linux-kernel - [PATCH] uapi: fix linux/sysctl.h userspace compilation errors

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Date:   Thu, 23 Feb 2017 02:06:52 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] uapi: fix linux/sysctl.h userspace compilation errors

Include <stddef.h> (guarded by #ifndef __KERNEL__) to fix the following
linux/sysctl.h userspace compilation errors:

/usr/include/linux/sysctl.h:38:2: error: unknown type name 'size_t'
  size_t *oldlenp;
/usr/include/linux/sysctl.h:40:2: error: unknown type name 'size_t'
  size_t newlen;

This also fixes userspace compilation of uapi headers that include
linux/sysctl.h, e.g. linux/netfilter.h.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
---
 include/uapi/linux/sysctl.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
index d2b1215..c6d18aa 100644
--- a/include/uapi/linux/sysctl.h
+++ b/include/uapi/linux/sysctl.h
@@ -26,6 +26,10 @@
 #include <linux/types.h>
 #include <linux/compiler.h>
 
+#ifndef __KERNEL__
+#include <stddef.h>		/* For size_t. */
+#endif
+
 #define CTL_MAXNAME 10		/* how many path components do we allow in a
 				   call to sysctl?   In other words, what is
 				   the largest acceptable value for the nlen
-- 
ldv