linux-kernel - [tip:x86/idle] x86/idle: Remove is

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Date:   Fri, 18 Nov 2016 03:20:26 -0800
From:   tip-bot for Len Brown <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...nel.org,
        len.brown@...el.com, tglx@...utronix.de, peterz@...radead.org
Subject: [tip:x86/idle] x86/idle: Remove is_idle flag

Commit-ID:  f08b5fe2d4eeb0a8a6e0e7e71928cf2c7b1b791d
Gitweb:     http://git.kernel.org/tip/f08b5fe2d4eeb0a8a6e0e7e71928cf2c7b1b791d
Author:     Len Brown <len.brown@...el.com>
AuthorDate: Fri, 18 Nov 2016 01:23:19 -0500
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 18 Nov 2016 12:07:57 +0100

x86/idle: Remove is_idle flag

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: Ingo Molnar <mingo@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: http://lkml.kernel.org/r/e4a24197cf9c227fcd1ca2df09999eaec9052f49.1479449716.git.len.brown@intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 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 f519507..d8e9d79 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 */