sched/core: Remove unused prefetch_stack()

prefetch_stack() is defined by IA64, but not actually used anywhere anymore.

Remove it.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 0 insertions, 31 deletions

diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 03911a336406..26a63d69c599 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -19,8 +19,6 @@
 #include <asm/ptrace.h>
 #include <asm/ustack.h>
 
-#define ARCH_HAS_PREFETCH_SWITCH_STACK
-
 #define IA64_NUM_PHYS_STACK_REG 96
 #define IA64_NUM_DBG_REGS       8
 
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index 6f27a663177c..e7a716b09350 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -455,29 +455,6 @@ GLOBAL_ENTRY(load_switch_stack)
         br.cond.sptk.many b7
 END(load_switch_stack)
 
-GLOBAL_ENTRY(prefetch_stack)
-        add r14 = -IA64_SWITCH_STACK_SIZE, sp
-        add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0
-        ;;
-        ld8 r16 = [r15]                         // load next's stack pointer
-        lfetch.fault.excl [r14], 128
-        ;;
-        lfetch.fault.excl [r14], 128
-        lfetch.fault [r16], 128
-        ;;
-        lfetch.fault.excl [r14], 128
-        lfetch.fault [r16], 128
-        ;;
-        lfetch.fault.excl [r14], 128
-        lfetch.fault [r16], 128
-        ;;
-        lfetch.fault.excl [r14], 128
-        lfetch.fault [r16], 128
-        ;;
-        lfetch.fault [r16], 128
-        br.ret.sptk.many rp
-END(prefetch_stack)
-
         /*
          * Invoke a system call, but do some tracing before and after the call.
          * We MUST preserve the current register frame throughout this routine
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5720d11f3224..bd0111a06aa2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -247,12 +247,6 @@ struct sched_info {
 # define SCHED_FIXEDPOINT_SHIFT 10
 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT)
 
-#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
-extern void prefetch_stack(struct task_struct *t);
-#else
-static inline void prefetch_stack(struct task_struct *t) { }
-#endif
-
 struct load_weight {
         unsigned long weight;
         u32 inv_weight;