pids: kill signal_struct-> __pgrp/__session and friends

We are wasting 2 words in signal_struct without any reason to implement
task_pgrp_nr() and task_session_nr().

task_session_nr() has no callers since
2e2ba22ea4fd4bb85f0fa37c521066db6775cbef, we can remove it.

task_pgrp_nr() is still (I believe wrongly) used in fs/autofsX and
fs/coda.

This patch reimplements task_pgrp_nr() via task_pgrp_nr_ns(), and kills
__pgrp/__session and the related helpers.

The change in drivers/char/tty_io.c is cosmetic, but hopefully makes sense
anyway.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Alan Cox <number6@the-village.bc.nu>		[tty parts]
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index a44b701c5bba..66b99a2049e3 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2681,7 +2681,7 @@ void __do_SAK(struct tty_struct *tty)
         /* Kill the entire session */
         do_each_pid_task(session, PIDTYPE_SID, p) {
                 printk(KERN_NOTICE "SAK: killed process %d"
-                        " (%s): task_session_nr(p)==tty->session\n",
+                        " (%s): task_session(p)==tty->session\n",
                         task_pid_nr(p), p->comm);
                 send_sig(SIGKILL, p, 1);
         } while_each_pid_task(session, PIDTYPE_SID, p);
@@ -2691,7 +2691,7 @@ void __do_SAK(struct tty_struct *tty)
         do_each_thread(g, p) {
                 if (p->signal->tty == tty) {
                         printk(KERN_NOTICE "SAK: killed process %d"
-                            " (%s): task_session_nr(p)==tty->session\n",
+                            " (%s): task_session(p)==tty->session\n",
                             task_pid_nr(p), p->comm);
                         send_sig(SIGKILL, p, 1);
                         continue;