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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

Signed-off-by: Khem Raj <>
Cc: Philippe Ombredanne <>
Cc: Kate Stewart <>
Cc: Greg Kroah-Hartman <>
Cc: Thomas Gleixner <>
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 23cd84868cc3..acddbe50a20d 100644
--- a/include/uapi/linux/swab.h
+++ b/include/uapi/linux/swab.h
@@ -3,6 +3,7 @@

#include <linux/types.h>
+#include <linux/stddef.h>
#include <linux/compiler.h>
#include <asm/swab.h>

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