diff --git a/linux-user/aarch64/syscall.h b/linux-user/aarch64/syscall.h
index d1f4823..dc72a15 100644
--- a/linux-user/aarch64/syscall.h
+++ b/linux-user/aarch64/syscall.h
@@ -9,3 +9,5 @@ struct target_pt_regs {
 #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
diff --git a/linux-user/alpha/syscall.h b/linux-user/alpha/syscall.h
index 3adedeb..245cff2 100644
--- a/linux-user/alpha/syscall.h
+++ b/linux-user/alpha/syscall.h
@@ -253,3 +253,5 @@ struct target_pt_regs {
 #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
diff --git a/linux-user/arm/syscall.h b/linux-user/arm/syscall.h
index cdadb0c..3844a96 100644
--- a/linux-user/arm/syscall.h
+++ b/linux-user/arm/syscall.h
@@ -46,3 +46,5 @@ struct target_pt_regs {
 #define TARGET_CLONE_BACKWARDS
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/cris/syscall.h b/linux-user/cris/syscall.h
index a75bcc4..2957b0d 100644
--- a/linux-user/cris/syscall.h
+++ b/linux-user/cris/syscall.h
@@ -40,5 +40,7 @@ struct target_pt_regs {
 
 #define TARGET_CLONE_BACKWARDS2
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
 
 #endif
diff --git a/linux-user/i386/syscall.h b/linux-user/i386/syscall.h
index acf6856..906aaac 100644
--- a/linux-user/i386/syscall.h
+++ b/linux-user/i386/syscall.h
@@ -148,3 +148,5 @@ struct target_vm86plus_struct {
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/m68k/syscall.h b/linux-user/m68k/syscall.h
index f8553f8..9218493 100644
--- a/linux-user/m68k/syscall.h
+++ b/linux-user/m68k/syscall.h
@@ -19,5 +19,7 @@ struct target_pt_regs {
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
 
 void do_m68k_simcall(CPUM68KState *, int);
diff --git a/linux-user/microblaze/syscall.h b/linux-user/microblaze/syscall.h
index 2a5e160..3c1ed27 100644
--- a/linux-user/microblaze/syscall.h
+++ b/linux-user/microblaze/syscall.h
@@ -50,5 +50,7 @@ struct target_pt_regs {
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
 
 #endif
diff --git a/linux-user/mips/syscall.h b/linux-user/mips/syscall.h
index 0b4662c..35ca23b 100644
--- a/linux-user/mips/syscall.h
+++ b/linux-user/mips/syscall.h
@@ -229,3 +229,5 @@ struct target_pt_regs {
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/mips64/syscall.h b/linux-user/mips64/syscall.h
index 39b8bed..6733107 100644
--- a/linux-user/mips64/syscall.h
+++ b/linux-user/mips64/syscall.h
@@ -226,3 +226,5 @@ struct target_pt_regs {
 
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/openrisc/syscall.h b/linux-user/openrisc/syscall.h
index e5e6180..8ac0365 100644
--- a/linux-user/openrisc/syscall.h
+++ b/linux-user/openrisc/syscall.h
@@ -25,3 +25,5 @@ struct target_pt_regs {
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/ppc/syscall.h b/linux-user/ppc/syscall.h
index 5311cc6..0daf5cd 100644
--- a/linux-user/ppc/syscall.h
+++ b/linux-user/ppc/syscall.h
@@ -71,3 +71,5 @@ struct target_revectored_struct {
 #define TARGET_CLONE_BACKWARDS
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
+#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
diff --git a/linux-user/s390x/syscall.h b/linux-user/s390x/syscall.h
index b11a3b2..35f170a 100644
--- a/linux-user/s390x/syscall.h
+++ b/linux-user/s390x/syscall.h
@@ -25,3 +25,5 @@ struct target_pt_regs {
 
 #define TARGET_CLONE_BACKWARDS2
 #define TARGET_MINSIGSTKSZ        2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/sh4/syscall.h b/linux-user/sh4/syscall.h
index 285ecf3..7aa4f23 100644
--- a/linux-user/sh4/syscall.h
+++ b/linux-user/sh4/syscall.h
@@ -13,3 +13,5 @@ struct target_pt_regs {
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
diff --git a/linux-user/sparc/syscall.h b/linux-user/sparc/syscall.h
index ae40744..58573b9 100644
--- a/linux-user/sparc/syscall.h
+++ b/linux-user/sparc/syscall.h
@@ -16,3 +16,5 @@ struct target_pt_regs {
  */
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      4096
+#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
+#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
diff --git a/linux-user/sparc64/syscall.h b/linux-user/sparc64/syscall.h
index 816a00f..8398d3f 100644
--- a/linux-user/sparc64/syscall.h
+++ b/linux-user/sparc64/syscall.h
@@ -17,3 +17,5 @@ struct target_pt_regs {
  */
 #define TARGET_CLONE_BACKWARDS
 #define TARGET_MINSIGSTKSZ      4096
+#define TARGET_MLOCKALL_MCL_CURRENT 0x2000
+#define TARGET_MLOCKALL_MCL_FUTURE  0x4000
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index fc828ae..edc48e1 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4937,6 +4937,21 @@ static inline abi_long host_to_target_itimerspec(abi_ulong target_addr,
     return 0;
 }
 
+#if defined(TARGET_NR_mlockall)
+static inline int target_to_host_mlockall_arg(int arg)
+{
+    int result = 0;
+
+    if (arg & TARGET_MLOCKALL_MCL_CURRENT) {
+        result |= MCL_CURRENT;
+    }
+    if (arg & TARGET_MLOCKALL_MCL_FUTURE) {
+        result |= MCL_FUTURE;
+    }
+    return result;
+}
+#endif
+
 #if defined(TARGET_NR_stat64) || defined(TARGET_NR_newfstatat)
 static inline abi_long host_to_target_stat64(void *cpu_env,
                                              abi_ulong target_addr,
@@ -6786,7 +6801,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #ifdef TARGET_NR_mlockall
     case TARGET_NR_mlockall:
-        ret = get_errno(mlockall(arg1));
+        ret = get_errno(mlockall(target_to_host_mlockall_arg(arg1)));
         break;
 #endif
 #ifdef TARGET_NR_munlockall
diff --git a/linux-user/unicore32/syscall.h b/linux-user/unicore32/syscall.h
index 3ed6237..385a975 100644
--- a/linux-user/unicore32/syscall.h
+++ b/linux-user/unicore32/syscall.h
@@ -54,5 +54,7 @@ struct target_pt_regs {
 #define UNAME_MINIMUM_RELEASE "2.6.32"
 
 #define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MLOCKALL_MCL_CURRENT 1
+#define TARGET_MLOCKALL_MCL_FUTURE  2
 
 #endif /* __UC32_SYSCALL_H__ */
diff --git a/linux-user/x86_64/syscall.h b/linux-user/x86_64/syscall.h
index 5828b91..88b3c3f 100644
--- a/linux-user/x86_64/syscall.h
+++ b/linux-user/x86_64/syscall.h
@@ -98,3 +98,5 @@ struct target_msqid64_ds {
 #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
