subject:"\[PATCH 1\/5\] statically initialize struct pid for swapper"

[PATCH 1/5] statically initialize struct pid for swapper

2007-03-12 Thread sukadev



From: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Subject: [PATCH 1/5] statically initialize struct pid for swapper

Statically initialize a struct pid for the swapper process (pid_t == 0) and
attach it to init_task.  This is needed so task_pid(), task_pgrp() and
task_session() interfaces work on the swapper process also.

Signed-off-by: Sukadev Bhattiprolu <[EMAIL PROTECTED]>
Cc: Cedric Le Goater <[EMAIL PROTECTED]>
Cc: Dave Hansen <[EMAIL PROTECTED]>
Cc: Serge Hallyn <[EMAIL PROTECTED]>
Cc: Eric Biederman <[EMAIL PROTECTED]>
Cc: Herbert Poetzl <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Acked-by: Eric W. Biederman <[EMAIL PROTECTED]>
---

 include/linux/init_task.h |   27 +++
 include/linux/pid.h   |2 ++
 kernel/pid.c  |2 ++
 3 files changed, 31 insertions(+)

Index: lx26-20-mm2c/include/linux/init_task.h
===
--- lx26-20-mm2c.orig/include/linux/init_task.h 2007-02-28 15:47:44.0 
-0800
+++ lx26-20-mm2c/include/linux/init_task.h  2007-02-28 15:48:07.0 
-0800
@@ -96,6 +96,28 @@ extern struct group_info init_groups;
 #define INIT_PREEMPT_RCU
 #endif
 
+#define INIT_STRUCT_PID {  \
+   .count  = ATOMIC_INIT(1),   \
+   .nr = 0,\
+   /* Don't put this struct pid in pid_hash */ \
+   .pid_chain  = { .next = NULL, .pprev = NULL },  \
+   .tasks  = { \
+   { .first = _task.pids[PIDTYPE_PID].node }, \
+   { .first = _task.pids[PIDTYPE_PGID].node },\
+   { .first = _task.pids[PIDTYPE_SID].node }, \
+   },  \
+   .rcu= RCU_HEAD_INIT,\
+}
+
+#define INIT_PID_LINK(type)\
+{  \
+   .node = {   \
+   .next = NULL,   \
+   .pprev = _struct_pid.tasks[type].first,\
+   },  \
+   .pid = _struct_pid,\
+}
+
 /*
  *  INIT_TASK is used to set up the first task table, touch at
  * your own risk!. Base=0, limit=0x1f (=2MB)
@@ -145,6 +167,11 @@ extern struct group_info init_groups;
.cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers),  \
.fs_excl= ATOMIC_INIT(0),   \
.pi_lock= SPIN_LOCK_UNLOCKED,   \
+   .pids = {   \
+   [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),\
+   [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),   \
+   [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),\
+   },  \
INIT_TRACE_IRQFLAGS \
INIT_LOCKDEP\
 }
Index: lx26-20-mm2c/include/linux/pid.h
===
--- lx26-20-mm2c.orig/include/linux/pid.h   2007-02-28 15:48:07.0 
-0800
+++ lx26-20-mm2c/include/linux/pid.h2007-02-28 15:48:07.0 -0800
@@ -51,6 +51,8 @@ struct pid
struct rcu_head rcu;
 };
 
+extern struct pid init_struct_pid;
+
 struct pid_link
 {
struct hlist_node node;
Index: lx26-20-mm2c/kernel/pid.c
===
--- lx26-20-mm2c.orig/kernel/pid.c  2007-02-28 15:48:07.0 -0800
+++ lx26-20-mm2c/kernel/pid.c   2007-02-28 15:48:07.0 -0800
@@ -27,11 +27,13 @@
 #include 
 #include 
 #include 
+#include 
 
 #define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift)
 static struct hlist_head *pid_hash;
 static int pidhash_shift;
 static struct kmem_cache *pid_cachep;
+struct pid init_struct_pid = INIT_STRUCT_PID;
 
 int pid_max = PID_MAX_DEFAULT;
 
-
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[PATCH 1/5] statically initialize struct pid for swapper

2007-03-12 Thread sukadev



From: Sukadev Bhattiprolu [EMAIL PROTECTED]
Subject: [PATCH 1/5] statically initialize struct pid for swapper

Statically initialize a struct pid for the swapper process (pid_t == 0) and
attach it to init_task.  This is needed so task_pid(), task_pgrp() and
task_session() interfaces work on the swapper process also.

