[PARISC] Kill off broken irqstack code

It's been unfinished and broken long enough, and I have some ideas on how
to do it more cleanly.

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

1 files changed, 3 insertions, 34 deletions

diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index f324939bb9af..111d47284eac 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -98,7 +98,6 @@
          * The "get_stack" macros are responsible for determining the
          * kernel stack value.
          *
-         * For Faults:
          *      If sr7 == 0
          *          Already using a kernel stack, so call the
          *          get_stack_use_r30 macro to push a pt_regs structure
@@ -110,26 +109,6 @@
          *          task pointer pointed to by cr30. Set the stack
          *          pointer to point to the end of the task structure.
          *
-         * For Interrupts:
-         *      If sr7 == 0
-         *          Already using a kernel stack, check to see if r30
-         *          is already pointing to the per processor interrupt
-         *          stack. If it is, call the get_stack_use_r30 macro
-         *          to push a pt_regs structure on the stack, and store
-         *          registers there. Otherwise, call get_stack_use_cr31
-         *          to get a pointer to the base of the interrupt stack
-         *          and push a pt_regs structure on that stack.
-         *      else
-         *          Need to set up a kernel stack, so call the
-         *          get_stack_use_cr30 macro to set up a pointer
-         *          to the pt_regs structure contained within the
-         *          task pointer pointed to by cr30. Set the stack
-         *          pointer to point to the end of the task structure.
-         *          N.B: We don't use the interrupt stack for the
-         *          first interrupt from userland, because signals/
-         *          resched's are processed when returning to userland,
-         *          and we can sleep in those cases.
-         *
          * Note that we use shadowed registers for temps until
          * we can save %r26 and %r29. %r26 is used to preserve
          * %r8 (a shadowed register) which temporarily contained
@@ -1086,23 +1065,13 @@ intr_do_preempt:
 
 intr_extint:
         CMPIB=,n 0,%r16,1f
+
         get_stack_use_cr30
-        b,n 3f
+        b,n 2f
 
 1:
-#if 0  /* Interrupt Stack support not working yet! */
-        mfctl   %cr31,%r1
-        copy    %r30,%r17
-        /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
-        DEPI    0,31,15,%r17
-        CMPB=,n %r1,%r17,2f
-        get_stack_use_cr31
-        b,n 3f
-#endif
-2:
         get_stack_use_r30
-
-3:
+2:
         save_specials   %r29
         virt_map
         save_general    %r29