mem: Use ctl's vpid, not the one from arguments

This saves some space on stack.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -1419,7 +1419,7 @@ static int dump_one_task(struct pstree_item *item)
 		goto err_cure_fdset;
 	}
 
-	item->pid.virt = misc.pid;
+	parasite_ctl->pid.virt = item->pid.virt = misc.pid;
 	item->sid = misc.sid;
 	item->pgid = misc.pgid;
 
@@ -1461,7 +1461,7 @@ static int dump_one_task(struct pstree_item *item)
 		}
 	}
 
-	ret = parasite_dump_pages_seized(parasite_ctl, item->pid.virt, &vmas, cr_fdset);
+	ret = parasite_dump_pages_seized(parasite_ctl, &vmas, cr_fdset);
 	if (ret)
 		goto err_cure;
 

include/mem.h

@@ -4,6 +4,6 @@ struct vm_area_list;
 unsigned int vmas_pagemap_size(struct vm_area_list *vmas);
 struct parasite_ctl;
 struct cr_fdset;
-int parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
+int parasite_dump_pages_seized(struct parasite_ctl *ctl,
 		struct vm_area_list *vma_area_list, struct cr_fdset *cr_fdset);
 #endif

include/parasite-syscall.h

@@ -40,7 +40,7 @@ struct vm_area_list;
 extern int parasite_dump_misc_seized(struct parasite_ctl *ctl, struct parasite_dump_misc *misc);
 struct _CredsEntry;
 extern int parasite_dump_creds(struct parasite_ctl *ctl, struct _CredsEntry *ce);
-extern int parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
+extern int parasite_dump_pages_seized(struct parasite_ctl *ctl,
 				      struct vm_area_list *vma_area_list,
 				      struct cr_fdset *cr_fdset);
 struct parasite_dump_thread;

mem.c

@@ -98,7 +98,7 @@ static int parasite_mprotect_seized(struct parasite_ctl *ctl, struct vm_area_lis
 	return parasite_execute(PARASITE_CMD_MPROTECT_VMAS, ctl);
 }
 
-static int __parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
+static int __parasite_dump_pages_seized(struct parasite_ctl *ctl,
 		struct vm_area_list *vma_area_list, struct cr_fdset *cr_fdset)
 {
 	struct parasite_dump_pages_args *args;
@@ -159,7 +159,7 @@ static int __parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
 		args->off += args->nr;
 	}
 
-	ret = open_page_xfer(&xfer, CR_FD_PAGEMAP, vpid);
+	ret = open_page_xfer(&xfer, CR_FD_PAGEMAP, ctl->pid.virt);
 	if (ret < 0)
 		goto out_pp;
 
@@ -177,7 +177,7 @@ out:
 	return ret;
 }
 
-int parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
+int parasite_dump_pages_seized(struct parasite_ctl *ctl,
 		struct vm_area_list *vma_area_list, struct cr_fdset *cr_fdset)
 {
 	int ret;
@@ -188,7 +188,7 @@ int parasite_dump_pages_seized(struct parasite_ctl *ctl, int vpid,
 		return ret;
 	}
 
-	ret = __parasite_dump_pages_seized(ctl, vpid, vma_area_list, cr_fdset);
+	ret = __parasite_dump_pages_seized(ctl, vma_area_list, cr_fdset);
 	if (ret)
 		pr_err("Can't dump page with parasite\n");