diff --git a/linux-user/aarch64/target_syscall.h b/linux-user/aarch64/target_syscall.h
index 995e475..3194e6b 100644
--- a/linux-user/aarch64/target_syscall.h
+++ b/linux-user/aarch64/target_syscall.h
@@ -16,8 +16,9 @@
 #define UNAME_MINIMUM_RELEASE "3.8.0"
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ       2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define TARGET_PR_SVE_SET_VL  50
 #define TARGET_PR_SVE_GET_VL  51
diff --git a/linux-user/alpha/target_syscall.h b/linux-user/alpha/target_syscall.h
index 3426cc5..fd38942 100644
--- a/linux-user/alpha/target_syscall.h
+++ b/linux-user/alpha/target_syscall.h
@@ -258,7 +258,8 @@
 #define TARGET_UAC_NOFIX		2
 #define TARGET_UAC_SIGBUS		4
 #define TARGET_MINSIGSTKSZ              4096
-#define TARGET_MLOCKALL_MCL_CURRENT     0x2000
-#define TARGET_MLOCKALL_MCL_FUTURE      0x4000
+#define TARGET_MCL_CURRENT     0x2000
+#define TARGET_MCL_FUTURE      0x4000
+#define TARGET_MCL_ONFAULT     0x8000
 
 #endif /* ALPHA_TARGET_SYSCALL_H */
diff --git a/linux-user/arm/target_syscall.h b/linux-user/arm/target_syscall.h
index f85cbda..e870ed7 100644
--- a/linux-user/arm/target_syscall.h
+++ b/linux-user/arm/target_syscall.h
@@ -28,8 +28,10 @@
 #define TARGET_CLONE_BACKWARDS
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
+
 #define TARGET_WANT_OLD_SYS_SELECT
 
 #define TARGET_FORCE_SHMLBA
diff --git a/linux-user/cris/target_syscall.h b/linux-user/cris/target_syscall.h
index 29d6900..d109a6b 100644
--- a/linux-user/cris/target_syscall.h
+++ b/linux-user/cris/target_syscall.h
@@ -40,7 +40,8 @@
 
 #define TARGET_CLONE_BACKWARDS2
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #endif
diff --git a/linux-user/hppa/target_syscall.h b/linux-user/hppa/target_syscall.h
index e2f3668..f34e05e 100644
--- a/linux-user/hppa/target_syscall.h
+++ b/linux-user/hppa/target_syscall.h
@@ -23,8 +23,9 @@
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ       2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #undef  TARGET_ENOMSG
 #define TARGET_ENOMSG          35
diff --git a/linux-user/i386/target_syscall.h b/linux-user/i386/target_syscall.h
index 2854758..ed356b3 100644
--- a/linux-user/i386/target_syscall.h
+++ b/linux-user/i386/target_syscall.h
@@ -151,8 +151,9 @@
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 #define TARGET_WANT_OLD_SYS_SELECT
 
 #endif /* I386_TARGET_SYSCALL_H */
diff --git a/linux-user/m68k/target_syscall.h b/linux-user/m68k/target_syscall.h
index c0366b1..23359a6 100644
--- a/linux-user/m68k/target_syscall.h
+++ b/linux-user/m68k/target_syscall.h
@@ -21,9 +21,9 @@
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
-
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 #define TARGET_WANT_OLD_SYS_SELECT
 
 #endif /* M68K_TARGET_SYSCALL_H */
diff --git a/linux-user/microblaze/target_syscall.h b/linux-user/microblaze/target_syscall.h
index 4141cba..7f653db 100644
--- a/linux-user/microblaze/target_syscall.h
+++ b/linux-user/microblaze/target_syscall.h
@@ -50,8 +50,9 @@
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define TARGET_WANT_NI_OLD_SELECT
 
diff --git a/linux-user/mips/target_syscall.h b/linux-user/mips/target_syscall.h
index d5509a3..dd6fd7a 100644
--- a/linux-user/mips/target_syscall.h
+++ b/linux-user/mips/target_syscall.h
@@ -234,8 +234,9 @@
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define TARGET_FORCE_SHMLBA
 
diff --git a/linux-user/mips64/target_syscall.h b/linux-user/mips64/target_syscall.h
index 8ccc468..8594955 100644
--- a/linux-user/mips64/target_syscall.h
+++ b/linux-user/mips64/target_syscall.h
@@ -231,8 +231,9 @@
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define TARGET_FORCE_SHMLBA
 
