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Commit c2558e0e authored by Brian Gerst's avatar Brian Gerst Committed by Tejun Heo
Browse files

x86-64: Move isidle from PDA to per-cpu. 



tj: s/isidle/is_idle/

Signed-off-by: default avatarBrian Gerst <brgerst@gmail.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent e7a22c1e

arch/x86/include/asm/pda.h

+0 −1
Original line number Diff line number Diff line
@@ -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);

arch/x86/kernel/process_64.c

+3 −2
Original line number Diff line number Diff line
@@ -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, old_rsp);

static DEFINE_PER_CPU(unsigned char, is_idle);



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(is_idle, 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, is_idle) == 0)

		return;

	atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);

}