2 files changed, 34 insertions, 22 deletions

diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index 32c61189110c..46fa10ab9892 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -22,6 +22,29 @@
 
 extern char __syscall_stub_start[];
 
+void syscall_stub_dump_error(struct mm_id *mm_idp)
+{
+	struct stub_data *proc_data = (void *)mm_idp->stack;
+	struct stub_syscall *sc;
+
+	if (proc_data->syscall_data_len < 0 ||
+	    proc_data->syscall_data_len >= ARRAY_SIZE(proc_data->syscall_data))
+		panic("Syscall data was corrupted by stub (len is: %d, expected maximum: %d)!",
+			proc_data->syscall_data_len,
+			mm_idp->syscall_data_len);
+
+	sc = &proc_data->syscall_data[proc_data->syscall_data_len];
+
+	printk(UM_KERN_ERR "%s : length = %d, last offset = %d",
+		__func__, mm_idp->syscall_data_len,
+		proc_data->syscall_data_len);
+	printk(UM_KERN_ERR "%s : stub syscall type %d failed, return value = 0x%lx\n",
+		__func__, sc->syscall, proc_data->err);
+
+	print_hex_dump(UM_KERN_ERR, "    syscall data: ", 0,
+		       16, 4, sc, sizeof(*sc), 0);
+}
+
 static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
 					      unsigned long *stack)
 {
@@ -82,26 +105,9 @@ static inline long do_syscall_stub(struct mm_id *mm_idp)
 	 * otherwise it will be zero (but we do not need to rely on that).
 	 */
 	if (proc_data->err < 0) {
-		struct stub_syscall *sc;
-
-		if (proc_data->syscall_data_len < 0 ||
-		    proc_data->syscall_data_len >= ARRAY_SIZE(proc_data->syscall_data))
-			panic("Syscall data was corrupted by stub (len is: %d, expected maximum: %d)!",
-			      proc_data->syscall_data_len,
-			      mm_idp->syscall_data_len);
-
-		sc = &proc_data->syscall_data[proc_data->syscall_data_len];
-
-		printk(UM_KERN_ERR "%s : length = %d, last offset = %d",
-		       __func__, mm_idp->syscall_data_len,
-		       proc_data->syscall_data_len);
-		printk(UM_KERN_ERR "%s : stub syscall type %d failed, return value = 0x%lx\n",
-		       __func__, sc->syscall, proc_data->err);
-
-		print_hex_dump(UM_KERN_ERR,
-			       "    syscall data: ", 0,
-			       16, 4, sc, sizeof(*sc), 0);
+		syscall_stub_dump_error(mm_idp);
 
+		/* Store error code in case someone tries to add more syscalls */
 		mm_idp->syscall_data_len = proc_data->err;
 	} else {
 		mm_idp->syscall_data_len = 0;
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 566b8ecccc3f..9cb61610147a 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -254,7 +254,6 @@ static int userspace_tramp(void *stack)
 }
 
 int userspace_pid[NR_CPUS];
-int kill_userspace_mm[NR_CPUS];
 
 /**
  * start_userspace() - prepare a new userspace process
@@ -348,8 +347,16 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
 	while (1) {
 		time_travel_print_bc_msg();
 
-		if (kill_userspace_mm[0])
+		/* Flush out any pending syscalls */
+		err = syscall_stub_flush(current_mm_id());
+		if (err) {
+			if (err == -ENOMEM)
+				report_enomem();
+
+			printk(UM_KERN_ERR "%s - Error flushing stub syscalls: %d",
+				__func__, -err);
 			fatal_sigsegv();
+		}
 
 		/*
 		 * This can legitimately fail if the process loads a
@@ -580,5 +587,4 @@ void reboot_skas(void)
 void __switch_mm(struct mm_id *mm_idp)
 {
 	userspace_pid[0] = mm_idp->u.pid;
-	kill_userspace_mm[0] = mm_idp->kill;
 }