kgdbts: switch to kernel_clone()

The old _do_fork() helper is removed in favor of the new kernel_clone() helper.
The latter adheres to naming conventions for kernel internal syscall helpers.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Tested-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: kgdb-bugreport@lists.sourceforge.net
Link: https://lore.kernel.org/r/20200819104655.436656-10-christian.brauner@ubuntu.com

drivers/misc/kgdbts.c

@@ -33,16 +33,16 @@
  * You can also specify optional tests:
  * N## = Go to sleep with interrupts of for ## seconds
  *       to test the HW NMI watchdog
- * F## = Break at do_fork for ## iterations
+ * F## = Break at kernel_clone for ## iterations
  * S## = Break at sys_open for ## iterations
  * I## = Run the single step test ## iterations
  *
- * NOTE: that the do_fork and sys_open tests are mutually exclusive.
+ * NOTE: that the kernel_clone and sys_open tests are mutually exclusive.
  *
  * To invoke the kgdb test suite from boot you use a kernel start
  * argument as follows:
  * 	kgdbts=V1 kgdbwait
- * Or if you wanted to perform the NMI test for 6 seconds and do_fork
+ * Or if you wanted to perform the NMI test for 6 seconds and kernel_clone
  * test for 100 forks, you could use:
  * 	kgdbts=V1N6F100 kgdbwait
  *
@@ -74,7 +74,7 @@
  * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
  * fg # and hit control-c
  * fg # and hit control-c
- * ## This tests break points on do_fork
+ * ## This tests break points on kernel_clone
  * while [ 1 ] ; do date > /dev/null ; done &
  * while [ 1 ] ; do date > /dev/null ; done &
  * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
@@ -209,8 +209,8 @@ static unsigned long lookup_addr(char *arg)
 		addr = (unsigned long)kgdbts_break_test;
 	else if (!strcmp(arg, "sys_open"))
 		addr = (unsigned long)do_sys_open;
-	else if (!strcmp(arg, "do_fork"))
+	else if (!strcmp(arg, "kernel_clone"))
-		addr = (unsigned long)_do_fork;
+		addr = (unsigned long)kernel_clone;
 	else if (!strcmp(arg, "hw_break_val"))
 		addr = (unsigned long)&hw_break_val;
 	addr = (unsigned long) dereference_function_descriptor((void *)addr);
@@ -310,7 +310,7 @@ static int check_and_rewind_pc(char *put_str, char *arg)
 
 	if (arch_needs_sstep_emulation && sstep_addr &&
 	    ip + offset == sstep_addr &&
-	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
+	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "kernel_clone")))) {
 		/* This is special case for emulated single step */
 		v2printk("Emul: rewind hit single step bp\n");
 		restart_from_top_after_write = 1;
@@ -596,19 +596,19 @@ static struct test_struct singlestep_break_test[] = {
 };
 
 /*
- * Test for hitting a breakpoint at do_fork for what ever the number
+ * Test for hitting a breakpoint at kernel_clone for what ever the number
  * of iterations required by the variable repeat_test.
  */
-static struct test_struct do_fork_test[] = {
+static struct test_struct do_kernel_clone_test[] = {
 	{ "?", "S0*" }, /* Clear break points */
-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
 	{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
-	{ "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
+	{ "kernel_clone", "OK", sw_rem_break }, /*remove breakpoint */
-	{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
+	{ "g", "kernel_clone", NULL, check_and_rewind_pc }, /* check location */
 	{ "write", "OK", write_regs, emul_reset }, /* Write registers */
 	{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
-	{ "g", "do_fork", NULL, check_single_step },
+	{ "g", "kernel_clone", NULL, check_single_step },
-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
 	{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
 	{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
 	{ "", "", get_cont_catch, put_cont_catch },
@@ -935,11 +935,11 @@ static void run_bad_read_test(void)
 	kgdb_breakpoint();
 }
 
-static void run_do_fork_test(void)
+static void run_kernel_clone_test(void)
 {
 	init_simple_test();
-	ts.tst = do_fork_test;
+	ts.tst = do_kernel_clone_test;
-	ts.name = "do_fork_test";
+	ts.name = "do_kernel_clone_test";
 	/* Activate test with initial breakpoint */
 	kgdb_breakpoint();
 }
@@ -967,7 +967,7 @@ static void run_singlestep_break_test(void)
 static void kgdbts_run_tests(void)
 {
 	char *ptr;
-	int fork_test = 0;
+	int clone_test = 0;
 	int do_sys_open_test = 0;
 	int sstep_test = 1000;
 	int nmi_sleep = 0;
@@ -981,7 +981,7 @@ static void kgdbts_run_tests(void)
 
 	ptr = strchr(config, 'F');
 	if (ptr)
-		fork_test = simple_strtol(ptr + 1, NULL, 10);
+		clone_test = simple_strtol(ptr + 1, NULL, 10);
 	ptr = strchr(config, 'S');
 	if (ptr)
 		do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
@@ -1025,16 +1025,16 @@ static void kgdbts_run_tests(void)
 		run_nmi_sleep_test(nmi_sleep);
 	}
 
-	/* If the do_fork test is run it will be the last test that is
+	/* If the kernel_clone test is run it will be the last test that is
 	 * executed because a kernel thread will be spawned at the very
 	 * end to unregister the debug hooks.
 	 */
-	if (fork_test) {
+	if (clone_test) {
-		repeat_test = fork_test;
+		repeat_test = clone_test;
-		printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
+		printk(KERN_INFO "kgdbts:RUN kernel_clone for %i breakpoints\n",
 			repeat_test);
 		kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
-		run_do_fork_test();
+		run_kernel_clone_test();
 		return;
 	}