sched/core: Remove unused prefetch_stack()

prefetch_stack() is defined by IA64, but not actually used anywhere anymore. Remove it. Acked-by: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
berg · Mar 3, 2017 · 2c873d5 · 2c873d5
1 parent b68070e
commit 2c873d5
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Showing 3 changed files with 0 additions and 31 deletions.
diff --git 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
@@ -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
@@ -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;