[PATCH] Remove most of the special cases for the debug IST stack

Remove most of the special cases for the debug IST stack.  This is a
follow on clean up patch, it requires the bug fix patch that adds
orig_ist.

Signed-off-by: Keith Owens <kaos@ocs.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 1 insertions, 20 deletions

diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index 38bc821e457b..fb8486eca1b6 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -162,26 +162,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
          * 'stack' is in one of them:
          */
         for (k = 0; k < N_EXCEPTION_STACKS; k++) {
-                unsigned long end;
-
-                /*
-                 * set 'end' to the end of the exception stack.
-                 */
-                switch (k + 1) {
-                /*
-                 * TODO: this block is not needed i think, because
-                 * setup64.c:cpu_init() sets up t->ist[DEBUG_STACK]
-                 * properly too.
-                 */
-#if DEBUG_STKSZ > EXCEPTION_STKSZ
-                case DEBUG_STACK:
-                        end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
-                        break;
-#endif
-                default:
-                        end = per_cpu(orig_ist, cpu).ist[k];
-                        break;
-                }
+                unsigned long end = per_cpu(orig_ist, cpu).ist[k];
                 /*
                  * Is 'stack' above this exception frame's end?
                  * If yes then skip to the next frame.