[PATCH 2/2] rename thread_info to stack

From: Roman Zippel
Date: Mon Apr 30 2007 - 20:11:42 EST

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This finally renames the thread_info field in task structure to stack,
so that the assumptions about this field are gone and archs have more
freedom about placing the thread_info structure.

Signed-off-by: Roman Zippel <zippel@xxxxxxxxxxxxxx>

---
arch/h8300/kernel/asm-offsets.c | 2 +-
arch/ia64/kernel/mca.c | 2 +-
arch/mips/kernel/asm-offsets.c | 2 +-
arch/parisc/kernel/asm-offsets.c | 2 +-
arch/powerpc/kernel/asm-offsets.c | 2 +-
arch/ppc/kernel/asm-offsets.c | 2 +-
arch/s390/kernel/asm-offsets.c | 2 +-
arch/sparc/kernel/asm-offsets.c | 2 +-
arch/v850/kernel/asm-offsets.c | 2 +-
arch/xtensa/kernel/asm-offsets.c | 2 +-
include/asm-m68k/thread_info.h | 6 +++---
include/linux/init_task.h | 2 +-
include/linux/sched.h | 8 ++++----
kernel/fork.c | 4 ++--
14 files changed, 20 insertions(+), 20 deletions(-)

Index: linux-2.6/arch/ia64/kernel/mca.c
===================================================================
--- linux-2.6.orig/arch/ia64/kernel/mca.c
+++ linux-2.6/arch/ia64/kernel/mca.c
@@ -1690,7 +1690,7 @@ format_mca_init_stack(void *mca_data, un
ti->preempt_count = 1;
ti->task = p;
ti->cpu = cpu;
- p->thread_info = ti;
+ p->stack = ti;
p->state = TASK_UNINTERRUPTIBLE;
cpu_set(cpu, p->cpus_allowed);
INIT_LIST_HEAD(&p->tasks);
Index: linux-2.6/include/asm-m68k/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-m68k/thread_info.h
+++ linux-2.6/include/asm-m68k/thread_info.h
@@ -37,17 +37,17 @@ struct thread_info {
#define init_stack (init_thread_union.stack)

#define task_thread_info(tsk) (&(tsk)->thread.info)
-#define task_stack_page(tsk) ((void *)(tsk)->thread_info)
+#define task_stack_page(tsk) ((tsk)->stack)
#define current_thread_info() task_thread_info(current)

#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
Index: linux-2.6/include/linux/init_task.h
===================================================================
--- linux-2.6.orig/include/linux/init_task.h
+++ linux-2.6/include/linux/init_task.h
@@ -95,7 +95,7 @@ extern struct group_info init_groups;
#define INIT_TASK(tsk) \
{ \
.state = 0, \
- .thread_info = &init_thread_info, \
+ .stack = &init_thread_info, \
.usage = ATOMIC_INIT(2), \
.flags = 0, \
.lock_depth = -1, \
Index: linux-2.6/include/linux/sched.h
===================================================================
--- linux-2.6.orig/include/linux/sched.h
+++ linux-2.6/include/linux/sched.h
@@ -799,7 +799,7 @@ struct prio_array;

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;
@@ -1494,8 +1494,8 @@ static inline void unlock_task_sighand(s

#ifndef __HAVE_THREAD_FUNCTIONS

-#define task_thread_info(task) (task)->thread_info
-#define task_stack_page(task) ((void*)((task)->thread_info))
+#define task_thread_info(task) ((struct thread_info *)(task)->stack)
+#define task_stack_page(task) ((task)->stack)

static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
{
@@ -1505,7 +1505,7 @@ 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/kernel/fork.c
===================================================================
--- linux-2.6.orig/kernel/fork.c
+++ linux-2.6/kernel/fork.c
@@ -106,7 +106,7 @@ static struct kmem_cache *mm_cachep;

void free_task(struct task_struct *tsk)
{
- free_thread_info(tsk->thread_info);
+ free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
free_task_struct(tsk);
}
@@ -176,7 +176,7 @@ static struct task_struct *dup_task_stru
}

*tsk = *orig;
- tsk->thread_info = ti;
+ tsk->stack = ti;
setup_thread_stack(tsk, orig);

#ifdef CONFIG_CC_STACKPROTECTOR
Index: linux-2.6/arch/h8300/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/h8300/kernel/asm-offsets.c
+++ linux-2.6/arch/h8300/kernel/asm-offsets.c
@@ -30,7 +30,7 @@ int main(void)
DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
- DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, thread_info));
+ DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
DEFINE(TASK_MM, offsetof(struct task_struct, mm));
DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));

