parasite: Use parasite_ctl as the argument to arch_can_dump_task

The pid is set on ctl and in the next patch I'll use one
more field.

travis-ci: success for Don't get task regs twice
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>

criu/arch/aarch64/crtools.c

@@ -42,7 +42,7 @@ void parasite_setup_regs(unsigned long new_ip, void *stack, user_regs_struct_t *
 		regs->sp = (unsigned long)stack;
 }
 
-bool arch_can_dump_task(pid_t pid)
+bool arch_can_dump_task(struct parasite_ctl *ctl)
 {
 	/*
 	 * TODO: Add proper check here

criu/arch/arm/crtools.c

@@ -46,7 +46,7 @@ void parasite_setup_regs(unsigned long new_ip, void *stack, user_regs_struct_t *
 	regs->ARM_cpsr &= PSR_f | PSR_s | PSR_x | MODE32_BIT;
 }
 
-bool arch_can_dump_task(pid_t pid)
+bool arch_can_dump_task(struct parasite_ctl *ctl)
 {
 	/*
 	 * TODO: Add proper check here

criu/arch/ppc64/crtools.c

@@ -66,7 +66,7 @@ void parasite_setup_regs(unsigned long new_ip, void *stack, user_regs_struct_t *
 	regs->trap = 0;
 }
 
-bool arch_can_dump_task(pid_t pid)
+bool arch_can_dump_task(struct parasite_ctl *ctl)
 {
 	/*
 	 * TODO: We should detect 32bit task when BE support is done.

criu/arch/x86/crtools.c

@@ -75,8 +75,10 @@ static int task_in_compat_mode(pid_t pid)
 	return cs != 0x33 || ds == 0x2b;
 }
 
-bool arch_can_dump_task(pid_t pid)
+bool arch_can_dump_task(struct parasite_ctl *ctl)
 {
+	pid_t pid = ctl->rpid;
+
 	if (task_in_compat_mode(pid)) {
 		pr_err("Can't dump task %d running in 32-bit mode\n", pid);
 		return false;

criu/include/parasite-syscall.h

@@ -117,7 +117,7 @@ extern int syscall_seized(struct parasite_ctl *ctl, int nr, unsigned long *ret,
 
 extern int __parasite_execute_syscall(struct parasite_ctl *ctl,
 		user_regs_struct_t *regs, const char *code_syscall);
-extern bool arch_can_dump_task(pid_t pid);
+extern bool arch_can_dump_task(struct parasite_ctl *ctl);
 
 /*
  * The PTRACE_SYSCALL will trap task twice -- on

criu/parasite-syscall.c

@@ -1365,7 +1365,7 @@ struct parasite_ctl *parasite_infect_seized(pid_t pid, struct pstree_item *item,
 	parasite_ensure_args_size(dump_pages_args_size(vma_area_list));
 	parasite_ensure_args_size(aio_rings_args_size(vma_area_list));
 
-	if (!arch_can_dump_task(pid))
+	if (!arch_can_dump_task(ctl))
 		goto err_restore;
 	/*
 	 * Inject a parasite engine. Ie allocate memory inside alien