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 <zippel@linux-m68k.org>
[akpm@linux-foundation.org: build fix]
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Andi Kleen <ak@muc.de>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-alpha/thread_info.h b/include/asm-alpha/thread_info.h
index eeb3bef..f4defc2 100644
--- a/include/asm-alpha/thread_info.h
+++ b/include/asm-alpha/thread_info.h
@@ -97,7 +97,7 @@
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<<TIF_UAC_NOPRINT))\
| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
@@ -105,11 +105,11 @@
0; })
#define GET_UNALIGN_CTL(task,value) ({ \
- put_user(((task)->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 997465c..0336ff1 100644
--- a/include/asm-blackfin/processor.h
+++ b/include/asm-blackfin/processor.h
@@ -58,10 +58,10 @@
(_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 b5bf6e7..5e5f1a0 100644
--- a/include/asm-blackfin/system.h
+++ b/include/asm-blackfin/system.h
@@ -239,9 +239,9 @@
#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 c4d622a..d635a37 100644
--- a/include/asm-m68k/thread_info.h
+++ b/include/asm-m68k/thread_info.h
@@ -37,17 +37,17 @@
#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 b7b8021..ead9f9a 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 7951023..45170b2 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -95,7 +95,7 @@
#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 28000b1..17b72d8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -817,7 +817,7 @@
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 @@
#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 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