parasite: fix size of cmd

cmd is declarated in parasite-head-x86-64.S
__export_parasite_cmd:
        .long 0

Its size is 4 bytes, so it should be int instead of long.

This patch fixes a bug in parasite execute,
where a part of args are overwritten by cmd.

memcpy(ctl->addr_cmd, &cmd, sizeof(cmd));
Reported-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

parasite-syscall.c

@@ -221,7 +221,7 @@ err:
 	return ret;
 }
 
-static int parasite_execute_by_pid(unsigned long cmd, struct parasite_ctl *ctl,
+static int parasite_execute_by_pid(unsigned int cmd, struct parasite_ctl *ctl,
 			    pid_t pid,
 			    void *args, int args_size)
 {
@@ -265,7 +265,7 @@ static int parasite_execute_by_pid(unsigned long cmd, struct parasite_ctl *ctl,
 	return ret;
 }
 
-static int parasite_execute(unsigned long cmd, struct parasite_ctl *ctl,
+static int parasite_execute(unsigned int cmd, struct parasite_ctl *ctl,
 			    void *args, int args_size)
 {
 	return parasite_execute_by_pid(cmd, ctl, ctl->pid, args, args_size);

parasite.c

@@ -452,7 +452,7 @@ static int fini(void)
 	return 0;
 }
 
-int __used parasite_service(unsigned long cmd, void *args)
+int __used parasite_service(unsigned int cmd, void *args)
 {
 	BUILD_BUG_ON(sizeof(struct parasite_dump_pages_args) > PARASITE_ARG_SIZE);
 	BUILD_BUG_ON(sizeof(struct parasite_init_args) > PARASITE_ARG_SIZE);