vdso: Put CONFIG_VDSO where needed

Guard vDSO code with CONFIG_VDSO, no need to even build it
on archs which do not support vDSO handling.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-restore.c

@@ -2286,9 +2286,11 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 	void *tcp_socks_mem;
 	unsigned long tcp_socks;
 
+#ifdef CONFIG_VDSO
 	unsigned long vdso_rt_vma_size = 0;
 	unsigned long vdso_rt_size = 0;
 	unsigned long vdso_rt_delta = 0;
+#endif
 
 	struct vm_area_list self_vmas;
 	struct vm_area_list *vmas = &current->rst->vmas;
@@ -2351,6 +2353,7 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 				TASK_ENTRIES_SIZE +
 				rst_mem_remap_size();
 
+#ifdef CONFIG_VDSO
 	/*
 	 * Figure out how much memory runtime vdso will need.
 	 */
@@ -2361,6 +2364,7 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 	}
 
 	restore_bootstrap_len += vdso_rt_size;
+#endif
 
 	/*
 	 * Restorer is a blob (code + args) that will get mapped in some
@@ -2440,7 +2444,9 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 
 	task_args->bootstrap_start = (void *)exec_mem_hint;
 	task_args->bootstrap_len = restore_bootstrap_len;
+#ifdef CONFIG_VDSO
 	task_args->vdso_rt_size = vdso_rt_size;
+#endif
 
 	task_args->premmapped_addr = (unsigned long) current->rst->premmapped_addr;
 	task_args->premmapped_len = current->rst->premmapped_len;
@@ -2547,6 +2553,7 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 
 	}
 
+#ifdef CONFIG_VDSO
 	/*
 	 * Restorer needs own copy of vdso parameters. Runtime
 	 * vdso must be kept non intersecting with anything else,
@@ -2556,6 +2563,7 @@ static int sigreturn_restore(pid_t pid, CoreEntry *core)
 	mem += rst_mem_remap_size();
 	task_args->vdso_rt_parked_at = (unsigned long)mem + vdso_rt_delta;
 	task_args->vdso_sym_rt = vdso_sym_rt;
+#endif
 
 	new_sp = restorer_stack(task_args->t);
 

include/parasite-syscall.h

@@ -4,6 +4,7 @@
 #include "asm/types.h"
 #include "pid.h"
 #include "list.h"
+#include "config.h"
 
 #define BUILTIN_SYSCALL_SIZE	8
 
@@ -118,8 +119,10 @@ extern int __parasite_execute_syscall(struct parasite_ctl *ctl,
 				user_regs_struct_t *regs);
 extern bool arch_can_dump_task(pid_t pid);
 
+#ifdef CONFIG_VFDO
 extern int parasite_fixup_vdso(struct parasite_ctl *ctl, pid_t pid,
 			       struct vm_area_list *vma_area_list);
+#endif
 
 extern int parasite_stop_on_syscall(int tasks, int sys_nr);
 extern int parasite_unmap(struct parasite_ctl *ctl, unsigned long addr);

include/restorer.h

@@ -13,6 +13,7 @@
 #include "util.h"
 #include "asm/restorer.h"
 #include "rst_info.h"
+#include "config.h"
 
 #include "posix-timer.h"
 #include "shmem.h"
@@ -118,7 +119,6 @@ struct task_restore_args {
 
 	void				*bootstrap_start;
 	unsigned long			bootstrap_len;
-	unsigned long			vdso_rt_size;
 
 	struct itimerval		itimers[3];
 
@@ -145,8 +145,11 @@ struct task_restore_args {
 
 	int				fd_last_pid; /* sys.ns_last_pid for threads rst */
 
+#ifdef CONFIG_VDSO
+	unsigned long			vdso_rt_size;
 	struct vdso_symtable		vdso_sym_rt;		/* runtime vdso symbols */
 	unsigned long			vdso_rt_parked_at;	/* safe place to keep vdso */
+#endif
 } __aligned(64);
 
 #define RESTORE_ALIGN_STACK(start, size)	\

pie/parasite.c

@@ -8,6 +8,7 @@
 
 #include "syscall.h"
 #include "parasite.h"
+#include "config.h"
 #include "fcntl.h"
 #include "prctl.h"
 #include "lock.h"
@@ -324,6 +325,7 @@ err:
 	return 0;
 }
 
