From dc221138c809125dc1bbff8506c70cb7bd846368 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 12 Sep 2018 17:08:58 -0700
Subject: [PATCH] include linux/stddef.h in swab.h uapi header

swab.h uses __always_inline without including the header where it is
defined, this is exposed by musl based distributions where this macro is
not defined by system C library headers unlike glibc where it is defined
in sys/cdefs.h and that header gets pulled in indirectly via

features.h -> sys/cdefs.h

and features.h gets pulled in a lot of headers. Therefore it may work in
cases where features.h is includes but not otherwise.

Adding linux/stddef.h here ensures that __always_inline is always
defined independent of which C library is used in userspace

Upstream-Status: Submitted [https://lkml.org/lkml/2018/9/13/78]

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>

---
 include/uapi/linux/swab.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/swab.h b/include/uapi/linux/swab.h
index 7272f85d6..2912fe463 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -3,6 +3,7 @@
 #define _UAPI_LINUX_SWAB_H
 
 #include <linux/types.h>
+#include <linux/stddef.h>
 #include <linux/compiler.h>
 #include <asm/bitsperlong.h>
 #include <asm/swab.h>