diff --git a/libc/include/bits/glibc-syscalls.h b/libc/include/bits/glibc-syscalls.h
index c144919..79f7da0 100644
--- a/libc/include/bits/glibc-syscalls.h
+++ b/libc/include/bits/glibc-syscalls.h
@@ -906,6 +906,9 @@
 #if defined(__NR_restart_syscall)
   #define SYS_restart_syscall __NR_restart_syscall
 #endif
+#if defined(__NR_riscv_flush_icache)
+  #define SYS_riscv_flush_icache __NR_riscv_flush_icache
+#endif
 #if defined(__NR_rmdir)
   #define SYS_rmdir __NR_rmdir
 #endif
diff --git a/libc/include/netinet/ether.h b/libc/include/netinet/ether.h
index 480063d..d570c18 100644
--- a/libc/include/netinet/ether.h
+++ b/libc/include/netinet/ether.h
@@ -44,7 +44,7 @@
  *
  * Returns a pointer to a static buffer.
  */
-char* ether_ntoa(const struct ether_addr* __addr);
+char* _Nonnull ether_ntoa(const struct ether_addr* _Nonnull __addr);
 
 /**
  * [ether_ntoa_r(3)](http://man7.org/linux/man-pages/man3/ether_ntoa_r.3.html) returns a string
@@ -52,7 +52,7 @@
  *
  * Returns a pointer to the given buffer.
  */
-char* ether_ntoa_r(const struct ether_addr* __addr, char* __buf);
+char* _Nonnull ether_ntoa_r(const struct ether_addr* _Nonnull __addr, char* _Nonnull __buf);
 
 /**
  * [ether_aton(3)](http://man7.org/linux/man-pages/man3/ether_aton.3.html) returns an `ether_addr`
@@ -60,7 +60,7 @@
  *
  * Returns a pointer to a static buffer, or NULL if the given string isn't a valid MAC address.
  */
-struct ether_addr* ether_aton(const char* __ascii);
+struct ether_addr* _Nullable ether_aton(const char* _Nonnull __ascii);
 
 /**
  * [ether_aton_r(3)](http://man7.org/linux/man-pages/man3/ether_aton_r.3.html) returns an
@@ -68,6 +68,6 @@
  *
  * Returns a pointer to the given buffer, or NULL if the given string isn't a valid MAC address.
  */
-struct ether_addr* ether_aton_r(const char* __ascii, struct ether_addr* __addr);
+struct ether_addr* _Nullable ether_aton_r(const char* _Nonnull __ascii, struct ether_addr* _Nonnull __addr);
 
 __END_DECLS
diff --git a/libc/include/netinet/in.h b/libc/include/netinet/in.h
index 46e3543..b235e6e 100644
--- a/libc/include/netinet/in.h
+++ b/libc/include/netinet/in.h
@@ -54,7 +54,7 @@
 
 typedef uint16_t in_port_t;
 
-int bindresvport(int __fd, struct sockaddr_in* __sin);
+int bindresvport(int __fd, struct sockaddr_in* _Nullable __sin);
 
 #if __ANDROID_API__ >= 24
 extern const struct in6_addr in6addr_any __INTRODUCED_IN(24);
diff --git a/libc/kernel/tools/update_all.py b/libc/kernel/tools/update_all.py
index abc72a4..ae89a80 100755
--- a/libc/kernel/tools/update_all.py
+++ b/libc/kernel/tools/update_all.py
@@ -92,6 +92,7 @@
                      'kernel/uapi/asm-arm/asm/unistd.h',
                      'kernel/uapi/asm-arm/asm/unistd-eabi.h',
                      'kernel/uapi/asm-arm/asm/unistd-oabi.h',
+                     'kernel/uapi/asm-riscv/asm/unistd.h',
                      'kernel/uapi/asm-x86/asm/unistd_32.h',
                      'kernel/uapi/asm-x86/asm/unistd_64.h',
                      'kernel/uapi/asm-x86/asm/unistd_x32.h']: