cc: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, 
 netdev@...r.kernel.org, netfilter-devel@...r.kernel.org, 
 coreteam@...filter.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 1/3] uapi: add INT_MAX and INT_MIN constants

Some UAPI headers use INT_MAX and INT_MIN. Currently they include
<limits.h> for their definitions, which introduces a problematic
dependency on libc.

Add custom, namespaced definitions of INT_MAX and INT_MIN using the
same values as the regular kernel code.
These definitions are not added to uapi/linux/limits.h, as that header
will conflict with libc definitions on some platforms.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 include/uapi/linux/typelimits.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/typelimits.h b/include/uapi/linux/typelimits.h
new file mode 100644
index 000000000000..8166c639b518
--- /dev/null
+++ b/include/uapi/linux/typelimits.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_LINUX_TYPELIMITS_H
+#define _UAPI_LINUX_TYPELIMITS_H
+
+#define __KERNEL_INT_MAX ((int)(~0U >> 1))
+#define __KERNEL_INT_MIN (-__KERNEL_INT_MAX - 1)
+
+#endif /* _UAPI_LINUX_TYPELIMITS_H */

-- 
2.52.0