diff --git a/libc/include/sys/eventfd.h b/libc/include/sys/eventfd.h
index b9d3fe9..3000737 100644
--- a/libc/include/sys/eventfd.h
+++ b/libc/include/sys/eventfd.h
@@ -35,15 +35,19 @@
 
 #include <sys/cdefs.h>
 #include <fcntl.h>
+#include <linux/eventfd.h>
 
 __BEGIN_DECLS
 
-/** The eventfd() flag to provide semaphore-like semantics for reads. */
-#define EFD_SEMAPHORE (1 << 0)
-/** The eventfd() flag for a close-on-exec file descriptor. */
-#define EFD_CLOEXEC O_CLOEXEC
-/** The eventfd() flag for a non-blocking file descriptor. */
-#define EFD_NONBLOCK O_NONBLOCK
+/*! \macro EFD_SEMAPHORE
+ * The eventfd() flag to provide semaphore-like semantics for reads.
+ */
+/*! \macro EFD_CLOEXEC
+ * The eventfd() flag for a close-on-exec file descriptor.
+ */
+/*! \macro EFD_NONBLOCK
+ * The eventfd() flag for a non-blocking file descriptor.
+ */
 
 /**
  * [eventfd(2)](https://man7.org/linux/man-pages/man2/eventfd.2.html) creates a file descriptor
diff --git a/libc/include/sys/inotify.h b/libc/include/sys/inotify.h
index f070857..75ed542 100644
--- a/libc/include/sys/inotify.h
+++ b/libc/include/sys/inotify.h
@@ -33,13 +33,9 @@
 #include <sys/types.h>
 #include <stdint.h>
 #include <linux/inotify.h>
-#include <asm/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK. */
 
 __BEGIN_DECLS
 
-#define IN_CLOEXEC O_CLOEXEC
-#define IN_NONBLOCK O_NONBLOCK
-
 int inotify_init(void);
 int inotify_init1(int __flags);
 int inotify_add_watch(int __fd, const char* _Nonnull __path, uint32_t __mask);
diff --git a/libc/include/sys/vfs.h b/libc/include/sys/vfs.h
index 3579799..1a640ba 100644
--- a/libc/include/sys/vfs.h
+++ b/libc/include/sys/vfs.h
@@ -40,6 +40,8 @@
 typedef __fsid_t fsid_t;
 
 #if defined(__LP64__)
+/* We can't just use the kernel struct statfs directly here because
+ * it's reused for both struct statfs *and* struct statfs64. */
 #define __STATFS64_BODY \
   uint64_t f_type; \
   uint64_t f_bsize; \