diff --git a/include/linux/byteorder.h b/include/linux/byteorder.h
index 35ef2289..7b04f5bc 100644
--- a/include/linux/byteorder.h
+++ b/include/linux/byteorder.h
@@ -1,6 +1,7 @@
 #ifndef __LINUX_BYTEORDER_H
 #define __LINUX_BYTEORDER_H
 
+#include <linux/compiler.h>
 #include <asm/byteorder.h>
 
 #define swab16 __swab16
diff --git a/include/linux/log2.h b/include/linux/log2.h
index 6fecd393..1f977d60 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -184,7 +184,7 @@ unsigned long __rounddown_pow_of_two(unsigned long n)
 	__rounddown_pow_of_two(n)		\
  )
 
-static inline __attribute_const__
+static inline __attribute__((const))
 int __get_order(unsigned long size)
 {
 	int order;
diff --git a/include/linux/stat.h b/include/linux/stat.h
index d5ded253..1a30957b 100644
--- a/include/linux/stat.h
+++ b/include/linux/stat.h
@@ -9,7 +9,4 @@
 #define S_IWUGO		(S_IWUSR|S_IWGRP|S_IWOTH)
 #define S_IXUGO		(S_IXUSR|S_IXGRP|S_IXOTH)
 
-#define UTIME_NOW	((1l << 30) - 1l)
-#define UTIME_OMIT	((1l << 30) - 2l)
-
 #endif
diff --git a/include/linux/types.h b/include/linux/types.h
index ddc8eca7..2c1e9a22 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -5,6 +5,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include <fcntl.h>
 #include <sys/types.h>
 
 #define __SANE_USERSPACE_TYPES__	/* For PPC64, to get LL64 types */
diff --git a/libbcachefs/bcachefs_format.h b/libbcachefs/bcachefs_format.h
index 85f728f2..854e1c3d 100644
--- a/libbcachefs/bcachefs_format.h
+++ b/libbcachefs/bcachefs_format.h
@@ -6,6 +6,7 @@
  */
 
 #include <asm/types.h>
+#include <linux/compiler.h>
 #include <asm/byteorder.h>
 #include <linux/uuid.h>
 
diff --git a/libbcachefs/siphash.c b/libbcachefs/siphash.c
index 3a6c9c82..d689a7b0 100644
--- a/libbcachefs/siphash.c
+++ b/libbcachefs/siphash.c
@@ -43,6 +43,7 @@
  * https://131002.net/siphash/
  */
 
+#include <linux/compiler.h>
 #include <asm/byteorder.h>
 #include <asm/unaligned.h>
 #include <linux/bitops.h>