Merge master.kernel.org:/home/rmk/linux-2.6-serial

[powerpc.git] / arch / s390 / kernel / process.c

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 9f3dff6..008c745 100644 (file)
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -58,10 +58,18 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
-       struct stack_frame *sf;
+       struct stack_frame *sf, *low, *high;
 
-       sf = (struct stack_frame *) tsk->thread.ksp;
-       sf = (struct stack_frame *) sf->back_chain;
+       if (!tsk || !task_stack_page(tsk))
+               return 0;
+       low = task_stack_page(tsk);
+       high = (struct stack_frame *) task_pt_regs(tsk);
+       sf = (struct stack_frame *) (tsk->thread.ksp & PSW_ADDR_INSN);
+       if (sf <= low || sf > high)
+               return 0;
+       sf = (struct stack_frame *) (sf->back_chain & PSW_ADDR_INSN);
+       if (sf <= low || sf > high)
+               return 0;
        return sf->gprs[8];
 }
 
@@ -99,15 +107,15 @@ void default_idle(void)
 {
        int cpu, rc;
 
+       /* CPU is going idle. */
+       cpu = smp_processor_id();
+
        local_irq_disable();
-        if (need_resched()) {
+       if (need_resched()) {
                local_irq_enable();
-                schedule();
-                return;
-        }
+               return;
+       }
 
-       /* CPU is going idle. */
-       cpu = smp_processor_id();
        rc = notifier_call_chain(&idle_chain, CPU_IDLE, (void *)(long) cpu);
        if (rc != NOTIFY_OK && rc != NOTIFY_DONE)
                BUG();
@@ -120,7 +128,7 @@ void default_idle(void)
        __ctl_set_bit(8, 15);
 
 #ifdef CONFIG_HOTPLUG_CPU
-       if (cpu_is_offline(smp_processor_id()))
+       if (cpu_is_offline(cpu))
                cpu_die();
 #endif
 
@@ -139,15 +147,21 @@ void default_idle(void)
 
 void cpu_idle(void)
 {
-       for (;;)
-               default_idle();
+       for (;;) {
+               while (!need_resched())
+                       default_idle();
+
+               preempt_enable_no_resched();
+               schedule();
+               preempt_disable();
+       }
 }
 
 void show_regs(struct pt_regs *regs)
 {
        struct task_struct *tsk = current;
 
-        printk("CPU:    %d    %s\n", tsk->thread_info->cpu, print_tainted());
+        printk("CPU:    %d    %s\n", task_thread_info(tsk)->cpu, print_tainted());
         printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
               current->comm, current->pid, (void *) tsk,
               (void *) tsk->thread.ksp);
@@ -211,8 +225,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
             struct pt_regs childregs;
           } *frame;
 
-        frame = ((struct fake_frame *)
-                (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
+        frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
         p->thread.ksp = (unsigned long) frame;
        /* Store access registers to kernel stack of new process. */
         frame->childregs = *regs;
@@ -229,7 +242,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
        /* Save access registers to new thread structure. */
        save_access_regs(&p->thread.acrs[0]);
 
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
         /*
         * save fprs to current->thread.fp_regs to merge them with
         * the emulated registers and then copy the result to the child.
@@ -241,7 +254,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
        /* Set a new TLS ?  */
        if (clone_flags & CLONE_SETTLS)
                p->thread.acrs[0] = regs->gprs[6];
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
        /* Save the fpu registers to new thread structure. */
        save_fp_regs(&p->thread.fp_regs);
         p->thread.user_seg = __pa((unsigned long) p->mm->pgd) | _REGION_TABLE;
@@ -254,7 +267,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long new_stackp,
                        p->thread.acrs[1] = (unsigned int) regs->gprs[6];
                }
        }
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
        /* start new process with ar4 pointing to the correct address space */
        p->thread.mm_segment = get_fs();
         /* Don't copy debug registers */
@@ -333,51 +346,29 @@ out:
  */
 int dump_fpu (struct pt_regs * regs, s390_fp_regs *fpregs)
 {
-#ifndef CONFIG_ARCH_S390X
+#ifndef CONFIG_64BIT
         /*
         * save fprs to current->thread.fp_regs to merge them with
         * the emulated registers and then copy the result to the dump.
         */
        save_fp_regs(&current->thread.fp_regs);
        memcpy(fpregs, &current->thread.fp_regs, sizeof(s390_fp_regs));
-#else /* CONFIG_ARCH_S390X */
+#else /* CONFIG_64BIT */
        save_fp_regs(fpregs);
-#endif /* CONFIG_ARCH_S390X */
+#endif /* CONFIG_64BIT */
        return 1;
 }
 
-/*
- * fill in the user structure for a core dump..
- */
-void dump_thread(struct pt_regs * regs, struct user * dump)
-{
-
-/* changed the size calculations - should hopefully work better. lbt */
-       dump->magic = CMAGIC;
-       dump->start_code = 0;
-       dump->start_stack = regs->gprs[15] & ~(PAGE_SIZE - 1);
-       dump->u_tsize = current->mm->end_code >> PAGE_SHIFT;
-       dump->u_dsize = (current->mm->brk + PAGE_SIZE - 1) >> PAGE_SHIFT;
-       dump->u_dsize -= dump->u_tsize;
-       dump->u_ssize = 0;
-       if (dump->start_stack < TASK_SIZE)
-               dump->u_ssize = (TASK_SIZE - dump->start_stack) >> PAGE_SHIFT;
-       memcpy(&dump->regs, regs, sizeof(s390_regs));
-       dump_fpu (regs, &dump->regs.fp_regs);
-       dump->regs.per_info = current->thread.per_info;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
        struct stack_frame *sf, *low, *high;
        unsigned long return_address;
        int count;
 
-       if (!p || p == current || p->state == TASK_RUNNING || !p->thread_info)
+       if (!p || p == current || p->state == TASK_RUNNING || !task_stack_page(p))
                return 0;
-       low = (struct stack_frame *) p->thread_info;
-       high = (struct stack_frame *)
-               ((unsigned long) p->thread_info + THREAD_SIZE) - 1;
+       low = task_stack_page(p);
+       high = (struct stack_frame *) task_pt_regs(p);
        sf = (struct stack_frame *) (p->thread.ksp & PSW_ADDR_INSN);
        if (sf <= low || sf > high)
                return 0;