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alistair23-linux/arch/x86/include/asm
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Len Brown f6365201d8 x86: Remove the ancient and deprecated disable_hlt() and enable_hlt() facility 
The X86_32-only disable_hlt/enable_hlt mechanism was used by the
32-bit floppy driver. Its effect was to replace the use of the
HLT instruction inside default_idle() with cpu_relax() - essentially
it turned off the use of HLT.

This workaround was commented in the code as:

 "disable hlt during certain critical i/o operations"

 "This halt magic was a workaround for ancient floppy DMA
  wreckage. It should be safe to remove."

H. Peter Anvin additionally adds:

 "To the best of my knowledge, no-hlt only existed because of
  flaky power distributions on 386/486 systems which were sold to
  run DOS.  Since DOS did no power management of any kind,
  including HLT, the power draw was fairly uniform; when exposed
  to the much hhigher noise levels you got when Linux used HLT
  caused some of these systems to fail.

  They were by far in the minority even back then."

Alan Cox further says:

 "Also for the Cyrix 5510 which tended to go castors up if a HLT
  occurred during a DMA cycle and on a few other boxes HLT during
  DMA tended to go astray.

  Do we care ? I doubt it. The 5510 was pretty obscure, the 5520
  fixed it, the 5530 is probably the oldest still in any kind of
  use."

So, let's finally drop this.

Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Stephen Hemminger <shemminger@vyatta.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/n/tip-3rhk9bzf0x9rljkv488tloib@git.kernel.org
[ If anyone cares then alternative instruction patching could be
  used to replace HLT with a one-byte NOP instruction. Much simpler. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-03-30 08:50:27 +02:00
..
numachip x86: Add NumaChip support 2011-12-05 17:17:24 +01:00
uv x86/uv: Fix uv_gpa_to_soc_phys_ram() shift 2012-01-26 10:58:27 +01:00
visws
xen xen/enlighten: Expose MWAIT and MWAIT_LEAF if hypervisor OKs it. 2012-03-10 12:44:44 -05:00
a.out-core.h
a.out.h
acpi.h
aes.h
agp.h
alternative-asm.h x86: Fix atomic64_xxx_cx8() functions 2012-01-04 15:01:56 +01:00
alternative.h x86: Adjust asm constraints in atomic64 wrappers 2012-01-20 17:29:31 -08:00
amd_nb.h x86/PCI: amd: factor out MMCONFIG discovery 2012-01-06 12:11:19 -08:00
apb_timer.h Merge branch 'timers-clocksource-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-07-23 10:34:47 -07:00
apic.h Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 14:28:26 -07:00
apic_flat_64.h x86: Make flat_init_apic_ldr() available 2011-12-05 17:17:07 +01:00
apicdef.h x86, x2apic: Fallback to xapic when BIOS doesn't setup interrupt-remapping 2011-12-23 11:01:01 -08:00
apm.h
arch_hweight.h
archrandom.h x86, random: Verify RDRAND functionality and allow it to be disabled 2011-07-31 14:02:19 -07:00
asm-offsets.h
asm.h
atomic.h x86: Use xadd helper more widely 2011-08-29 13:44:12 -07:00
atomic64_32.h x86: atomic64 assembly improvements 2012-01-20 17:29:49 -08:00
atomic64_64.h x86: Use xadd helper more widely 2011-08-29 13:44:12 -07:00
auxvec.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
barrier.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
bios_ebda.h
bitops.h x86_64, asm: Optimise fls(), ffs() and fls64() 2011-12-15 15:16:49 -08:00
bitsperlong.h
boot.h
bootparam.h x86: Add missing bzImage fields to struct setup_header 2011-12-09 17:35:33 -08:00
bug.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
bugs.h
byteorder.h
cache.h
cacheflush.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
calgary.h
calling.h
ce4100.h
checksum.h
checksum_32.h
checksum_64.h
clocksource.h
cmpxchg.h x86: Properly parenthesize cmpxchg() macro arguments 2012-01-26 21:18:29 +01:00
cmpxchg_32.h x86: Fix and improve cmpxchg_double{,_local}() 2012-01-04 15:01:54 +01:00
cmpxchg_64.h x86: Fix and improve cmpxchg_double{,_local}() 2012-01-04 15:01:54 +01:00
compat.h x86: Move is_ia32_task to asm/thread_info.h from asm/compat.h 2012-03-13 16:31:09 +01:00
cpu.h
cpu_device_id.h Add driver auto probing for x86 features v4 2012-01-26 16:44:41 -08:00
cpufeature.h Merge branches 'x86-cpu-for-linus', 'x86-boot-for-linus', 'x86-cpufeature-for-linus', 'x86-process-for-linus' and 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-22 09:28:15 -07:00
cpumask.h
cputime.h
current.h
debugreg.h x86: relocate get/set debugreg fcns to include/asm/debugreg. 2012-02-28 17:48:04 -05:00
delay.h
desc.h x86: Keep current stack in NMI breakpoints 2011-12-21 15:38:55 -05:00
desc_defs.h
device.h iommu: Rename the DMAR and INTR_REMAP config options 2011-09-21 10:22:03 +02:00
div64.h x86/div64: Add a micro-optimization shortcut if base is power of two 2011-12-05 18:16:11 +01:00
dma-mapping.h doc: fix broken references 2011-09-27 18:08:04 +02:00
dma.h
dmi.h
dwarf2.h x86-64: Fix CFI data for interrupt frames 2011-09-28 19:04:52 +02:00
e820.h Revert "x86, efi: Calling __pa() with an ioremap()ed address is invalid" 2011-12-12 18:25:56 +01:00
edac.h
efi.h x86, efi: Allow basic init with mixed 32/64-bit efi/kernel 2012-02-23 18:54:51 -08:00
elf.h Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
emergency-restart.h
entry_arch.h
errno.h
exec.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
fb.h
fcntl.h
fixmap.h x86/intel config: Revamp configuration to allow for Moorestown and Medfield 2011-12-18 09:17:02 +01:00
floppy.h
fpu-internal.h i387: Split up <asm/i387.h> into exported and internal interfaces 2012-02-21 14:12:54 -08:00
frame.h
ftrace.h
futex.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
gart.h
genapic.h
geode.h
gpio.h
hardirq.h x86/time: Eliminate unused irq0_irqs counter 2012-02-27 08:46:25 +01:00
