Unexport asm/page.h

Do not export asm/page.h during make headers_install.  This removes PAGE_SIZE
from userspace headers.

Signed-off-by: Kirill A. Shutemov <k.shutemov@gmail.com>
Reviewed-by: David Woodhouse <dwmw2@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-s390/kexec.h b/include/asm-s390/kexec.h
index 7592af7..f219c64 100644
--- a/include/asm-s390/kexec.h
+++ b/include/asm-s390/kexec.h
@@ -10,7 +10,9 @@
 #ifndef _S390_KEXEC_H
 #define _S390_KEXEC_H
 
+#ifdef __KERNEL__
 #include <asm/page.h>
+#endif
 #include <asm/processor.h>
 /*
  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.