sh: Add support for 4K stacks.

This enables support for 4K stacks on SH.

Currently this depends on DEBUG_KERNEL, but likely all boards
will switch to this as the default in the future.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 5 insertions, 13 deletions

diff --git a/arch/sh/kernel/traps.c b/arch/sh/kernel/traps.c
index 95c810b3c97e..c2c597e09482 100644
--- a/arch/sh/kernel/traps.c
+++ b/arch/sh/kernel/traps.c
@@ -741,20 +741,12 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)
         unsigned long module_end = VMALLOC_END;
         int i = 1;
 
-        if (tsk && !sp) {
+        if (!tsk)
+                tsk = current;
+        if (tsk == current)
+                sp = (unsigned long *)current_stack_pointer;
+        else
                 sp = (unsigned long *)tsk->thread.sp;
-        }
-
-        if (!sp) {
-                __asm__ __volatile__ (
-                        "mov r15, %0\n\t"
-                        "stc r7_bank, %1\n\t"
-                        : "=r" (module_start),
-                          "=r" (module_end)
-                );
-                
-                sp = (unsigned long *)module_start;
-        }
 
         stack = sp;