diff --git a/libc/kernel/uapi/asm-x86/asm/mtrr.h b/libc/kernel/uapi/asm-x86/asm/mtrr.h
index c709a70..9d596ba 100644
--- a/libc/kernel/uapi/asm-x86/asm/mtrr.h
+++ b/libc/kernel/uapi/asm-x86/asm/mtrr.h
@@ -57,13 +57,6 @@
 typedef __u8 mtrr_type;
 #define MTRR_NUM_FIXED_RANGES 88
 #define MTRR_MAX_VAR_RANGES 256
-struct mtrr_state_type {
-  struct mtrr_var_range var_ranges[MTRR_MAX_VAR_RANGES];
-  mtrr_type fixed_ranges[MTRR_NUM_FIXED_RANGES];
-  unsigned char enabled;
-  unsigned char have_fixed;
-  mtrr_type def_type;
-};
 #define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg))
 #define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1)
 #define MTRRIOC_ADD_ENTRY _IOW(MTRR_IOCTL_BASE, 0, struct mtrr_sentry)
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_32.h b/libc/kernel/uapi/asm-x86/asm/unistd_32.h
index 8e57516..f9d8dbd 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_32.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_32.h
@@ -458,4 +458,5 @@
 #define __NR_process_mrelease 448
 #define __NR_futex_waitv 449
 #define __NR_set_mempolicy_home_node 450
+#define __NR_cachestat 451
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_64.h b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
index 54ff16f..34a9ecc 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_64.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_64.h
@@ -380,4 +380,5 @@
 #define __NR_process_mrelease 448
 #define __NR_futex_waitv 449
 #define __NR_set_mempolicy_home_node 450
+#define __NR_cachestat 451
 #endif
diff --git a/libc/kernel/uapi/asm-x86/asm/unistd_x32.h b/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
index 1e05d75..de6c857 100644
--- a/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
+++ b/libc/kernel/uapi/asm-x86/asm/unistd_x32.h
@@ -333,6 +333,7 @@
 #define __NR_process_mrelease (__X32_SYSCALL_BIT + 448)
 #define __NR_futex_waitv (__X32_SYSCALL_BIT + 449)
 #define __NR_set_mempolicy_home_node (__X32_SYSCALL_BIT + 450)
+#define __NR_cachestat (__X32_SYSCALL_BIT + 451)
 #define __NR_rt_sigaction (__X32_SYSCALL_BIT + 512)
 #define __NR_rt_sigreturn (__X32_SYSCALL_BIT + 513)
 #define __NR_ioctl (__X32_SYSCALL_BIT + 514)