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Roland Dreier dbee8a0aff x86: remove 32-bit versions of readq()/writeq() 
The presense of a writeq() implementation on 32-bit x86 that splits the
64-bit write into two 32-bit writes turns out to break the mpt2sas driver
(and in general is risky for drivers as was discussed in
<http://lkml.kernel.org/r/adaab6c1h7c.fsf@cisco.com>).  To fix this,
revert 2c5643b1c5 ("x86: provide readq()/writeq() on 32-bit too") and
follow-on cleanups.

This unfortunately leads to pushing non-atomic definitions of readq() and
write() to various x86-only drivers that in the meantime started using the
definitions in the x86 version of <asm/io.h>.  However as discussed
exhaustively, this is actually the right thing to do, because the right
way to split a 64-bit transaction is hardware dependent and therefore
belongs in the hardware driver (eg mpt2sas needs a spinlock to make sure
no other accesses occur in between the two halves of the access).

Build tested on 32- and 64-bit x86 allmodconfig.

Link: http://lkml.kernel.org/r/x86-32-writeq-is-broken@mdm.bga.com
Acked-by: Hitoshi Mitake <h.mitake@gmail.com>
Cc: Kashyap Desai <Kashyap.Desai@lsi.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ravi Anand <ravi.anand@qlogic.com>
Cc: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Jason Uhlenkott <juhlenko@akamai.com>
Acked-by: James Bottomley <James.Bottomley@parallels.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-25 08:39:44 -07:00
..
uv x86: Fix UV BAU for non-consecutive nasids 2011-05-12 23:45:42 +02:00
visws
xen xen/p2m/m2p/gnttab: Support GNTMAP_host_map in the M2P override. 2011-04-18 11:10:27 -04:00
a.out-core.h
a.out.h
acpi.h x86, NUMA: trivial cleanups 2011-05-02 14:18:52 +02:00
aes.h
agp.h
alternative-asm.h x86, alternative: Add altinstruction_entry macro 2011-05-17 15:40:25 -07:00
alternative.h Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-05-19 17:55:12 -07:00
amd_iommu_proto.h x86/amd-iommu: Use threaded interupt handler 2011-05-10 11:07:58 +02:00
amd_iommu_types.h Merge branches 'dma-debug/next', 'amd-iommu/command-cleanups', 'amd-iommu/ats' and 'amd-iommu/extended-features' into iommu/2.6.40 2011-05-10 10:25:23 +02:00
amd_iommu.h Merge branch 'x86-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-10-21 14:23:48 -07:00
amd_nb.h x86, NUMA: trivial cleanups 2011-05-02 14:18:52 +02:00
apb_timer.h x86, cleanup: Remove obsolete boot_cpu_id variable 2010-08-12 14:01:38 -07:00
apic.h x86, apic: Make apic drivers static 2011-05-22 11:48:04 +02:00
apicdef.h x86, apic: Fix spurious error interrupts triggering on all non-boot APs 2011-05-16 13:48:25 +02:00
apm.h
arch_hweight.h x86, hweight: Use a 32-bit popcnt for __arch_hweight32() 2010-05-17 15:17:16 -07:00
asm-offsets.h
asm.h
atomic64_32.h
atomic64_64.h Merge branch 'x86-atomic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:40:05 -07:00
atomic.h Merge branch 'x86-atomic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-05-18 08:40:05 -07:00
auxvec.h
bios_ebda.h x86: Better comments for get_bios_ebda() 2011-04-29 14:13:15 -07:00
bitops.h bitops: remove minix bitops from asm/bitops.h 2011-03-23 19:46:22 -07:00
bitsperlong.h
boot.h x86: support XZ-compressed kernel 2011-01-13 08:03:25 -08:00
bootparam.h x86: Add device tree support 2011-02-23 22:27:52 +01:00
bug.h
bugs.h
byteorder.h
cache.h Rename .data.read_mostly to .data..read_mostly. 2010-03-03 11:26:00 +01:00
cacheflush.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
calgary.h x86, iommu: Make all IOMMU's detection routines return a value. 2010-08-26 15:13:13 -07:00
