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

From: Dmitry V. Levin
Date: Wed Feb 22 2017 - 18:17:21 EST

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@xxxxxxxxxxxx>
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. */
#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