Signed-off-by: Sukadev Bhattiprolu [EMAIL PROTECTED]
Cc: Cedric Le Goater [EMAIL PROTECTED]
Cc: Dave Hansen [EMAIL PROTECTED]
Cc: Serge Hallyn [EMAIL PROTECTED]
Cc: Eric Biederman [EMAIL PROTECTED]
Cc: Herbert Poetzl [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Acked-by: Eric W. Biederman [EMAIL PROTECTED]
---

 include/linux/init_task.h |   27 +++
 include/linux/pid.h   |2 ++
 kernel/pid.c  |2 ++
 3 files changed, 31 insertions(+)

Index: lx26-20-mm2c/include/linux/init_task.h
===
--- lx26-20-mm2c.orig/include/linux/init_task.h 2007-02-28 15:47:44.0 
-0800
+++ lx26-20-mm2c/include/linux/init_task.h  2007-02-28 15:48:07.0 
-0800
@@ -96,6 +96,28 @@ extern struct group_info init_groups;
 #define INIT_PREEMPT_RCU
 #endif
 
+#define INIT_STRUCT_PID {  \
+   .count  = ATOMIC_INIT(1),   \
+   .nr = 0,\
+   /* Don't put this struct pid in pid_hash */ \
+   .pid_chain  = { .next = NULL, .pprev = NULL },  \
+   .tasks  = { \
+   { .first = init_task.pids[PIDTYPE_PID].node }, \
+   { .first = init_task.pids[PIDTYPE_PGID].node },\
+   { .first = init_task.pids[PIDTYPE_SID].node }, \
+   },  \
+   .rcu= RCU_HEAD_INIT,\
+}
+
+#define INIT_PID_LINK(type)\
+{  \
+   .node = {   \
+   .next = NULL,   \
+   .pprev = init_struct_pid.tasks[type].first,\
+   },  \
+   .pid = init_struct_pid,\
+}
+
 /*
  *  INIT_TASK is used to set up the first task table, touch at
  * your own risk!. Base=0, limit=0x1f (=2MB)
@@ -145,6 +167,11 @@ extern struct group_info init_groups;
.cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers),  \
.fs_excl= ATOMIC_INIT(0),   \
.pi_lock= SPIN_LOCK_UNLOCKED,   \
+   .pids = {   \
+   [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),\
+   [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),   \
+   [PIDTYPE_SID]  = INIT_PID_LINK(PIDTYPE_SID),\
+   },  \
INIT_TRACE_IRQFLAGS \
INIT_LOCKDEP\
 }
Index: lx26-20-mm2c/include/linux/pid.h
===
--- lx26-20-mm2c.orig/include/linux/pid.h   2007-02-28 15:48:07.0 
-0800
+++ lx26-20-mm2c/include/linux/pid.h2007-02-28 15:48:07.0 -0800
@@ -51,6 +51,8 @@ struct pid
struct rcu_head rcu;
 };
 
+extern struct pid init_struct_pid;
+
 struct pid_link
 {
struct hlist_node node;
Index: lx26-20-mm2c/kernel/pid.c
===
--- lx26-20-mm2c.orig/kernel/pid.c  2007-02-28 15:48:07.0 -0800
+++ lx26-20-mm2c/kernel/pid.c   2007-02-28 15:48:07.0 -0800
@@ -27,11 +27,13 @@
 #include linux/bootmem.h
 #include linux/hash.h
 #include linux/pid_namespace.h
+#include linux/init_task.h
 
 #define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift)
 static struct hlist_head *pid_hash;
 static int pidhash_shift;
 static struct kmem_cache *pid_cachep;
+struct pid init_struct_pid = INIT_STRUCT_PID;
 
 int pid_max = PID_MAX_DEFAULT;
 
-
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[PATCH 1/5] statically initialize struct pid for swapper

[PATCH 1/5] statically initialize struct pid for swapper

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