[PATCH] arm: task_stack_page()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/arm/kernel/process.c

@@ -460,7 +460,7 @@ unsigned long get_wchan(struct task_struct *p)
 		return 0;
 
 	stack_start = (unsigned long)end_of_stack(p);
-	stack_end = ((unsigned long)p->thread_info) + THREAD_SIZE;
+	stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
 
 	fp = thread_saved_fp(p);
 	do {

arch/arm/kernel/smp.c

@@ -114,7 +114,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
 	 * We need to tell the secondary core where to find
 	 * its stack and the page tables.
 	 */
-	secondary_data.stack = (void *)idle->thread_info + THREAD_START_SP;
+	secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
 	secondary_data.pgdir = virt_to_phys(pgd);
 	wmb();
 
@@ -245,7 +245,7 @@ void __cpuexit cpu_die(void)
 	__asm__("mov	sp, %0\n"
 	"	b	secondary_start_kernel"
 		:
-		: "r" ((void *)current->thread_info + THREAD_SIZE - 8));
+		: "r" (task_stack_page(current) + THREAD_SIZE - 8));
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 

arch/arm/kernel/traps.c

@@ -210,7 +210,7 @@ static void __die(const char *str, int err, struct thread_info *thread, struct p
 
 	if (!user_mode(regs) || in_interrupt()) {
 		dump_mem("Stack: ", regs->ARM_sp,
-			 THREAD_SIZE + (unsigned long)tsk->thread_info);
+			 THREAD_SIZE + (unsigned long)task_stack_page(tsk));
 		dump_backtrace(regs, tsk);
 		dump_instr(regs);
 	}

include/asm-arm/processor.h

@@ -86,7 +86,7 @@ unsigned long get_wchan(struct task_struct *p);
 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 
 #define task_pt_regs(p) \
-	((struct pt_regs *)(THREAD_START_SP + (void *)(p)->thread_info) - 1)
+	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 
 #define KSTK_EIP(tsk)	task_pt_regs(tsk)->ARM_pc
 #define KSTK_ESP(tsk)	task_pt_regs(tsk)->ARM_sp