calling.h x86, asm: Fix CFI macro invocations to deal with shortcomings in gas 2010-10-19 14:28:02 -07:00
ce4100.h x86: ce4100: Set pci ops via callback instead of module init 2011-03-14 15:13:23 +01:00
checksum_32.h
checksum_64.h
checksum.h
cmpxchg_32.h x86, asm: Merge cmpxchg_486_u64() and cmpxchg8b_emu() 2010-07-28 17:05:11 -07:00
cmpxchg_64.h x86, asm: Clean up and simplify <asm/cmpxchg.h> 2010-07-28 15:24:09 -07:00
cmpxchg.h
compat.h compat: Make compat_alloc_user_space() incorporate the access_ok() 2010-09-14 16:08:45 -07:00
cpu.h x86: Fix mwait_usable section mismatch 2011-02-14 12:08:28 +01:00
cpufeature.h Merge branch 'x86-smep-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-05-19 18:10:17 -07:00
cpumask.h
cputime.h
current.h
debugreg.h x86: Use this_cpu_ops to optimize code 2010-12-30 12:20:28 +01:00
delay.h
desc_defs.h
desc.h
device.h
div64.h
dma-mapping.h dma-mapping: remove dma_is_consistent API 2010-08-11 08:59:21 -07:00
dma.h x86, NUMA: Enable emulation on 32bit too 2011-05-02 17:24:48 +02:00
dmi.h
dwarf2.h x86: Use {push,pop}{l,q}_cfi in more places 2010-09-03 08:14:11 +02:00
e820.h x86: e820: Remove conditional early mapping in parse_e820_ext 2011-02-23 22:27:52 +01:00
edac.h
efi.h x86, efi: Consolidate EFI nx control 2011-05-09 12:14:29 -07:00
elf.h
emergency-restart.h
entry_arch.h x86: Allocate 32 tlb_invalidate_interrupt handler stubs 2011-02-14 13:03:08 +01:00
errno.h
fb.h
fcntl.h
fixmap.h x86: Fix Moorestown VRTC fixmap placement 2011-01-11 12:46:16 +01:00
floppy.h
frame.h x86: Use {push,pop}_cfi in more places 2011-02-28 18:06:22 +01:00
ftrace.h ftrace/x86: mcount offset calculation 2011-05-16 14:55:57 -04:00
futex.h futex: Sanitize futex ops argument types 2011-03-11 12:23:31 +01:00
gart.h x86, gart: Set DISTLBWALKPRB bit always 2011-04-18 09:26:48 -07:00
genapic.h
geode.h
gpio.h x86/gpio: Implement x86 gpio_to_irq convert function 2011-01-11 12:46:15 +01:00
hardirq.h irq_work: Add generic hardirq context callbacks 2010-10-18 19:58:50 +02:00
highmem.h mm: stack based kmap_atomic() 2010-10-26 16:52:08 -07:00
hpet.h x86: ioapic/hpet: Convert to new chip functions 2010-10-12 16:53:37 +02:00
hugetlb.h
hw_breakpoint.h x86: Fix instruction breakpoint encoding 2010-09-17 03:24:13 +02:00
hw_irq.h x86: Allocate 32 tlb_invalidate_interrupt handler stubs 2011-02-14 13:03:08 +01:00
hypertransport.h
hyperv.h x86: Clean up the hypervisor layer 2010-05-07 17:13:04 -07:00
hypervisor.h xen: HVM X2APIC support 2011-01-07 10:03:50 -05:00
i387.h x86-32, fpu: Fix FPU exception handling on non-SSE systems 2011-04-06 16:53:01 -07:00
i8253.h clocksource: convert x86 to generic i8253 clocksource 2011-05-14 10:29:48 +01:00
i8259.h x86: i8259: Convert to new irq_chip functions 2010-10-12 16:53:36 +02:00
ia32_unistd.h
ia32.h
idle.h
inat_types.h
inat.h
init.h x86: Rename e820_table_* to pgt_buf_* 2011-02-24 14:52:18 +01:00
insn.h x86: Move MAX_INSN_SIZE into asm/insn.h 2010-03-10 13:23:34 +01:00
inst.h crypto: aesni-intel - Fix another CTR build failure with gas 2.16.1 2010-03-24 21:37:57 +08:00
intel_scu_ipc.h Remove indirect read write api support. 2010-08-03 09:50:30 -04:00
io_apic.h x86, ioapic: Consolidate gsi routing info into 'struct ioapic' 2011-05-20 13:41:01 +02:00
io.h x86: remove 32-bit versions of readq()/writeq() 2011-05-25 08:39:44 -07:00
ioctl.h
ioctls.h
iomap.h mm: stack based kmap_atomic() 2010-10-26 16:52:08 -07:00
iommu_table.h x86, iommu: Update header comments with appropriate naming 2010-10-08 13:11:21 -07:00
iommu.h
ipcbuf.h
ipi.h x86: Make default_send_IPI_mask_sequence/allbutself_logical() 32bit only 2011-01-28 14:54:05 +01:00
