[SPARC64]: Elminate all usage of hard-coded trap globals.

[firefly-linux-kernel-4.4.55.git] / arch / sparc64 / kernel / traps.c

diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index 5570e7bb22bb5a34db2bc7c1fd06feeda2ffdb9f..f47f4874253cb12e8897f047814292b96aed5da5 100644 (file)
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -1808,7 +1808,7 @@ static void user_instruction_dump (unsigned int __user *pc)
 void show_stack(struct task_struct *tsk, unsigned long *_ksp)
 {
        unsigned long pc, fp, thread_base, ksp;
-       struct thread_info *tp = tsk->thread_info;
+       void *tp = task_stack_page(tsk);
        struct reg_window *rw;
        int count = 0;
 
@@ -1862,7 +1862,7 @@ static inline int is_kernel_stack(struct task_struct *task,
                        return 0;
        }
 
-       thread_base = (unsigned long) task->thread_info;
+       thread_base = (unsigned long) task_stack_page(task);
        thread_end = thread_base + sizeof(union thread_union);
        if (rw_addr >= thread_base &&
            rw_addr < thread_end &&
@@ -2130,7 +2130,22 @@ void do_getpsr(struct pt_regs *regs)
        }
 }
 
+struct trap_per_cpu trap_block[NR_CPUS];
+
+/* This can get invoked before sched_init() so play it super safe
+ * and use hard_smp_processor_id().
+ */
+void init_cur_cpu_trap(void)
+{
+       int cpu = hard_smp_processor_id();
+       struct trap_per_cpu *p = &trap_block[cpu];
+
+       p->thread = current_thread_info();
+       p->pgd_paddr = 0;
+}
+
 extern void thread_info_offsets_are_bolixed_dave(void);
+extern void trap_per_cpu_offsets_are_bolixed_dave(void);
 
 /* Only invoked on boot processor. */
 void __init trap_init(void)
@@ -2165,6 +2180,10 @@ void __init trap_init(void)
            (TI_FPREGS & (64 - 1)))
                thread_info_offsets_are_bolixed_dave();
 
+       if (TRAP_PER_CPU_THREAD != offsetof(struct trap_per_cpu, thread) ||
+           TRAP_PER_CPU_PGD_PADDR != offsetof(struct trap_per_cpu, pgd_paddr))
+               trap_per_cpu_offsets_are_bolixed_dave();
+
        /* Attach to the address space of init_task.  On SMP we
         * do this in smp.c:smp_callin for other cpus.
         */