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Date: Fri, 19 Jan 2007 20:00:07 -0800
From: Sukadev Bhattiprolu <sukadev@...ibm.com>
To: Andrew Morton <akpm@...l.org>
Cc: linux-kernel@...r.kernel.org,
Containers <containers@...ts.osdl.org>
Subject: [PATCH] Statically initialize struct pid for swapper
From: Sukadev Bhattiprolu <sukadev@...ibm.com>
Subject: [PATCH] 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 <sukadev@...ibm.com>
Cc: Cedric Le Goater <clg@...ibm.com>
Cc: Dave Hansen <haveblue@...ibm.com>
Cc: Serge Hallyn <serue@...ibm.com>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: containers@...ts.osdl.org
---
include/linux/init_task.h | 27 +++++++++++++++++++++++++++
include/linux/pid.h | 2 ++
kernel/pid.c | 2 ++
3 files changed, 31 insertions(+)
Index: lx26-20-rc4-mm1/include/linux/init_task.h
===================================================================
--- lx26-20-rc4-mm1.orig/include/linux/init_task.h 2007-01-19 19:13:35.161859112 -0800
+++ lx26-20-rc4-mm1/include/linux/init_task.h 2007-01-19 19:15:05.893065872 -0800
@@ -90,6 +90,28 @@ extern struct nsproxy init_nsproxy;
extern struct group_info init_groups;
+#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=0x1fffff (=2MB)
@@ -141,6 +163,11 @@ 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-rc4-mm1/kernel/pid.c
===================================================================
--- lx26-20-rc4-mm1.orig/kernel/pid.c 2007-01-19 19:13:35.162858960 -0800
+++ lx26-20-rc4-mm1/kernel/pid.c 2007-01-19 19:13:38.925286984 -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;
Index: lx26-20-rc4-mm1/include/linux/pid.h
===================================================================
--- lx26-20-rc4-mm1.orig/include/linux/pid.h 2007-01-19 19:13:35.161859112 -0800
+++ lx26-20-rc4-mm1/include/linux/pid.h 2007-01-19 19:13:38.925286984 -0800
@@ -51,6 +51,8 @@ struct pid
struct rcu_head rcu;
};
+extern struct pid init_struct_pid;
+
struct pid_link
{
struct hlist_node node;
-
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