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authorEric W. Biederman <ebiederm@xmission.com>2007-02-12 00:53:00 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-12 09:48:32 -0800
commitab521dc0f8e117fd808d3e425216864d60390500 (patch)
treef9d6449c4d8c9508fd43edfe845108043e1536b2 /kernel
parent3e7cd6c413c9e6fbb5e1ee2acdadb4ababd2d474 (diff)
[PATCH] tty: update the tty layer to work with struct pid
Of kernel subsystems that work with pids the tty layer is probably the largest consumer. But it has the nice virtue that the assiation with a session only lasts until the session leader exits. Which means that no reference counting is required. So using struct pid winds up being a simple optimization to avoid hash table lookups. In the long term the use of pid_nr also ensures that when we have multiple pid spaces mixed everything will work correctly. Signed-off-by: Eric W. Biederman <eric@maxwell.lnxi.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c2
-rw-r--r--kernel/sys.c1
2 files changed, 1 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 80284eb488c..0b6293d94d9 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -869,7 +869,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
sig->it_prof_incr = cputime_zero;
sig->leader = 0; /* session leadership doesn't inherit */
- sig->tty_old_pgrp = 0;
+ sig->tty_old_pgrp = NULL;
sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
diff --git a/kernel/sys.c b/kernel/sys.c
index e1024383314..efcf76e0dad 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1510,7 +1510,6 @@ asmlinkage long sys_setsid(void)
spin_lock(&group_leader->sighand->siglock);
group_leader->signal->tty = NULL;
- group_leader->signal->tty_old_pgrp = 0;
spin_unlock(&group_leader->sighand->siglock);
err = process_group(group_leader);