Index: linux-2.6/arch/mips/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/mips/kernel/asm-offsets.c
+++ linux-2.6/arch/mips/kernel/asm-offsets.c
@@ -82,7 +82,7 @@ void output_task_defines(void)
{
text("/* MIPS task_struct offsets. */");
offset("#define TASK_STATE ", struct task_struct, state);
- offset("#define TASK_THREAD_INFO ", struct task_struct, thread_info);
+ offset("#define TASK_THREAD_INFO ", struct task_struct, stack);
offset("#define TASK_FLAGS ", struct task_struct, flags);
offset("#define TASK_MM ", struct task_struct, mm);
offset("#define TASK_PID ", struct task_struct, pid);
Index: linux-2.6/arch/parisc/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/parisc/kernel/asm-offsets.c
+++ linux-2.6/arch/parisc/kernel/asm-offsets.c
@@ -54,7 +54,7 @@

int main(void)
{
- DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, thread_info));
+ DEFINE(TASK_THREAD_INFO, offsetof(struct task_struct, stack));
DEFINE(TASK_STATE, offsetof(struct task_struct, state));
DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
DEFINE(TASK_SIGPENDING, offsetof(struct task_struct, pending));
Index: linux-2.6/arch/powerpc/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/powerpc/kernel/asm-offsets.c
+++ linux-2.6/arch/powerpc/kernel/asm-offsets.c
@@ -58,7 +58,7 @@ int main(void)
#ifdef CONFIG_PPC64
DEFINE(AUDITCONTEXT, offsetof(struct task_struct, audit_context));
#else
- DEFINE(THREAD_INFO, offsetof(struct task_struct, thread_info));
+ DEFINE(THREAD_INFO, offsetof(struct task_struct, stack));
DEFINE(PTRACE, offsetof(struct task_struct, ptrace));
#endif /* CONFIG_PPC64 */

Index: linux-2.6/arch/ppc/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/ppc/kernel/asm-offsets.c
+++ linux-2.6/arch/ppc/kernel/asm-offsets.c
@@ -35,7 +35,7 @@ int
main(void)
{
DEFINE(THREAD, offsetof(struct task_struct, thread));
- DEFINE(THREAD_INFO, offsetof(struct task_struct, thread_info));
+ DEFINE(THREAD_INFO, offsetof(struct task_struct, stack));
DEFINE(MM, offsetof(struct task_struct, mm));
DEFINE(PTRACE, offsetof(struct task_struct, ptrace));
DEFINE(KSP, offsetof(struct thread_struct, ksp));
Index: linux-2.6/arch/s390/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/s390/kernel/asm-offsets.c
+++ linux-2.6/arch/s390/kernel/asm-offsets.c
@@ -15,7 +15,7 @@

int main(void)
{
- DEFINE(__THREAD_info, offsetof(struct task_struct, thread_info),);
+ DEFINE(__THREAD_info, offsetof(struct task_struct, stack),);
DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp),);
DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info),);
DEFINE(__THREAD_mm_segment,
Index: linux-2.6/arch/sparc/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/sparc/kernel/asm-offsets.c
+++ linux-2.6/arch/sparc/kernel/asm-offsets.c
@@ -28,7 +28,7 @@ int foo(void)
DEFINE(AOFF_task_gid, offsetof(struct task_struct, gid));
DEFINE(AOFF_task_euid, offsetof(struct task_struct, euid));
DEFINE(AOFF_task_egid, offsetof(struct task_struct, egid));
- /* DEFINE(THREAD_INFO, offsetof(struct task_struct, thread_info)); */
+ /* DEFINE(THREAD_INFO, offsetof(struct task_struct, stack)); */
DEFINE(ASIZ_task_uid, sizeof(current->uid));
DEFINE(ASIZ_task_gid, sizeof(current->gid));
DEFINE(ASIZ_task_euid, sizeof(current->euid));
Index: linux-2.6/arch/v850/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/v850/kernel/asm-offsets.c
+++ linux-2.6/arch/v850/kernel/asm-offsets.c
@@ -29,7 +29,7 @@ int main (void)
DEFINE (TASK_PTRACE, offsetof (struct task_struct, ptrace));
DEFINE (TASK_BLOCKED, offsetof (struct task_struct, blocked));
DEFINE (TASK_THREAD, offsetof (struct task_struct, thread));
- DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, thread_info));
+ DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, stack));
DEFINE (TASK_MM, offsetof (struct task_struct, mm));
DEFINE (TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
DEFINE (TASK_PID, offsetof (struct task_struct, pid));
Index: linux-2.6/arch/xtensa/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/xtensa/kernel/asm-offsets.c
+++ linux-2.6/arch/xtensa/kernel/asm-offsets.c
@@ -70,7 +70,7 @@ int main(void)
DEFINE(TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
DEFINE(TASK_PID, offsetof (struct task_struct, pid));
DEFINE(TASK_THREAD, offsetof (struct task_struct, thread));
- DEFINE(TASK_THREAD_INFO, offsetof (struct task_struct, thread_info));
+ DEFINE(TASK_THREAD_INFO, offsetof (struct task_struct, stack));
DEFINE(TASK_STRUCT_SIZE, sizeof (struct task_struct));
BLANK();

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Next message: Mark Lord: "Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ,CONFIG_HIGH_RES_TIMERS"
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