[PATCH] alpha: task_stack_page()

use task_stack_page() for accesses to stack page of task in alpha-specific
parts of tree

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/alpha/kernel/process.c

@@ -276,7 +276,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 {
 	extern void ret_from_fork(void);
 
-	struct thread_info *childti = p->thread_info;
+	struct thread_info *childti = task_thread_info(p);
 	struct pt_regs * childregs;
 	struct switch_stack * childstack, *stack;
 	unsigned long stack_offset, settls;
@@ -285,7 +285,7 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	if (!(regs->ps & 8))
 		stack_offset = (PAGE_SIZE-1) & (unsigned long) regs;
 	childregs = (struct pt_regs *)
-	  (stack_offset + PAGE_SIZE + (long) childti);
+	  (stack_offset + PAGE_SIZE + task_stack_page(p));
 		
 	*childregs = *regs;
 	settls = regs->r20;
@@ -492,7 +492,7 @@ out:
 unsigned long
 thread_saved_pc(task_t *t)
 {
-	unsigned long base = (unsigned long)t->thread_info;
+	unsigned long base = (unsigned long)task_stack_page(t);
 	unsigned long fp, sp = task_thread_info(t)->pcb.ksp;
 
 	if (sp > base && sp+6*8 < base + 16*1024) {

arch/alpha/kernel/ptrace.c

@@ -110,7 +110,7 @@ get_reg_addr(struct task_struct * task, unsigned long regno)
 		zero = 0;
 		addr = &zero;
 	} else {
-		addr = (void *)task->thread_info + regoff[regno];
+		addr = task_stack_page(task) + regoff[regno];
 	}
 	return addr;
 }

include/asm-alpha/ptrace.h

@@ -76,7 +76,7 @@ struct switch_stack {
 extern void show_regs(struct pt_regs *);
 
 #define alpha_task_regs(task) \
-  ((struct pt_regs *) ((long) (task)->thread_info + 2*PAGE_SIZE) - 1)
+  ((struct pt_regs *) (task_stack_page(task) + 2*PAGE_SIZE) - 1)
 
 #define force_successful_syscall_return() (alpha_task_regs(current)->r0 = 0)