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m68k: remove thread_info struct from thread struct

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Currently on m68k we have a comeplete thread_info structure stored inside
of the thread_struct, and we also have it in the initial part of the kernel
stack. Mostly the code currently uses the one inside of the thread_struct,
only using the "task" pointer from the stack based one.

This is wasteful and confusing, we should only have the single instance of
thread_info inside the stack page. And this is the norm for all other
architectures.

This change makes m68k handle thread_info consistently on both MMU enabled
and non-MMU setups.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer
2011-09-02 14:29:34 +10:00
parent 8d362b0dea
commit d25ba98afc
4 changed files with 22 additions and 43 deletions
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2
arch/m68k/include/asm/processor.h
View File

@@ -88,14 +88,12 @@ 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), \
}
#ifdef CONFIG_MMU

30
arch/m68k/include/asm/thread_info.h
View File

@@ -47,34 +47,6 @@ struct thread_info {
#define init_stack (init_thread_union.stack)
#ifdef CONFIG_MMU
#ifndef __ASSEMBLY__
#include <asm/current.h>
#endif
#ifdef ASM_OFFSETS_C
#define task_thread_info(tsk) ((struct thread_info *) NULL)
#else
#include <asm/asm-offsets.h>
#define task_thread_info(tsk) ((struct thread_info *)((char *)tsk+TASK_INFO))
#endif
#define init_thread_info (init_task.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)->stack = (p); \
task_thread_info(p)->task = (p); \
})
#define end_of_stack(p) ((unsigned long *)(p)->stack + 1)
#else /* !CONFIG_MMU */
#ifndef __ASSEMBLY__
/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
@@ -92,8 +64,6 @@ static inline struct thread_info *current_thread_info(void)
#define init_thread_info (init_thread_union.thread_info)
#endif /* CONFIG_MMU */
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
* bits 8-15 are also tested at syscall exit