From f7e4217b007d1f73e7e3cf10ba4fea4a608c603f Mon Sep 17 00:00:00 2001 From: Roman Zippel Date: Wed, 9 May 2007 02:35:17 -0700 Subject: [PATCH] rename thread_info to stack 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. Nonbroken archs which have a proper thread pointer can do the access to both current thread and task structure via a single pointer. It'll allow for a few more cleanups of the fork code, from which e.g. ia64 could benefit. Signed-off-by: Roman Zippel [akpm@linux-foundation.org: build fix] Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Russell King Cc: Ian Molton Cc: Haavard Skinnemoen Cc: Mikael Starvik Cc: David Howells Cc: Yoshinori Sato Cc: "Luck, Tony" Cc: Hirokazu Takata Cc: Geert Uytterhoeven Cc: Roman Zippel Cc: Greg Ungerer Cc: Ralf Baechle Cc: Ralf Baechle Cc: Paul Mackerras Cc: Benjamin Herrenschmidt Cc: Heiko Carstens Cc: Martin Schwidefsky Cc: Paul Mundt Cc: Kazumoto Kojima Cc: Richard Curnow Cc: William Lee Irwin III Cc: "David S. Miller" Cc: Jeff Dike Cc: Paolo 'Blaisorblade' Giarrusso Cc: Miles Bader Cc: Andi Kleen Cc: Chris Zankel Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/blackfin/kernel/ptrace.c | 6 +++--- 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-alpha/thread_info.h | 8 ++++---- include/asm-blackfin/processor.h | 6 +++--- include/asm-blackfin/system.h | 4 ++-- include/asm-m68k/thread_info.h | 6 +++--- include/asm-x86_64/system.h | 2 +- include/linux/init_task.h | 2 +- include/linux/sched.h | 8 ++++---- kernel/fork.c | 4 ++-- 19 files changed, 33 insertions(+), 33 deletions(-) diff --git a/arch/blackfin/kernel/ptrace.c b/arch/blackfin/kernel/ptrace.c index d7c8e514cb..e718bb4a1e 100644 --- a/arch/blackfin/kernel/ptrace.c +++ b/arch/blackfin/kernel/ptrace.c @@ -73,7 +73,7 @@ static inline struct pt_regs *get_user_regs(struct task_struct *task) { return (struct pt_regs *) - ((unsigned long)task->thread_info + + ((unsigned long)task_stack_page(task) + (THREAD_SIZE - sizeof(struct pt_regs))); } @@ -99,7 +99,7 @@ static inline long get_reg(struct task_struct *task, int regno) unsigned char *reg_ptr; struct pt_regs *regs = - (struct pt_regs *)((unsigned long)task->thread_info + + (struct pt_regs *)((unsigned long)task_stack_page(task) + (THREAD_SIZE - sizeof(struct pt_regs))); reg_ptr = (char *)regs; @@ -125,7 +125,7 @@ put_reg(struct task_struct *task, int regno, unsigned long data) char * reg_ptr; struct pt_regs *regs = - (struct pt_regs *)((unsigned long)task->thread_info + + (struct pt_regs *)((unsigned long)task_stack_page(task) + (THREAD_SIZE - sizeof(struct pt_regs))); reg_ptr = (char *)regs; diff --git a/arch/h8300/kernel/asm-offsets.c b/arch/h8300/kernel/asm-offsets.c index b78b82ad28..fc30b4fd09 100644 --- a/arch/h8300/kernel/asm-offsets.c +++ b/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)); diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c index 1d7cc7e2ce..f8ae709de0 100644 --- a/arch/ia64/kernel/mca.c +++ b/arch/ia64/kernel/mca.c @@ -1689,7 +1689,7 @@ format_mca_init_stack(void *mca_data, unsigned long offset, 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); diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c index 761a779d5c..3b27309d54 100644 --- a/arch/mips/kernel/asm-offsets.c +++ b/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); diff --git a/arch/parisc/kernel/asm-offsets.c b/arch/parisc/kernel/asm-offsets.c index 54fdb95914..d3b7917a87 100644 --- a/arch/parisc/kernel/asm-offsets.c +++ b/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)); diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 8f48560b7e..37bc35e69d 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/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 */ diff --git a/arch/ppc/kernel/asm-offsets.c b/arch/ppc/kernel/asm-offsets.c index c5850a2726..e8e94321b5 100644 --- a/arch/ppc/kernel/asm-offsets.c +++ b/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)); diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index ec514fe5cc..1375f8a446 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/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, diff --git a/arch/sparc/kernel/asm-offsets.c b/arch/sparc/kernel/asm-offsets.c index 29d7cfd1c9..6773ed76e4 100644 --- a/arch/sparc/kernel/asm-offsets.c +++ b/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)); diff --git a/arch/v850/kernel/asm-offsets.c b/arch/v850/kernel/asm-offsets.c index 24f2913690..cee5c3142d 100644 --- a/arch/v850/kernel/asm-offsets.c +++ b/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)); diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c