irq_controller.h x86: dtb: Add irq domain abstraction 2011-02-23 22:27:53 +01:00
irq_regs.h
irq_remapping.h x86: Speed up the irq_remapped check in hot pathes 2010-10-12 16:53:42 +02:00
irq_vectors.h x86: Work around old gas bug 2011-03-03 12:47:08 +01:00
irq.h x86: Add device tree support 2011-02-23 22:27:52 +01:00
irqflags.h Fix IRQ flag handling naming 2010-10-07 14:08:55 +01:00
ist.h
jump_label.h jump label: Add _ASM_ALIGN for x86 and x86_64 2011-04-04 13:42:51 -04:00
Kbuild archs: replace unifdef-y with header-y 2010-08-14 22:26:51 +02:00
kdebug.h x86, dumpstack: Correct stack dump info when frame pointer is available 2011-03-18 10:51:42 +01:00
kexec.h
kgdb.h kgdb,x86: Individual register get/set for x86 2010-08-05 09:22:20 -05:00
kmap_types.h
kmemcheck.h
kprobes.h x86: Move MAX_INSN_SIZE into asm/insn.h 2010-03-10 13:23:34 +01:00
kvm_emulate.h KVM: x86 emulator: consolidate segment accessors 2011-05-22 08:47:39 -04:00
kvm_host.h KVM: VMX: Cache vmcs segment fields 2011-05-22 08:47:45 -04:00
kvm_para.h KVM: x86: Add missing inline tag to kvm_read_and_reset_pf_reason 2011-01-12 11:23:27 +02:00
kvm.h KVM: x86: XSAVE/XRSTOR live migration support 2010-08-01 10:46:37 +03:00
ldt.h
lguest_hcall.h lguest: stop using KVM hypercall mechanism 2010-04-14 21:43:56 +09:30
lguest.h
linkage.h x86: Get rid of asmregparm 2011-05-24 14:33:35 +02:00
local64.h arch: Implement local64_t 2010-06-09 11:12:36 +02:00
local.h
mach_timer.h
mach_traps.h x86, NMI: Add NMI symbol constants and rename memory parity to PCI SERR 2011-01-07 15:08:51 +01:00
math_emu.h
mc146818rtc.h
mca_dma.h
mca.h
mce.h x86, mce: Drop the default decoding notifier 2011-04-21 11:35:10 +02:00
memblock.h x86-32, memblock: Make add_highpages honor early reserved ranges 2010-10-05 21:44:35 -07:00
microcode.h x86, microcode, AMD: Cleanup code a bit 2010-11-10 14:54:54 +01:00
mman.h
mmconfig.h
mmu_context.h x86, mm: avoid possible bogus tlb entries by clearing prev mm_cpumask after switching mm 2011-02-03 13:32:39 -08:00
mmu.h x86: add context tag to mark mm when running a task in 32-bit compatibility mode 2011-03-23 16:36:52 -04:00
mmx.h
mmzone_32.h x86-32, NUMA: Replace srat_32.c with srat.c 2011-05-02 14:18:53 +02:00
mmzone_64.h x86-64, NUMA: Remove custom phys_to_nid() implementation 2011-04-01 11:15:12 +02:00
mmzone.h
module.h x86, cpu: Move AMD Elan Kconfig under "Processor family" 2011-04-08 13:01:25 -07:00
mpspec_def.h x86: Fix APIC ID sizing bug on larger systems, clean up MAX_APICS confusion 2011-01-05 14:09:23 +01:00
mpspec.h x86: Unify cpu/apicid <-> NUMA node mapping between 32 and 64bit 2011-01-28 14:54:09 +01:00
mrst-vrtc.h x86: mrst: Add vrtc driver which serves as a wall clock device 2010-11-11 11:34:27 +01:00
mrst.h x86: mrst: Add vrtc driver which serves as a wall clock device 2010-11-11 11:34:27 +01:00
msgbuf.h
mshyperv.h x86: Clean up the hypervisor layer 2010-05-07 17:13:04 -07:00
msidef.h
msr-index.h KVM: SVM: Implement infrastructure for TSC_RATE_MSR 2011-05-11 07:57:04 -04:00
msr.h x86, gcc-4.6: Avoid unused by set variables in rdmsr 2010-07-20 15:38:18 -07:00
mtrr.h
mutex_32.h
mutex_64.h
mutex.h
mwait.h x86, mwait: Move mwait constants to a common header file 2010-09-17 15:36:40 -07:00
nmi.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
nops.h x86, cpu: Clean up and unify the NOP selection infrastructure 2011-04-18 16:40:21 -07:00
numa_32.h x86, NUMA: Move NUMA init logic from numa_64.c to numa.c 2011-05-02 14:18:53 +02:00
numa_64.h x86, NUMA: Move NUMA init logic from numa_64.c to numa.c 2011-05-02 14:18:53 +02:00