highmem.h highmem: kill all __kmap_atomic() 2012-03-20 21:48:30 +08:00
hpet.h
hugetlb.h
hw_breakpoint.h
hw_irq.h iommu: Rename the DMAR and INTR_REMAP config options 2011-09-21 10:22:03 +02:00
hypertransport.h
hyperv.h Staging: hv: vmbus: Retry vmbus_post_msg() before giving up 2011-08-25 15:23:19 -07:00
hypervisor.h
i387.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
i8259.h
ia32.h x32: Fix alignment fail in struct compat_siginfo 2012-03-14 14:27:52 -07:00
ia32_unistd.h x86: Generate system call tables and unistd_*.h from tables 2011-11-17 13:35:37 -08:00
idle.h x86: Merge the x86_32 and x86_64 cpu_idle() functions 2012-03-26 03:16:07 +02:00
inat.h x86: Fix to decode grouped AVX with VEX pp bits 2012-02-11 15:11:35 +01:00
inat_types.h
init.h x86, mm: Unify zone_sizes_init() 2011-11-11 10:22:55 +01:00
insn.h x86: Fix to decode grouped AVX with VEX pp bits 2012-02-11 15:11:35 +01:00
inst.h
intel_scu_ipc.h x86,mrst: Power control commands update 2011-12-05 12:42:11 +01:00
io.h x86: don't include xen/xen.h in <asm/io.h> unless XEN is enabled 2011-08-03 22:00:38 -10:00
io_apic.h x86/ioapic: Add io_apic_ops driver layer to allow interception 2012-03-28 09:49:29 +02:00
ioctl.h
ioctls.h
iomap.h
iommu.h iommu: Add option to group multi-function devices 2011-11-15 12:22:31 +01:00
iommu_table.h
ipcbuf.h
ipi.h
irq.h
irq_regs.h
irq_remapping.h iommu: Rename the DMAR and INTR_REMAP config options 2011-09-21 10:22:03 +02:00
irq_vectors.h x86/irq: Standardize on CONFIG_SPARSE_IRQ=y 2011-10-13 12:12:12 +02:00
irqflags.h
ist.h
jump_label.h static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
Kbuild x32: Generate <asm/unistd_x32.h> 2012-02-20 12:51:00 -08:00
kdebug.h ptrace: unify show_regs() prototype 2011-07-26 16:49:43 -07:00
kexec.h
kgdb.h kgdb: x86: Return all segment registers also in 64-bit mode 2012-03-22 15:07:15 -05:00
kmap_types.h
kmemcheck.h
kprobes.h
kvm.h KVM: provide synchronous registers in kvm_run 2012-03-05 14:52:22 +02:00
kvm_emulate.h KVM: x86 emulator: Allow PM/VM86 switch during task switch 2012-03-08 14:10:29 +02:00
kvm_host.h KVM: x86 emulator: Fix task switch privilege checks 2012-03-08 14:10:26 +02:00
kvm_para.h KVM guest: KVM Steal time registration 2011-07-24 11:49:36 +03:00
ldt.h
lguest.h
lguest_hcall.h
linkage.h
local.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
local64.h
mach_timer.h time: x86: Remove CLOCK_TICK_RATE from mach_timer.h 2011-11-21 19:00:57 -08:00
mach_traps.h x86/mrst: Avoid reporting wrong nmi status 2011-11-10 16:21:01 +01:00
math_emu.h
mc146818rtc.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
mca.h
mca_dma.h
mce.h x86/mce: Convert static array of pointers to per-cpu variables 2012-02-22 12:58:06 -08:00
microcode.h x86, microcode, AMD: Add a vendor-specific exit function 2011-12-14 12:46:47 +01:00
mman.h
mmconfig.h
mmu.h
mmu_context.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
mmx.h
mmzone.h
mmzone_32.h
mmzone_64.h
module.h
mpspec.h
mpspec_def.h
mrst-vrtc.h
mrst.h x86/mid: Remove Intel Moorestown 2012-01-26 21:23:53 +01:00
msgbuf.h
mshyperv.h
msidef.h
msr-index.h perf/x86: Add Intel LBR MSR definitions 2012-03-05 14:55:39 +01:00
msr.h x86: Document rdmsr_safe restrictions 2011-12-05 14:28:37 +01:00
mtrr.h x86, mtrr: Use explicit sizing and padding for the 64-bit ioctls 2012-03-01 12:48:52 -08:00
mutex.h
mutex_32.h
mutex_64.h
mwait.h
nmi.h x86, nmi: Add in logic to handle multiple events and unknown NMIs 2011-10-10 06:57:01 +02:00
nops.h
numa.h
numa_32.h
numa_64.h
numaq.h
olpc.h
olpc_ofw.h
page.h
page_32.h
page_32_types.h
page_64.h
page_64_types.h
page_types.h Move all declarations of free_initmem() to linux/mm.h 2012-03-28 18:30:03 +01:00
param.h
paravirt.h The following text was taken from the original review request: 2012-03-24 10:08:39 -07:00
paravirt_types.h Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip 2011-08-12 20:46:24 -07:00
parport.h
pat.h
pci-direct.h
pci-functions.h
pci.h x86/PCI: Expand the x86_msi_ops to have a restore MSIs. 2012-01-06 14:02:26 -08:00
pci_64.h
pci_x86.h PCI: Pull PCI 'latency timer' setup up into the core 2012-01-06 12:10:42 -08:00
percpu.h Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2012-01-09 13:08:28 -08:00
perf_event.h Merge branch 'kvm-updates/3.4' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-03-28 14:35:31 -07:00
