[PATCH] add process_session() helper routine: deprecate old field

Add an anonymous union and ((deprecated)) to catch direct usage of the
session field.

[akpm@osdl.org: fix various missed conversions]
[jdike@addtoit.com: fix UML bug]
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 23 insertions, 7 deletions

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 733790d4f7db..848a68af3d42 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -57,17 +57,18 @@
         .cpu_vm_mask    = CPU_MASK_ALL,                         \
 }
 
-#define INIT_SIGNALS(sig) {     \
-        .count          = ATOMIC_INIT(1),               \
+#define INIT_SIGNALS(sig) {                                             \
+        .count          = ATOMIC_INIT(1),                               \
         .wait_chldexit  = __WAIT_QUEUE_HEAD_INITIALIZER(sig.wait_chldexit),\
-        .shared_pending = {                             \
+        .shared_pending = {                                             \
                 .list = LIST_HEAD_INIT(sig.shared_pending.list),        \
-                .signal =  {{0}}}, \
+                .signal =  {{0}}},                                      \
         .posix_timers    = LIST_HEAD_INIT(sig.posix_timers),            \
         .cpu_timers     = INIT_CPU_TIMERS(sig.cpu_timers),              \
         .rlim           = INIT_RLIMITS,                                 \
         .pgrp           = 1,                                            \
-        .session        = 1,                                            \
+        .tty_old_pgrp   = 0,                                            \
+        { .__session      = 1},                                         \
 }
 
 extern struct nsproxy init_nsproxy;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 270d864a8ff1..6fec1d419714 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -436,7 +436,12 @@ struct signal_struct {
         /* job control IDs */
         pid_t pgrp;
         pid_t tty_old_pgrp;
-        pid_t session;
+
+        union {
+                pid_t session __deprecated;
+                pid_t __session;
+        };
+
         /* boolean value for session group leader */
         int leader;
 
@@ -1047,9 +1052,19 @@ static inline pid_t process_group(struct task_struct *tsk)
         return tsk->signal->pgrp;
 }
 
+static inline pid_t signal_session(struct signal_struct *sig)
+{
+        return sig->__session;
+}
+
 static inline pid_t process_session(struct task_struct *tsk)
 {
-        return tsk->signal->session;
+        return signal_session(tsk->signal);
+}
+
+static inline void set_signal_session(struct signal_struct *sig, pid_t session)
+{
+        sig->__session = session;
 }
 
 static inline struct pid *task_pid(struct task_struct *task)