diff --git a/linux-user/nios2/target_syscall.h b/linux-user/nios2/target_syscall.h
index f3b2a50..78006c2 100644
--- a/linux-user/nios2/target_syscall.h
+++ b/linux-user/nios2/target_syscall.h
@@ -31,7 +31,8 @@
 };
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #endif /* NIOS2_TARGET_SYSCALL_H */
diff --git a/linux-user/openrisc/target_syscall.h b/linux-user/openrisc/target_syscall.h
index d586d2a..ef0d89a 100644
--- a/linux-user/openrisc/target_syscall.h
+++ b/linux-user/openrisc/target_syscall.h
@@ -16,8 +16,9 @@
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define MMAP_SHIFT TARGET_PAGE_BITS
 
diff --git a/linux-user/ppc/target_syscall.h b/linux-user/ppc/target_syscall.h
index afc0570..c461f87 100644
--- a/linux-user/ppc/target_syscall.h
+++ b/linux-user/ppc/target_syscall.h
@@ -72,8 +72,9 @@
 #define TARGET_CLONE_BACKWARDS
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
-#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
+#define TARGET_MCL_CURRENT 0x2000
+#define TARGET_MCL_FUTURE  0x4000
+#define TARGET_MCL_ONFAULT 0x8000
 #define TARGET_WANT_NI_OLD_SELECT
 
 #endif /* PPC_TARGET_SYSCALL_H */
diff --git a/linux-user/riscv/target_syscall.h b/linux-user/riscv/target_syscall.h
index a88e821..dc597c8 100644
--- a/linux-user/riscv/target_syscall.h
+++ b/linux-user/riscv/target_syscall.h
@@ -51,8 +51,9 @@
 #define UNAME_MINIMUM_RELEASE "4.15.0"
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 /* clone(flags, newsp, ptidptr, tls, ctidptr) for RISC-V */
 /* This comes from linux/kernel/fork.c, CONFIG_CLONE_BACKWARDS */
diff --git a/linux-user/s390x/target_syscall.h b/linux-user/s390x/target_syscall.h
index 8d4f609..94f8417 100644
--- a/linux-user/s390x/target_syscall.h
+++ b/linux-user/s390x/target_syscall.h
@@ -28,7 +28,8 @@
 
 #define TARGET_CLONE_BACKWARDS2
 #define TARGET_MINSIGSTKSZ        2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #endif /* S390X_TARGET_SYSCALL_H */
diff --git a/linux-user/sh4/target_syscall.h b/linux-user/sh4/target_syscall.h
index 2b5f75b..c1437ad 100644
--- a/linux-user/sh4/target_syscall.h
+++ b/linux-user/sh4/target_syscall.h
@@ -16,8 +16,9 @@
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #define TARGET_FORCE_SHMLBA
 
diff --git a/linux-user/sparc/target_syscall.h b/linux-user/sparc/target_syscall.h
index b9160a7..d8ea04e 100644
--- a/linux-user/sparc/target_syscall.h
+++ b/linux-user/sparc/target_syscall.h
@@ -21,8 +21,9 @@
  */
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      4096
-#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
-#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
+#define TARGET_MCL_CURRENT 0x2000
+#define TARGET_MCL_FUTURE  0x4000
+#define TARGET_MCL_ONFAULT 0x8000
 
 /* For SPARC SHMLBA is determined at runtime in the kernel, and
  * libc has to runtime-detect it using the hwcaps (see glibc
diff --git a/linux-user/sparc64/target_syscall.h b/linux-user/sparc64/target_syscall.h
index 3073a23..696a68b 100644
--- a/linux-user/sparc64/target_syscall.h
+++ b/linux-user/sparc64/target_syscall.h
@@ -22,8 +22,9 @@
  */
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      4096
-#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
-#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
+#define TARGET_MCL_CURRENT 0x2000
+#define TARGET_MCL_FUTURE  0x4000
+#define TARGET_MCL_ONFAULT 0x8000
 
 #define TARGET_FORCE_SHMLBA
 
diff --git a/linux-user/strace.c b/linux-user/strace.c
index 31c7be2..4ac54ec 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -1198,6 +1198,15 @@
 #endif
 };
 
+UNUSED static struct flags mlockall_flags[] = {
+    FLAG_TARGET(MCL_CURRENT),
+    FLAG_TARGET(MCL_FUTURE),
+#ifdef MCL_ONFAULT
+    FLAG_TARGET(MCL_ONFAULT),
+#endif
+    FLAG_END,
+};
+
 /*
  * print_xxx utility functions.  These are used to print syscall
  * parameters in certain format.  All of these have parameter
@@ -2009,6 +2018,18 @@
 }
 #endif
 
