From 2c873d55cd838deef8218b6d5fe9bd336cb3113a Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Sun, 5 Feb 2017 12:11:03 +0100
Subject: [PATCH] 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>
---
arch/ia64/include/asm/processor.h | 2 --
arch/ia64/kernel/entry.S | 23 -----------------------
include/linux/sched.h | 6 ------
3 files changed, 31 deletions(-)
diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 03911a3364068..26a63d69c599a 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 6f27a663177c4..e7a716b09350d 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 5720d11f32247..bd0111a06aa25 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;
--
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