sparc64: Kill CONFIG_STACK_DEBUG code.

The generic stack tracer does this job just as well.

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

2 files changed, 1 insertions, 78 deletions

diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
index 9d3c889718ac..1b4a831565f9 100644
--- a/arch/sparc/Kconfig.debug
+++ b/arch/sparc/Kconfig.debug
@@ -19,13 +19,10 @@ config DEBUG_DCFLUSH
         bool "D-cache flush debugging"
         depends on SPARC64 && DEBUG_KERNEL
 
-config STACK_DEBUG
-        bool "Stack Overflow Detection Support"
-
 config MCOUNT
         bool
         depends on SPARC64
-        depends on STACK_DEBUG || FUNCTION_TRACER
+        depends on FUNCTION_TRACER
         default y
 
 config FRAME_POINTER
diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S
index 7047997be0eb..73ed0f3aaa0c 100644
--- a/arch/sparc/lib/mcount.S
+++ b/arch/sparc/lib/mcount.S
@@ -7,26 +7,11 @@
 
 #include <linux/linkage.h>
 
-#include <asm/ptrace.h>
-#include <asm/thread_info.h>
-
 /*
  * This is the main variant and is called by C code.  GCC's -pg option
  * automatically instruments every C function with a call to this.
  */
 
-#ifdef CONFIG_STACK_DEBUG
-
-#define OVSTACKSIZE     4096            /* lets hope this is enough */
-
-        .data
-        .align          8
-panicstring:
-        .asciz          "Stack overflow\n"
-        .align          8
-ovstack:
-        .skip           OVSTACKSIZE
-#endif
         .text
         .align          32
         .globl          _mcount
@@ -35,65 +20,6 @@ ovstack:
         .type           mcount,#function
 _mcount:
 mcount:
-#ifdef CONFIG_STACK_DEBUG
-        /*
-         * Check whether %sp is dangerously low.
-         */
-        ldub            [%g6 + TI_FPDEPTH], %g1
-        srl             %g1, 1, %g3
-        add             %g3, 1, %g3
-        sllx            %g3, 8, %g3                     ! each fpregs frame is 256b
-        add             %g3, 192, %g3
-        add             %g6, %g3, %g3                   ! where does task_struct+frame end?
-        sub             %g3, STACK_BIAS, %g3
-        cmp             %sp, %g3
-        bg,pt           %xcc, 1f
-         nop
-        lduh            [%g6 + TI_CPU], %g1
-        sethi           %hi(hardirq_stack), %g3
-        or              %g3, %lo(hardirq_stack), %g3
-        sllx            %g1, 3, %g1
-        ldx             [%g3 + %g1], %g7
-        sub             %g7, STACK_BIAS, %g7
-        cmp             %sp, %g7
-        bleu,pt         %xcc, 2f
-         sethi          %hi(THREAD_SIZE), %g3
-        add             %g7, %g3, %g7
-        cmp             %sp, %g7
-        blu,pn          %xcc, 1f
-2:       sethi          %hi(softirq_stack), %g3
-        or              %g3, %lo(softirq_stack), %g3
-        ldx             [%g3 + %g1], %g7
-        sub             %g7, STACK_BIAS, %g7
-        cmp             %sp, %g7
-        bleu,pt         %xcc, 3f
-         sethi          %hi(THREAD_SIZE), %g3
-        add             %g7, %g3, %g7
-        cmp             %sp, %g7
-        blu,pn          %xcc, 1f
-         nop
-        /* If we are already on ovstack, don't hop onto it
-         * again, we are already trying to output the stack overflow
-         * message.
-         */
-3:      sethi           %hi(ovstack), %g7               ! cant move to panic stack fast enough
-         or             %g7, %lo(ovstack), %g7
-        add             %g7, OVSTACKSIZE, %g3
-        sub             %g3, STACK_BIAS + 192, %g3
-        sub             %g7, STACK_BIAS, %g7
-        cmp             %sp, %g7
-        blu,pn          %xcc, 2f
-         cmp            %sp, %g3
-        bleu,pn         %xcc, 1f
-         nop
-2:      mov             %g3, %sp
-        sethi           %hi(panicstring), %g3
-        call            prom_printf
-         or             %g3, %lo(panicstring), %o0
-        call            prom_halt
-         nop
-1:
-#endif
 #ifdef CONFIG_FUNCTION_TRACER
 #ifdef CONFIG_DYNAMIC_FTRACE
         /* Do nothing, the retl/nop below is all we need.  */