+#ifdef TARGET_NR_mlockall
+static void
+print_mlockall(void *cpu_env, const struct syscallname *name,
+               abi_long arg0, abi_long arg1, abi_long arg2,
+               abi_long arg3, abi_long arg4, abi_long arg5)
+{
+    print_syscall_prologue(name);
+    print_flags(mlockall_flags, arg0, 1);
+    print_syscall_epilogue(name);
+}
+#endif
+
 #if defined(TARGET_NR_socket)
 static void
 print_socket(void *cpu_env, const struct syscallname *name,
diff --git a/linux-user/strace.list b/linux-user/strace.list
index 8e5303d..d0ea7f3 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -568,13 +568,13 @@
 { TARGET_NR_mknodat, "mknodat" , NULL, print_mknodat, NULL },
 #endif
 #ifdef TARGET_NR_mlock
-{ TARGET_NR_mlock, "mlock" , NULL, NULL, NULL },
+{ TARGET_NR_mlock, "mlock" , "%s(%p," TARGET_FMT_lu ")", NULL, NULL },
 #endif
 #ifdef TARGET_NR_mlock2
 { TARGET_NR_mlock2, "mlock2" , NULL, NULL, NULL },
 #endif
 #ifdef TARGET_NR_mlockall
-{ TARGET_NR_mlockall, "mlockall" , NULL, NULL, NULL },
+{ TARGET_NR_mlockall, "mlockall" , NULL, print_mlockall, NULL },
 #endif
 #ifdef TARGET_NR_mmap
 { TARGET_NR_mmap, "mmap" , NULL, print_mmap, print_syscall_ret_addr },
@@ -637,10 +637,10 @@
 { TARGET_NR_multiplexer, "multiplexer" , NULL, NULL, NULL },
 #endif
 #ifdef TARGET_NR_munlock
-{ TARGET_NR_munlock, "munlock" , NULL, NULL, NULL },
+{ TARGET_NR_munlock, "munlock" , "%s(%p," TARGET_FMT_lu ")", NULL, NULL },
 #endif
 #ifdef TARGET_NR_munlockall
-{ TARGET_NR_munlockall, "munlockall" , NULL, NULL, NULL },
+{ TARGET_NR_munlockall, "munlockall" , "%s()", NULL, NULL },
 #endif
 #ifdef TARGET_NR_munmap
 { TARGET_NR_munmap, "munmap" , NULL, print_munmap, NULL },
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ec71921..027dea3 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6975,12 +6975,18 @@
 {
     int result = 0;
 
-    if (arg & TARGET_MLOCKALL_MCL_CURRENT) {
+    if (arg & TARGET_MCL_CURRENT) {
         result |= MCL_CURRENT;
     }
-    if (arg & TARGET_MLOCKALL_MCL_FUTURE) {
+    if (arg & TARGET_MCL_FUTURE) {
         result |= MCL_FUTURE;
     }
+#ifdef MCL_ONFAULT
+    if (arg & TARGET_MCL_ONFAULT) {
+        result |= MCL_ONFAULT;
+    }
+#endif
+
     return result;
 }
 #endif
diff --git a/linux-user/tilegx/target_syscall.h b/linux-user/tilegx/target_syscall.h
index d731acd..8e9db73 100644
--- a/linux-user/tilegx/target_syscall.h
+++ b/linux-user/tilegx/target_syscall.h
@@ -34,8 +34,9 @@
     tilegx_reg_t pad[2];
 };
 
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 /* For faultnum */
 #define TARGET_INT_SWINT_1            14
diff --git a/linux-user/x86_64/target_syscall.h b/linux-user/x86_64/target_syscall.h
index 5e221e1..3ecccb7 100644
--- a/linux-user/x86_64/target_syscall.h
+++ b/linux-user/x86_64/target_syscall.h
@@ -101,7 +101,8 @@
 #define TARGET_ARCH_GET_FS 0x1003
 #define TARGET_ARCH_GET_GS 0x1004
 #define TARGET_MINSIGSTKSZ 2048
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #endif /* X86_64_TARGET_SYSCALL_H */
diff --git a/linux-user/xtensa/target_syscall.h b/linux-user/xtensa/target_syscall.h
index 3866dad..afc86a1 100644
--- a/linux-user/xtensa/target_syscall.h
+++ b/linux-user/xtensa/target_syscall.h
@@ -43,7 +43,8 @@
     xtensa_reg_t areg[16];
 };
 
-#define TARGET_MLOCKALL_MCL_CURRENT 1
-#define TARGET_MLOCKALL_MCL_FUTURE  2
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
 
 #endif