From: Pavel Emelyanov <xemul@openvz.org>

This pid comes from user space, so treat it accordingly.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/ia64/kernel/perfmon.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN arch/ia64/kernel/perfmon.c~ia64-make-pfm_get_task-work-with-virtual-pids arch/ia64/kernel/perfmon.c
--- a/arch/ia64/kernel/perfmon.c~ia64-make-pfm_get_task-work-with-virtual-pids
+++ a/arch/ia64/kernel/perfmon.c
@@ -2654,11 +2654,11 @@ pfm_get_task(pfm_context_t *ctx, pid_t p
 	/* XXX: need to add more checks here */
 	if (pid < 2) return -EPERM;
 
-	if (pid != current->pid) {
+	if (pid != task_pid_vnr(current)) {
 
 		read_lock(&tasklist_lock);
 
-		p = find_task_by_pid(pid);
+		p = find_task_by_vpid(pid);
 
 		/* make sure task cannot go away while we operate on it */
 		if (p) get_task_struct(p);
_