linux-kernel - [PATCH 3/5] x86: remove is

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Message-Id: <e4a24197cf9c227fcd1ca2df09999eaec9052f49.1479449716.git.len.brown@intel.com>
Date:   Fri, 18 Nov 2016 01:23:19 -0500
From:   Len Brown <lenb@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: [PATCH 3/5] x86: remove is_idle flag

From: Len Brown <len.brown@...el.com>

Upon removal of the idle_notifier, all accesses to
the "is_idle" flag serve no purpose.

Signed-off-by: Len Brown <len.brown@...el.com>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/kernel/process.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index f51950715145..d8e9d794e114 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -65,10 +65,6 @@ __visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss) = {
 };
 EXPORT_PER_CPU_SYMBOL(cpu_tss);
 
-#ifdef CONFIG_X86_64
-static DEFINE_PER_CPU(unsigned char, is_idle);
-#endif
-
 /*
  * this gets called so that we can store lazy state into memory and copy the
  * current task into the new thread.
@@ -241,13 +237,10 @@ static inline void play_dead(void)
 #ifdef CONFIG_X86_64
 void enter_idle(void)
 {
-	this_cpu_write(is_idle, 1);
 }
 
 static void __exit_idle(void)
 {
-	if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
-		return;
 }
 
 /* Called from interrupts to signify idle end */
-- 
2.11.0.rc1