index b256cfbef3..698079b3a3 100644 --- a/arch/xtensa/kernel/asm-offsets.c +++ b/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(); diff --git a/include/asm-alpha/thread_info.h b/include/asm-alpha/thread_info.h index eeb3bef91e..f4defc2bd3 100644 --- a/include/asm-alpha/thread_info.h +++ b/include/asm-alpha/thread_info.h @@ -97,7 +97,7 @@ register struct thread_info *__current_thread_info __asm__("$8"); 1 << TIF_UAC_SIGBUS) #define SET_UNALIGN_CTL(task,value) ({ \ - (task)->thread_info->flags = (((task)->thread_info->flags & \ + task_thread_info(task)->flags = ((task_thread_info(task)->flags & \ ~ALPHA_UAC_MASK) \ | (((value) << ALPHA_UAC_SHIFT) & (1<thread_info->flags & (1 << TIF_UAC_NOPRINT)) \ + put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\ >> ALPHA_UAC_SHIFT \ - | ((task)->thread_info->flags & (1 << TIF_UAC_SIGBUS)) \ + | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\ >> (ALPHA_UAC_SHIFT + 1) \ - | ((task)->thread_info->flags & (1 << TIF_UAC_NOFIX)) \ + | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\ >> (ALPHA_UAC_SHIFT - 1), \ (int __user *)(value)); \ }) diff --git a/include/asm-blackfin/processor.h b/include/asm-blackfin/processor.h index 997465c93e..0336ff132c 100644 --- a/include/asm-blackfin/processor.h +++ b/include/asm-blackfin/processor.h @@ -58,10 +58,10 @@ do { \ (_regs)->pc = (_pc); \ if (current->mm) \ (_regs)->p5 = current->mm->start_data; \ - current->thread_info->l1_task_info.stack_start \ + task_thread_info(current)->l1_task_info.stack_start \ = (void *)current->mm->context.stack_start; \ - current->thread_info->l1_task_info.lowest_sp = (void *)(_usp); \ - memcpy(L1_SCRATCH_TASK_INFO, ¤t->thread_info->l1_task_info, \ + task_thread_info(current)->l1_task_info.lowest_sp = (void *)(_usp); \ + memcpy(L1_SCRATCH_TASK_INFO, &task_thread_info(current)->l1_task_info, \ sizeof(*L1_SCRATCH_TASK_INFO)); \ wrusp(_usp); \ } while(0) diff --git a/include/asm-blackfin/system.h b/include/asm-blackfin/system.h index b5bf6e7cb5..5e5f1a0566 100644 --- a/include/asm-blackfin/system.h +++ b/include/asm-blackfin/system.h @@ -239,9 +239,9 @@ asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_stru #define switch_to(prev,next,last) \ do { \ - memcpy (&prev->thread_info->l1_task_info, L1_SCRATCH_TASK_INFO, \ + memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \ sizeof *L1_SCRATCH_TASK_INFO); \ - memcpy (L1_SCRATCH_TASK_INFO, &next->thread_info->l1_task_info, \ + memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \ sizeof *L1_SCRATCH_TASK_INFO); \ (last) = resume (prev, next); \ } while (0) diff --git a/include/asm-m68k/thread_info.h b/include/asm-m68k/thread_info.h index c4d622a57d..d635a37524 100644 --- a/include/asm-m68k/thread_info.h +++ b/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 diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h index b7b8021e8c..ead9f9a562 100644 --- a/include/asm-x86_64/system.h +++ b/include/asm-x86_64/system.h @@ -39,7 +39,7 @@ [threadrsp] "i" (offsetof(struct task_struct, thread.rsp)), \ [ti_flags] "i" (offsetof(struct thread_info, flags)),\ [tif_fork] "i" (TIF_FORK), \ - [thread_info] "i" (offsetof(struct task_struct, thread_info)), \ + [thread_info] "i" (offsetof(struct task_struct, stack)), \ [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)) \ : "memory", "cc" __EXTRA_CLOBBER) diff --git a/include/linux/init_task.h b/include/linux/init_task.h index 795102309b..45170b2fa2 100644 --- a/include/linux/init_task.h +++ b/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, \ diff --git a/include/linux/sched.h b/include/linux/sched.h index 28000b1658..17b72d88c4 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -817,7 +817,7 @@ 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 int flags; /* per process flags, defined below */ unsigned int ptrace; @@ -1513,8 +1513,8 @@ static inline void unlock_task_sighand(struct task_struct *tsk, #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) { @@ -1524,7 +1524,7 @@ static inline void setup_thread_stack(struct task_struct *p, struct task_struct 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 diff --git a/kernel/fork.c b/kernel/fork.c index a8dd75d499..5dd3979747 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -105,7 +105,7 @@ 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); } @@ -175,7 +175,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig) } *tsk = *orig; - tsk->thread_info = ti; + tsk->stack = ti; setup_thread_stack(tsk, orig); #ifdef CONFIG_CC_STACKPROTECTOR -- 2.39.5