sparc64: Use kstack_valid() in die_if_kernel().

This gets rid of a local function (is_kernel_stack()) which tries to
do the same thing, yet poorly in that it doesn't handle IRQ stacks
properly.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c
index bdc05a2..2ff178c 100644 (file)
--- a/arch/sparc/kernel/traps_64.c
+++ b/arch/sparc/kernel/traps_64.c
@@ -2202,27 +2202,6 @@ void dump_stack(void)
 
 EXPORT_SYMBOL(dump_stack);
 
-static inline int is_kernel_stack(struct task_struct *task,
-                                 struct reg_window *rw)
-{
-       unsigned long rw_addr = (unsigned long) rw;
-       unsigned long thread_base, thread_end;
-
-       if (rw_addr < PAGE_OFFSET) {
-               if (task != &init_task)
-                       return 0;
-       }
-
-       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 &&
-           !(rw_addr & 0x7UL))
-               return 1;
-
-       return 0;
-}
-
 static inline struct reg_window *kernel_stack_up(struct reg_window *rw)
 {
        unsigned long fp = rw->ins[6];
@@ -2251,6 +2230,7 @@ void die_if_kernel(char *str, struct pt_regs *regs)
        show_regs(regs);
        add_taint(TAINT_DIE);
        if (regs->tstate & TSTATE_PRIV) {
+               struct thread_info *tp = current_thread_info();
                struct reg_window *rw = (struct reg_window *)
                        (regs->u_regs[UREG_FP] + STACK_BIAS);
 
@@ -2258,8 +2238,8 @@ void die_if_kernel(char *str, struct pt_regs *regs)
                 * find some badly aligned kernel stack.
                 */
                while (rw &&
-                      count++ < 30&&
-                      is_kernel_stack(current, rw)) {
+                      count++ < 30 &&
+                      kstack_valid(tp, (unsigned long) rw)) {
                        printk("Caller[%016lx]: %pS\n", rw->ins[7],
                               (void *) rw->ins[7]);