[Devel] [RFC][PATCH 05/14] Initialize struct pid_nr for swapper

[sukadev at us.ibm.com]

From: Sukadev Bhattiprolu <sukadev at us.ibm.com>
Subject: [RFC][PATCH 05/14] Initialize struct pid_nr for swapper.

Statically initialize a struct pid_nr for the swapper process.

Signed-off-by: Sukadev Bhattiprolu <sukadev at us.ibm.com>
---
 include/linux/init_task.h |   10 ++++++++++
 kernel/pid.c              |    1 +
 2 files changed, 11 insertions(+)

Index: 2.6.21-rc3-mm2/include/linux/init_task.h
===================================================================
--- 2.6.21-rc3-mm2.orig/include/linux/init_task.h
+++ 2.6.21-rc3-mm2/include/linux/init_task.h
@@ -96,6 +96,15 @@ extern struct group_info init_groups;
 #define INIT_PREEMPT_RCU
 #endif

+#define INIT_STRUCT_PID_NR {						\
+	.node		= { .next = NULL, .pprev = NULL },		\
+	.nr		= 0,						\
+	/* Don't put this struct pid in pid_hash */			\
+	.pid_chain	= { .next = NULL, .pprev = NULL },		\
+	.pid_ns		= &init_pid_ns,					\
+	.pid		= &init_struct_pid,				\
+}
+
 #define INIT_STRUCT_PID {						\
 	.count 		= ATOMIC_INIT(1),				\
 	.nr		= 0, 						\
@@ -106,6 +115,7 @@ extern struct group_info init_groups;
 		{ .first = &init_task.pids[PIDTYPE_PGID].node },	\
 		{ .first = &init_task.pids[PIDTYPE_SID].node },		\
 	},								\
+	.pid_nrs	= { .first = &init_struct_pid_nr.node },	\
 	.rcu		= RCU_HEAD_INIT,				\
 }

Index: 2.6.21-rc3-mm2/kernel/pid.c
===================================================================
--- 2.6.21-rc3-mm2.orig/kernel/pid.c
+++ 2.6.21-rc3-mm2/kernel/pid.c
@@ -34,6 +34,7 @@ static struct hlist_head *pid_hash;
 static int pidhash_shift;
 static struct kmem_cache *pid_cachep;
 static struct kmem_cache *pid_nr_cachep;
+struct pid_nr init_struct_pid_nr = INIT_STRUCT_PID_NR;
 struct pid init_struct_pid = INIT_STRUCT_PID;

 int pid_max = PID_MAX_DEFAULT;

-- 

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