This adds a new field stack to task_struct. Its value is identical to thread_info,
but on m68k it doesn't point to the thread_info. This allows to convert direct accesses
to the thread_info field to either convert to using the stack field, end_of_stack()
or task_thread_info().
Signed-off-by: Roman Zippel <[email protected]>
---
include/asm-m68k/thread_info.h | 4 ++--
include/linux/init_task.h | 1 +
include/linux/sched.h | 5 +++--
kernel/fork.c | 1 +
4 files changed, 7 insertions(+), 4 deletions(-)
Index: linux-2.6-mm/include/linux/sched.h
===================================================================
--- linux-2.6-mm.orig/include/linux/sched.h 2005-09-01 21:04:33.241207651 +0200
+++ linux-2.6-mm/include/linux/sched.h 2005-09-01 21:04:41.963708999 +0200
@@ -662,6 +662,7 @@ struct mempolicy;
struct task_struct {
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
struct thread_info *thread_info;
+ void *stack;
atomic_t usage;
unsigned long flags; /* per process flags, defined below */
unsigned long ptrace;
@@ -1211,7 +1212,7 @@ static inline void task_unlock(struct ta
#ifndef __HAVE_THREAD_FUNCTIONS
-#define task_thread_info(task) (task)->thread_info
+#define task_thread_info(task) ((struct thread_info *)(task)->stack)
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
{
@@ -1221,7 +1222,7 @@ static inline void setup_thread_stack(st
static inline unsigned long *end_of_stack(struct task_struct *p)
{
- return (unsigned long *)(p->thread_info + 1);
+ return (unsigned long *)(task_thread_info(p) + 1);
}
#endif
Index: linux-2.6-mm/include/linux/init_task.h
===================================================================
--- linux-2.6-mm.orig/include/linux/init_task.h 2005-09-01 13:21:50.000000000 +0200
+++ linux-2.6-mm/include/linux/init_task.h 2005-09-01 21:04:41.987704876 +0200
@@ -81,6 +81,7 @@ extern struct group_info init_groups;
{ \
.state = 0, \
.thread_info = &init_thread_info, \
+ .stack = &init_stack, \
.usage = ATOMIC_INIT(2), \
.flags = 0, \
.lock_depth = -1, \
Index: linux-2.6-mm/kernel/fork.c
===================================================================
--- linux-2.6-mm.orig/kernel/fork.c 2005-09-01 21:04:28.638998406 +0200
+++ linux-2.6-mm/kernel/fork.c 2005-09-01 21:04:41.988704704 +0200
@@ -172,6 +172,7 @@ static struct task_struct *dup_task_stru
*tsk = *orig;
tsk->thread_info = ti;
+ tsk->stack = ti;
setup_thread_stack(tsk, orig);
/* One for us, one for whoever does the "release_task()" (usually parent) */
Index: linux-2.6-mm/include/asm-m68k/thread_info.h
===================================================================
--- linux-2.6-mm.orig/include/asm-m68k/thread_info.h 2005-09-01 21:04:39.711096024 +0200
+++ linux-2.6-mm/include/asm-m68k/thread_info.h 2005-09-01 21:04:41.988704704 +0200
@@ -42,11 +42,11 @@ struct thread_info {
#define __HAVE_THREAD_FUNCTIONS
#define setup_thread_stack(p, org) ({ \
- *(struct task_struct **)(p)->thread_info = (p); \
+ *(struct task_struct **)(p)->stack = (p); \
task_thread_info(p)->task = (p); \
})
-#define end_of_stack(p) ((unsigned long *)(p)->thread_info + 1)
+#define end_of_stack(p) ((unsigned long *)(p)->stack + 1)
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
-
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