Hi,
On Thu, 11 Jan 2007, Geert Uytterhoeven wrote:
Hmm, upon closer look, there are more conflicts between
<asm/asm-offsets.h> and other header files, and
arch/m68k/kernel/ptrace.c does need some of the PT_* definitions from
<asm/ptrace.h>, so I can't just kill them. I guess I'll have to rename the
conflicting ones in asm-offsets.
First patch (still fails to build the whole tree) below.
Below is an alternative approach (which at least compiles :) ), which
avoids any direct or indirect dependency on task structure information.
Only the init_task definition is a little ugly as there is currently no
way to get the task_struct without pulling all of sched.h
bye, Roman
---
arch/m68k/kernel/asm-offsets.c | 2 +-
arch/m68k/kernel/head.S | 2 +-
arch/m68k/kernel/process.c | 18 ++++++++++++++----
include/asm-ia64/thread_info.h | 1 +
include/asm-m68k/thread_info.h | 14 +++++++++++++-
include/asm-m68k/processor.h | 3 ---
include/linux/sched.h | 12 +++++++-----
kernel/fork.c | 2 ++
8 files changed, 39 insertions(+), 15 deletions(-)
Index: linux-2.6/arch/m68k/kernel/asm-offsets.c
===================================================================
--- linux-2.6.orig/arch/m68k/kernel/asm-offsets.c
+++ linux-2.6/arch/m68k/kernel/asm-offsets.c
@@ -26,7 +26,7 @@ int main(void)
DEFINE(TASK_FLAGS, offsetof(struct task_struct, flags));
DEFINE(TASK_PTRACE, offsetof(struct task_struct, ptrace));
DEFINE(TASK_THREAD, offsetof(struct task_struct, thread));
- DEFINE(TASK_INFO, offsetof(struct task_struct, thread.info));
+ DEFINE(TASK_INFO, -sizeof(struct thread_info));
DEFINE(TASK_MM, offsetof(struct task_struct, mm));
DEFINE(TASK_ACTIVE_MM, offsetof(struct task_struct, active_mm));
Index: linux-2.6/arch/m68k/kernel/head.S
===================================================================
--- linux-2.6.orig/arch/m68k/kernel/head.S
+++ linux-2.6/arch/m68k/kernel/head.S
@@ -1520,7 +1520,7 @@ L(cache_done):
/*
* Setup initial stack pointer
*/
- lea init_task,%curptr
+ lea init_m68k_task-TASK_INFO,%curptr
lea init_thread_union+THREAD_SIZE,%sp
putc 'K'
Index: linux-2.6/arch/m68k/kernel/process.c
===================================================================
--- linux-2.6.orig/arch/m68k/kernel/process.c
+++ linux-2.6/arch/m68k/kernel/process.c
@@ -48,14 +48,24 @@ struct mm_struct init_mm = INIT_MM(init_
EXPORT_SYMBOL(init_mm);
-union thread_union init_thread_union
+union thread_union {
+ struct task_struct *task;
+ unsigned char stack[THREAD_SIZE];
+} init_thread_union
__attribute__((section(".data.init_task"), aligned(THREAD_SIZE)))
- = { INIT_THREAD_INFO(init_task) };
+ = { .task = &init_task };
/* initial task structure */
-struct task_struct init_task = INIT_TASK(init_task);
+struct m68k_task {
+ struct thread_info info;
+ struct task_struct task;
+} init_m68k_task = {
+ .info = INIT_THREAD_INFO(init_task),
+ .task = INIT_TASK(init_task),
+};
+EXPORT_SYMBOL(init_m68k_task);
-EXPORT_SYMBOL(init_task);
+struct kmem_cache *task_struct_cachep;
asmlinkage void ret_from_fork(void);
Index: linux-2.6/include/asm-ia64/thread_info.h
===================================================================
--- linux-2.6.orig/include/asm-ia64/thread_info.h
+++ linux-2.6/include/asm-ia64/thread_info.h
@@ -68,6 +68,7 @@ struct thread_info {
#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
+#define setup_task_alloc() ((void)0)
#define alloc_task_struct() ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
#define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
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
@@ -36,7 +36,7 @@ struct thread_info {
#define init_thread_info (init_task.thread.info)
#define init_stack (init_thread_union.stack)
-#define task_thread_info(tsk) (&(tsk)->thread.info)
+#define task_thread_info(tsk) ((struct thread_info *)(tsk) - 1)
#define task_stack_page(tsk) ((void *)(tsk)->stack)
#define current_thread_info() task_thread_info(current)
@@ -49,6 +49,18 @@ struct thread_info {
#define end_of_stack(p) ((unsigned long *)(p)->thread_info + 1)
+#define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
+#define setup_task_alloc() (task_struct_cachep = kmem_cache_create("task_struct", \
+ sizeof(struct task_struct) + sizeof(struct thread_info), \
+ L1_CACHE_BYTES, SLAB_PANIC, NULL, NULL))
+#define alloc_task_struct() kmem_cache_alloc(task_struct_cachep, GFP_KERNEL)
+#define free_task_struct(tsk) kmem_cache_free(task_struct_cachep, (tsk))
+
+#define init_task (*(struct task_struct *)(((struct thread_info *)&init_m68k_task) + 1))
+
+extern struct kmem_cache *task_struct_cachep;
+extern struct m68k_task init_m68k_task;
+
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
* bits 8-15 are also tested at syscall exit
Index: linux-2.6/include/asm-m68k/processor.h
===================================================================
--- linux-2.6.orig/include/asm-m68k/processor.h
+++ linux-2.6/include/asm-m68k/processor.h
@@ -13,7 +13,6 @@
*/
#define current_text_addr() ({ __label__ _l; _l: &&_l;})
-#include <linux/thread_info.h>
#include <asm/segment.h>
#include <asm/fpu.h>
#include <asm/ptrace.h>
@@ -67,14 +66,12 @@ struct thread_struct {
unsigned long fp[8*3];
unsigned long fpcntl[3]; /* fp control regs */
unsigned char fpstate[FPSTATESIZE]; /* floating point state */
- struct thread_info info;
};
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
.sr = PS_S, \
.fs = __KERNEL_DS, \
- .info = INIT_THREAD_INFO(init_task), \
}
/*
Index: linux-2.6/include/linux/sched.h
===================================================================
--- linux-2.6.orig/include/linux/sched.h
+++ linux-2.6/include/linux/sched.h
@@ -1202,11 +1202,6 @@ void yield(void);
*/
extern struct exec_domain default_exec_domain;
-union thread_union {
- struct thread_info thread_info;
- unsigned long stack[THREAD_SIZE/sizeof(long)];
-};
-
#ifndef __HAVE_ARCH_KSTACK_END
static inline int kstack_end(void *addr)
{
@@ -1217,8 +1212,15 @@ static inline int kstack_end(void *addr)
}
#endif
+#ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
+union thread_union {
+ struct thread_info thread_info;
+ unsigned long stack[THREAD_SIZE/sizeof(long)];
+};
+
extern union thread_union init_thread_union;
extern struct task_struct init_task;
+#endif
extern struct mm_struct init_mm;
Index: linux-2.6/kernel/fork.c
===================================================================
--- linux-2.6.orig/kernel/fork.c
+++ linux-2.6/kernel/fork.c
@@ -136,6 +136,8 @@ void __init fork_init(unsigned long memp
task_struct_cachep =
kmem_cache_create("task_struct", sizeof(struct task_struct),
ARCH_MIN_TASKALIGN, SLAB_PANIC, NULL, NULL);
+#else
+ setup_task_alloc();
#endif
/*
-
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