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-rw-r--r--misc/sys/cdefs.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 7fd41549db..a3c2429b32 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -304,8 +304,13 @@
 
 /* Forces a function to be always inlined.  */
 #if __GNUC_PREREQ (3,2)
+/* The Linux kernel defines __always_inline in stddef.h (283d7573), and
+   it conflicts with this definition.  Therefore undefine it first to
+   allow either header to be included first.  */
+# undef __always_inline
 # define __always_inline __inline __attribute__ ((__always_inline__))
 #else
+# undef __always_inline
 # define __always_inline __inline
 #endif