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[PATCH] x86_64: Remove enable/disable_hlt

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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: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-01-11 22:42:42 +01:00 committed by Linus Torvalds
parent 7eb903f4a5
commit 2d52ede987
2 changed files with 9 additions and 37 deletions
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39
arch/x86_64/kernel/process.c
View file

@ -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..
@ -88,21 +72,16 @@ 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()) {
local_irq_disable();
if (!need_resched())
safe_halt();
else
local_irq_enable();
}
set_thread_flag(TIF_POLLING_NRFLAG);
} else {
while (!need_resched())
cpu_relax();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb__after_clear_bit();
while (!need_resched()) {
local_irq_disable();
if (!need_resched())
safe_halt();
else
local_irq_enable();
}
set_thread_flag(TIF_POLLING_NRFLAG);
}
/*

7
include/asm-x86_64/system.h
View file

@ -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