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Message-ID: <20110406201350.GA9378@linux.vnet.ibm.com>
Date: Wed, 6 Apr 2011 13:13:50 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Lai Jiangshan <laijs@...fujitsu.com>,
Michal Marek <mmarek@...e.cz>,
"H. Peter Anvin" <hpa@...ux.intel.com>,
Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
Alexander van Heukelum <heukelum@...tmail.fm>,
Dipankar Sarma <dipankar@...ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Sam Ravnborg <sam@...nborg.org>,
David Howells <dhowells@...hat.com>,
Oleg Nesterov <oleg@...hat.com>,
Roland McGrath <roland@...hat.com>,
Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET
On Wed, Apr 06, 2011 at 12:21:19PM -0700, Paul E. McKenney wrote:
> On Wed, Apr 06, 2011 at 10:10:28AM +0200, Peter Zijlstra wrote:
> > On Tue, 2011-04-05 at 16:07 -0700, Paul E. McKenney wrote:
> > >
> > > The next layer on this onion is the use of the ctl_table typedef
> > > in include/linux/key.h -- which is defined to be struct ctl_table.
> > > Anyone know where struct ctl_table is defined? Color me blind, but I
> > > am not seeing it...
> >
> > include/linux/sysctl.h:1015
>
> Thank you!
And the following patch builds correctly for defconfig x86 builds,
while allowing rcupdate.h to see the sched.h definitions as needed
to inline rcu_read_lock() and rcu_read_unlock().
I will try allyesconfig builds and see what else breaks.
Thanx, Paul
include/linux/pid.h | 2 +-
include/linux/rcupdate.h | 27 +++++++++------------------
include/linux/rcutree.h | 2 ++
include/linux/sched.h | 10 ++++------
include/linux/sem.h | 2 +-
include/linux/sysctl.h | 5 +++--
include/linux/types.h | 10 ++++++++++
kernel/pid_namespace.c | 2 ++
8 files changed, 32 insertions(+), 28 deletions(-)
diff --git a/include/linux/pid.h b/include/linux/pid.h
index efceda0..3c5719b 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -1,7 +1,7 @@
#ifndef _LINUX_PID_H
#define _LINUX_PID_H
-#include <linux/rcupdate.h>
+#include <linux/types.h>
enum pid_type
{
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index ff422d2..2fe6402 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -33,6 +33,7 @@
#ifndef __LINUX_RCUPDATE_H
#define __LINUX_RCUPDATE_H
+#include <linux/types.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/threads.h>
@@ -52,16 +53,6 @@ extern int rcutorture_runnable; /* for sysctl */
#define ULONG_CMP_GE(a, b) (ULONG_MAX / 2 >= (a) - (b))
#define ULONG_CMP_LT(a, b) (ULONG_MAX / 2 < (a) - (b))
-/**
- * struct rcu_head - callback structure for use with RCU
- * @next: next update requests in a list
- * @func: actual update function to call after the grace period.
- */
-struct rcu_head {
- struct rcu_head *next;
- void (*func)(struct rcu_head *head);
-};
-
/* Exported common interfaces */
extern void call_rcu_sched(struct rcu_head *head,
void (*func)(struct rcu_head *rcu));
@@ -141,14 +132,6 @@ static inline void rcu_exit_nohz(void)
#endif /* #else #ifdef CONFIG_NO_HZ */
-#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
-#include <linux/rcutree.h>
-#elif defined(CONFIG_TINY_RCU) || defined(CONFIG_TINY_PREEMPT_RCU)
-#include <linux/rcutiny.h>
-#else
-#error "Unknown RCU implementation specified to kernel configuration"
-#endif
-
/*
* init_rcu_head_on_stack()/destroy_rcu_head_on_stack() are needed for dynamic
* initialization and destruction of rcu_head on the stack. rcu_head structures
@@ -797,4 +780,12 @@ static inline void debug_rcu_head_unqueue(struct rcu_head *head)
}
#endif /* #else !CONFIG_DEBUG_OBJECTS_RCU_HEAD */
+#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
+#include <linux/rcutree.h>
+#elif defined(CONFIG_TINY_RCU) || defined(CONFIG_TINY_PREEMPT_RCU)
+#include <linux/rcutiny.h>
+#else
+#error "Unknown RCU implementation specified to kernel configuration"
+#endif
+
#endif /* __LINUX_RCUPDATE_H */
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 3a93348..c317eec 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -30,6 +30,8 @@
#ifndef __LINUX_RCUTREE_H
#define __LINUX_RCUTREE_H
+#include <linux/sched.h>
+
extern void rcu_init(void);
extern void rcu_note_context_switch(int cpu);
extern int rcu_needs_cpu(int cpu);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 83bd2e2..30a4444 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -78,7 +78,7 @@ struct sched_param {
#include <linux/topology.h>
#include <linux/proportions.h>
#include <linux/seccomp.h>
-#include <linux/rcupdate.h>
+#include <linux/types.h>
#include <linux/rculist.h>
#include <linux/rtmutex.h>
@@ -2241,11 +2241,9 @@ int same_thread_group(struct task_struct *p1, struct task_struct *p2)
return p1->tgid == p2->tgid;
}
-static inline struct task_struct *next_thread(const struct task_struct *p)
-{
- return list_entry_rcu(p->thread_group.next,
- struct task_struct, thread_group);
-}
+/* Avoid #include hell for inlining rcu_read_lock(). */
+#define next_thread(p) \
+ list_entry_rcu((p)->thread_group.next, struct task_struct, thread_group)
static inline int thread_group_empty(struct task_struct *p)
{
diff --git a/include/linux/sem.h b/include/linux/sem.h
index f2961af..8489a1f 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -78,7 +78,7 @@ struct seminfo {
#ifdef __KERNEL__
#include <asm/atomic.h>
-#include <linux/rcupdate.h>
+#include <linux/types.h>
#include <linux/cache.h>
struct task_struct;
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 11684d9..be80a59 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -19,6 +19,8 @@
****************************************************************
*/
+#include <linux/key.h>
+
#ifndef _LINUX_SYSCTL_H
#define _LINUX_SYSCTL_H
@@ -1012,8 +1014,7 @@ extern int proc_do_large_bitmap(struct ctl_table *, int,
*/
/* A sysctl table is an array of struct ctl_table: */
-struct ctl_table
-{
+struct ctl_table {
const char *procname; /* Text ID for /proc/sys, or zero */
void *data;
int maxlen;
diff --git a/include/linux/types.h b/include/linux/types.h
index 176da8c..868ef8b 100644
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -231,6 +231,16 @@ struct hlist_node {
struct hlist_node *next, **pprev;
};
+/**
+ * struct rcu_head - callback structure for use with RCU
+ * @next: next update requests in a list
+ * @func: actual update function to call after the grace period.
+ */
+struct rcu_head {
+ struct rcu_head *next;
+ void (*func)(struct rcu_head *head);
+};
+
struct ustat {
__kernel_daddr_t f_tfree;
__kernel_ino_t f_tinode;
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index e9c9adc..bfa75df 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -8,6 +8,8 @@
*
*/
+#include <linux/types.h>
+#include <asm/atomic.h>
#include <linux/pid.h>
#include <linux/pid_namespace.h>
#include <linux/syscalls.h>
--
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