5 files changed, 19 insertions, 17 deletions

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 171b3e811c71..4733877296d4 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -19,6 +19,7 @@
 #include <asm/procinfo.h>
 #include <asm/ptrace.h>
 #include <asm/constants.h>
+#include <asm/thread_info.h>
 #include <asm/system.h>
 
 #define PROCINFO_MMUFLAGS       8
@@ -131,7 +132,7 @@ __switch_data:
         .long   processor_id                    @ r4
         .long   __machine_arch_type             @ r5
         .long   cr_alignment                    @ r6
-        .long   init_thread_union+8192          @ sp
+        .long   init_thread_union + THREAD_START_SP @ sp
 
 /*
  * The following fragment of code is executed with the MMU on, and uses
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 26eacd3e5def..8f146a4b4752 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -256,8 +256,6 @@ static unsigned long *thread_info_head;
 static unsigned int nr_thread_info;
 
 #define EXTRA_TASK_STRUCT       4
-#define ll_alloc_task_struct() ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
-#define ll_free_task_struct(p) free_pages((unsigned long)(p),1)
 
 struct thread_info *alloc_thread_info(struct task_struct *task)
 {
@@ -274,17 +272,16 @@ struct thread_info *alloc_thread_info(struct task_struct *task)
         }
 
         if (!thread)
-                thread = ll_alloc_task_struct();
+                thread = (struct thread_info *)
+                           __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
 
-#ifdef CONFIG_MAGIC_SYSRQ
+#ifdef CONFIG_DEBUG_STACK_USAGE
         /*
          * The stack must be cleared if you want SYSRQ-T to
          * give sensible stack usage information
          */
-        if (thread) {
-                char *p = (char *)thread;
-                memzero(p+KERNEL_STACK_SIZE, KERNEL_STACK_SIZE);
-        }
+        if (thread)
+                memzero(thread, THREAD_SIZE);
 #endif
         return thread;
 }
@@ -297,7 +294,7 @@ void free_thread_info(struct thread_info *thread)
                 thread_info_head = p;
                 nr_thread_info += 1;
         } else
-                ll_free_task_struct(thread);
+                free_pages((unsigned long)thread, THREAD_SIZE_ORDER);
 }
 
 /*
@@ -350,7 +347,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long stack_start,
         struct thread_info *thread = p->thread_info;
         struct pt_regs *childregs;
 
-        childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_SIZE - 8)) - 1;
+        childregs = ((struct pt_regs *)((unsigned long)thread + THREAD_START_SP)) - 1;
         *childregs = *regs;
         childregs->ARM_r0 = 0;
         childregs->ARM_sp = stack_start;
@@ -447,15 +444,17 @@ EXPORT_SYMBOL(kernel_thread);
 unsigned long get_wchan(struct task_struct *p)
 {
         unsigned long fp, lr;
-        unsigned long stack_page;
+        unsigned long stack_start, stack_end;
         int count = 0;
         if (!p || p == current || p->state == TASK_RUNNING)
                 return 0;
 
-        stack_page = 4096 + (unsigned long)p->thread_info;
+        stack_start = (unsigned long)(p->thread_info + 1);
+        stack_end = ((unsigned long)p->thread_info) + THREAD_SIZE;
+
         fp = thread_saved_fp(p);
         do {
-                if (fp < stack_page || fp > 4092+stack_page)
+                if (fp < stack_start || fp > stack_end)
                         return 0;
                 lr = pc_pointer (((unsigned long *)fp)[-1]);
                 if (!in_sched_functions(lr))
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index ef32577da304..f897ce2ccf0d 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -302,7 +302,7 @@ long execve(const char *filename, char **argv, char **envp)
                 "b      ret_to_user"
                 :
                 : "r" (current_thread_info()),
-                  "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
+                  "Ir" (THREAD_START_SP - sizeof(regs)),
                   "r" (&regs),
                   "Ir" (sizeof(regs))
                 : "r0", "r1", "r2", "r3", "ip", "memory");
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 3a001fe5540b..8988c02119fd 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -218,7 +218,8 @@ NORET_TYPE void die(const char *str, struct pt_regs *regs, int err)
                 tsk->comm, tsk->pid, tsk->thread_info + 1);
 
         if (!user_mode(regs) || in_interrupt()) {
-                dump_mem("Stack: ", regs->ARM_sp, 8192+(unsigned long)tsk->thread_info);
+                dump_mem("Stack: ", regs->ARM_sp,
+                         THREAD_SIZE + (unsigned long)tsk->thread_info);
                 dump_backtrace(regs, tsk);
                 dump_instr(regs);
         }
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index a39c6a42d68a..ad2d66c93a5c 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -5,6 +5,7 @@
 
 #include <asm-generic/vmlinux.lds.h>
 #include <linux/config.h>
+#include <asm/thread_info.h>
         
 OUTPUT_ARCH(arm)
 ENTRY(stext)
@@ -103,7 +104,7 @@ SECTIONS
         __data_loc = ALIGN(4);          /* location in binary */
         . = DATAADDR;
 #else
-        . = ALIGN(8192);
+        . = ALIGN(THREAD_SIZE);
         __data_loc = .;
 #endif