linux-kernel - [PATCH 11/17] x86-64: Move isidle from PDA to per-cpu.

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Date:	Fri, 16 Jan 2009 09:16:30 -0500
From:	Brian Gerst <brgerst@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Brian Gerst <brgerst@...il.com>
Subject: [PATCH 11/17] x86-64: Move isidle from PDA to per-cpu.

Signed-off-by: Brian Gerst <brgerst@...il.com>
---
 arch/x86/include/asm/pda.h   |    1 -
 arch/x86/kernel/process_64.c |    5 +++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/pda.h b/arch/x86/include/asm/pda.h
index b30ef6b..c31ca04 100644
--- a/arch/x86/include/asm/pda.h
+++ b/arch/x86/include/asm/pda.h
@@ -23,7 +23,6 @@ struct x8664_pda {
 					   offset 40!!! */
 #endif
 	short in_bootmem;		/* pda lives in bootmem */
-	short isidle;
 } ____cacheline_aligned_in_smp;
 
 DECLARE_PER_CPU(struct x8664_pda, __pda);
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index d4a7391..3cf12f4 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -61,6 +61,7 @@ DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
 EXPORT_PER_CPU_SYMBOL(current_task);
 
 DEFINE_PER_CPU(unsigned long, oldrsp);
+static DEFINE_PER_CPU(unsigned char, isidle);
 
 unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
 
@@ -80,13 +81,13 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
 
 void enter_idle(void)
 {
-	write_pda(isidle, 1);
+	percpu_write(isidle, 1);
 	atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
 }
 
 static void __exit_idle(void)
 {
-	if (test_and_clear_bit_pda(0, isidle) == 0)
+	if (x86_test_and_clear_bit_percpu(0, isidle) == 0)
 		return;
 	atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
 }
-- 
1.6.1.rc1

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