+#ifdef CONFIG_VDSO
 static int parasite_check_vdso_mark(struct parasite_vdso_vma_entry *args)
 {
 	struct vdso_mark *m = (void *)args->start;
@@ -338,6 +340,7 @@ static int parasite_check_vdso_mark(struct parasite_vdso_vma_entry *args)
 
 	return 0;
 }
+#endif
 
 static int __parasite_daemon_reply_ack(unsigned int cmd, int err)
 {
@@ -459,9 +462,11 @@ static noinline __used int noinline parasite_daemon(void *args)
 		case PARASITE_CMD_DUMP_TTY:
 			ret = parasite_dump_tty(args);
 			break;
+#ifdef CONFIG_VDSO
 		case PARASITE_CMD_CHECK_VDSO_MARK:
 			ret = parasite_check_vdso_mark(args);
 			break;
+#endif
 		default:
 			pr_err("Unknown command in parasite daemon thread leader: %d\n", m.cmd);
 			ret = -1;

pie/restorer.c

@@ -18,6 +18,7 @@
 #include "compiler.h"
 #include "asm/types.h"
 #include "syscall.h"
+#include "config.h"
 #include "prctl.h"
 #include "log.h"
 #include "util.h"
@@ -538,16 +539,23 @@ static void restore_posix_timers(struct task_restore_args *args)
 }
 static void *bootstrap_start;
 static unsigned int bootstrap_len;
-static unsigned long vdso_rt_size;
 
-void __export_unmap(void)
-{
-	sys_munmap(bootstrap_start, bootstrap_len - vdso_rt_size);
-	/*
+/*
  * sys_munmap must not return here. The controll process must
  * trap us on the exit from sys_munmap.
  */
+#ifdef CONFIG_VDSO
+static unsigned long vdso_rt_size;
+void __export_unmap(void)
+{
+	sys_munmap(bootstrap_start, bootstrap_len - vdso_rt_size);
+}
+#else
+void __export_unmap(void)
+{
+	sys_munmap(bootstrap_start, bootstrap_len);
 }
+#endif
 
 /*
  * This function unmaps all VMAs, which don't belong to
@@ -628,7 +636,10 @@ long __export_restore_task(struct task_restore_args *args)
 
 	bootstrap_start = args->bootstrap_start;
 	bootstrap_len	= args->bootstrap_len;
+
+#ifdef CONFIG_VDSO
 	vdso_rt_size	= args->vdso_rt_size;
+#endif
 
 	task_entries = args->task_entries;
 
@@ -645,10 +656,12 @@ long __export_restore_task(struct task_restore_args *args)
 
 	pr_info("Switched to the restorer %d\n", my_pid);
 
+#ifdef CONFIG_VDSO
 	if (vdso_remap("rt-vdso", args->vdso_sym_rt.vma_start,
 		       args->vdso_rt_parked_at,
 		       vdso_vma_size(&args->vdso_sym_rt)))
 		goto core_restore_end;
+#endif
 
 	if (unmap_old_vmas((void *)args->premmapped_addr, args->premmapped_len,
 				bootstrap_start, bootstrap_len))
@@ -673,12 +686,13 @@ long __export_restore_task(struct task_restore_args *args)
 		if (vma_remap(vma_premmaped_start(vma_entry),
 				vma_entry->start, vma_entry_len(vma_entry)))
 			goto core_restore_end;
-
+#ifdef CONFIG_VDSO
 		if (vma_entry_is(vma_entry, VMA_AREA_VDSO)) {
 			if (vdso_proxify("left dumpee", &args->vdso_sym_rt,
 					 vma_entry, args->vdso_rt_parked_at))
 				goto core_restore_end;
 		}
+#endif
 	}
 
 	/* Shift private vma-s to the right */
@@ -700,12 +714,13 @@ long __export_restore_task(struct task_restore_args *args)
 		if (vma_remap(vma_premmaped_start(vma_entry),
 				vma_entry->start, vma_entry_len(vma_entry)))
 			goto core_restore_end;
-
+#ifdef CONFIG_VDSO
 		if (vma_entry_is(vma_entry, VMA_AREA_VDSO)) {
 			if (vdso_proxify("right dumpee", &args->vdso_sym_rt,
 					 vma_entry, args->vdso_rt_parked_at))
 				goto core_restore_end;
 		}
+#endif
 	}
 
 	/*