From: Ingo Molnar <mingo@kernel.org>
Date: Sun, 5 Feb 2017 11:11:03 +0000 (+0100)
Subject: sched/core: Remove unused prefetch_stack()
X-Git-Tag: v4.14-rc1~1357^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2c873d55cd838deef8218b6d5fe9bd336cb3113a;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 03911a3..26a63d6 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 6f27a66..e7a716b 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 5720d11..bd0111a 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;