Commit 2d52ede9 authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[PATCH] x86_64: Remove enable/disable_hlt 



Was only used by the floppy driver to work around some ancient
hardware bug that should never occur on any 64bit system.

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 7eb903f4

arch/x86_64/kernel/process.c

+9 −30
Original line number Diff line number Diff line
@@ -55,8 +55,6 @@ asmlinkage extern void ret_from_fork(void); 


unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;



static atomic_t hlt_counter = ATOMIC_INIT(0);



unsigned long boot_option_idle_override = 0;

EXPORT_SYMBOL(boot_option_idle_override);
@@ -66,20 +64,6 @@ EXPORT_SYMBOL(boot_option_idle_override); 
void (*pm_idle)(void);

static DEFINE_PER_CPU(unsigned int, cpu_idle_state);



void disable_hlt(void)

{

	atomic_inc(&hlt_counter);

}



EXPORT_SYMBOL(disable_hlt);



void enable_hlt(void)

{

	atomic_dec(&hlt_counter);

}



EXPORT_SYMBOL(enable_hlt);



/*

 * We use this if we don't have any better

 * idle routine..
@@ -88,7 +72,6 @@ void default_idle(void) 
{

	local_irq_enable();



	if (!atomic_read(&hlt_counter)) {

	clear_thread_flag(TIF_POLLING_NRFLAG);

	smp_mb__after_clear_bit();

	while (!need_resched()) {
@@ -99,10 +82,6 @@ void default_idle(void) 
			local_irq_enable();

	}

	set_thread_flag(TIF_POLLING_NRFLAG);

	} else {

		while (!need_resched())

			cpu_relax();

	}

}



/*

include/asm-x86_64/system.h

+0 −7
Original line number Diff line number Diff line
@@ -330,13 +330,6 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, 


void cpu_idle_wait(void);



/*

 * disable hlt during certain critical i/o operations

 */

#define HAVE_DISABLE_HLT

void disable_hlt(void);

void enable_hlt(void);



extern unsigned long arch_align_stack(unsigned long sp);



#endif