perf_event_p4.h
pgalloc.h
pgtable-2level.h
pgtable-2level_types.h
pgtable-3level.h
pgtable-3level_types.h
pgtable.h x86: Use "do { } while(0)" for empty flush_tlb_fix_spurious_fault() macro 2011-12-18 09:14:18 +01:00
pgtable_32.h
pgtable_32_types.h
pgtable_64.h
pgtable_64_types.h
pgtable_types.h
poll.h
posix_types.h x32: Create posix_types_x32.h 2012-02-20 12:48:47 -08:00
posix_types_32.h x86: Use generic posix_types.h 2012-02-14 12:01:30 -08:00
posix_types_64.h x86: Use generic posix_types.h 2012-02-14 12:01:30 -08:00
posix_types_x32.h x32: Create posix_types_x32.h 2012-02-20 12:48:47 -08:00
prctl.h
probe_roms.h
processor-cyrix.h
processor-flags.h x86: Fix rflags in FAKE_STACK_FRAME 2011-12-06 10:02:38 +01:00
processor.h x86: Remove the ancient and deprecated disable_hlt() and enable_hlt() facility 2012-03-30 08:50:27 +02:00
prom.h irq_domain/x86: Convert x86 (embedded) to use common irq_domain 2012-02-23 14:37:47 -07:00
proto.h
ptrace-abi.h
ptrace.h x86: Move some signal-handling definitions to a common header 2012-02-20 12:52:04 -08:00
pvclock-abi.h
pvclock.h KVM: Fix instruction size issue in pvclock scaling 2011-08-30 14:42:30 +03:00
reboot.h x86, nmi: Wire up NMI handlers to new routines 2011-10-10 06:56:57 +02:00
reboot_fixups.h
required-features.h
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h x86: Use xadd helper more widely 2011-08-29 13:44:12 -07:00
scatterlist.h
seccomp.h
seccomp_32.h
seccomp_64.h
sections.h
segment.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
sembuf.h
serial.h
serpent.h crypto: serpent - add 4-way parallel i586/SSE2 assembler implementation 2011-11-21 16:13:23 +08:00
setup.h x86/intel config: Revamp configuration to allow for Moorestown and Medfield 2011-12-18 09:17:02 +01:00
setup_arch.h
shmbuf.h
shmparam.h
sigcontext.h x86-64: Use explicit sizes in sigcontext.h, prepare for x32 2012-02-20 12:48:46 -08:00
sigcontext32.h
sigframe.h x32: Add rt_sigframe_x32 2012-02-20 12:52:05 -08:00
sighandling.h x32: Export setup/restore_sigcontext from signal.c 2012-02-20 12:52:04 -08:00
siginfo.h
signal.h
smp.h x86, NMI: Add NMI IPI selftest 2011-12-05 12:00:16 +01:00
smpboot_hooks.h
socket.h
sockios.h
sparsemem.h
special_insns.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
spinlock.h x86/spinlocks: Eliminate TICKET_MASK 2012-02-07 10:09:54 +01:00
spinlock_types.h x86/spinlocks: Eliminate TICKET_MASK 2012-02-07 10:09:54 +01:00
stackprotector.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
stacktrace.h
stat.h
statfs.h
string.h
string_32.h
string_64.h
suspend.h
suspend_32.h
suspend_64.h
svm.h
swab.h
swiotlb.h
switch_to.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
sync_bitops.h
sys_ia32.h x86: Add #ifdef CONFIG_COMPAT to <asm/sys_ia32.h> 2012-02-20 12:52:05 -08:00
syscall.h x32: Handle the x32 system call flag 2012-02-20 12:52:05 -08:00
syscalls.h
tce.h
termbits.h
termios.h
thread_info.h Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
time.h
timer.h sched/x86: Fix overflow in cyc2ns_offset 2012-03-13 16:27:51 +01:00
timex.h
tlb.h
tlbflush.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
topology.h Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
trampoline.h
traps.h x86: Use enum instead of literals for trap values 2012-03-09 16:47:54 -08:00
tsc.h x86: kvmclock: abstract save/restore sched_clock_state 2012-03-20 12:37:45 +02:00
types.h
uaccess.h x86-64: Set siginfo and context on vsyscall emulation faults 2011-12-05 12:17:27 +01:00
uaccess_32.h
uaccess_64.h
ucontext.h
unaligned.h
unistd.h x32: Handle the x32 system call flag 2012-02-20 12:52:05 -08:00
user.h
user32.h
user_32.h
user_64.h
vdso.h
vga.h
vgtod.h x86-64: Simplify and optimize vdso clock_gettime monotonic variants 2012-03-23 16:49:33 -07:00
virtext.h Disintegrate asm/system.h for X86 2012-03-28 18:11:12 +01:00
vm86.h
vmx.h KVM: APIC: avoid instruction emulation for EOI writes 2011-09-25 19:52:17 +03:00
vsyscall.h x86-64: Rework vsyscall emulation and add vsyscall= parameter 2011-08-10 19:26:46 -05:00
vvar.h
x2apic.h x86/apic: Add separate apic_id_valid() functions for selected apic drivers 2012-03-23 13:28:43 +01:00
x86_init.h x86: kvmclock: abstract save/restore sched_clock_state 2012-03-20 12:37:45 +02:00
xcr.h
xor.h
xor_32.h
xor_64.h
xsave.h