numa.h x86, NUMA: Make numa_init_array() static 2011-05-02 17:24:48 +02:00
numaq.h x86-32, NUMA: Update numaq to use new NUMA init protocol 2011-05-02 14:18:53 +02:00
olpc_ofw.h x86, olpc: Use device tree for platform identification 2011-03-15 14:17:23 -07:00
olpc.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
page_32_types.h x86: Remove CONFIG_4KSTACKS 2010-06-29 12:12:59 +02:00
page_32.h
page_64_types.h
page_64.h
page_types.h x86-64, NUMA: Revert NUMA affine page table allocation 2011-03-04 10:26:36 +01:00
page.h x86: Document __phys_reloc_hide() usage in __pa_symbol() 2010-08-11 08:43:49 +02:00
param.h
paravirt_types.h thp: add pmd paravirt ops 2011-01-13 17:32:39 -08:00
paravirt.h thp: fix PARAVIRT x86 32bit noPAE 2011-01-26 10:49:57 +10:00
parport.h
pat.h
pci_64.h
pci_x86.h x86/PCI: Clean up pci_cache_line_size 2010-10-18 10:49:30 -04:00
pci-direct.h
pci-functions.h
pci.h x86/PCI: Remove dma32_reserve_bootmem 2011-05-10 15:43:32 -07:00
percpu.h Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2011-05-24 11:53:42 -07:00
perf_event_p4.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
perf_event.h perf, arch: Cleanup perf-pmu init vs lockup-detector 2010-11-26 15:14:56 +01:00
pgalloc.h tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
pgtable_32_types.h x86: use __ASSEMBLY__ rather than __ASSEMBLER__ 2010-06-07 17:27:11 -07:00
pgtable_32.h mm: remove pte_*map_nested() 2010-10-26 16:52:08 -07:00
pgtable_64_types.h
pgtable_64.h thp: add x86 32bit support 2011-01-13 17:32:44 -08:00
pgtable_types.h x86,xen: introduce x86_init.mapping.pagetable_reserve 2011-05-12 13:05:04 -04:00
pgtable-2level_types.h
pgtable-2level.h thp: add x86 32bit support 2011-01-13 17:32:44 -08:00
pgtable-3level_types.h
pgtable-3level.h x86: Flush TLB if PGD entry is changed in i386 PAE mode 2011-03-18 11:44:01 +01:00
pgtable.h thp: don't allow transparent hugepage support without PSE 2011-01-13 17:32:45 -08:00
poll.h
posix_types_32.h
posix_types_64.h
posix_types.h
prctl.h
probe_roms.h x86: Introduce pci_map_biosrom() 2011-03-15 15:34:15 -07:00
processor-cyrix.h
processor-flags.h x86, cpu: Add SMEP CPU feature in CR4 2011-05-17 21:06:42 -07:00
processor.h x86: Move llc_shared_map out of cpu_info 2011-01-26 08:44:49 +01:00
prom.h x86: dt: Cleanup local apic setup 2011-02-25 16:18:52 +01:00
proto.h
ptrace-abi.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
ptrace.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
pvclock-abi.h x86, paravirt: don't compute pvclock adjustments if we trust the tsc 2010-05-19 11:41:05 +03:00
pvclock.h x86/pvclock: Zero last_value on resume 2010-11-28 09:33:20 +01:00
reboot_fixups.h
reboot.h x86, reboot: Move the real-mode reboot code to an assembly file 2011-02-17 21:05:34 -08:00
required-features.h x86, cpu: Support the features flags in new CPUID leaf 7 2010-07-07 17:29:18 -07:00
resource.h
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h rwsem: Move duplicate function prototypes to linux/rwsem.h 2011-01-27 12:30:39 +01:00
scatterlist.h remove needless ISA_DMA_THRESHOLD 2010-08-07 18:15:50 +02:00
seccomp_32.h
seccomp_64.h
seccomp.h
sections.h
segment.h x86: Make the GDT_ENTRY() macro in <asm/segment.h> safe for assembly 2011-02-17 21:05:13 -08:00
sembuf.h
serial.h
setup_arch.h
setup.h Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-05-19 18:08:06 -07:00
shmbuf.h
shmparam.h
sigcontext32.h
sigcontext.h
sigframe.h
siginfo.h
signal.h
smp.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-03-15 19:49:10 -07:00
smpboot_hooks.h x86: Use u32 instead of long to set reset vector back to 0 2011-02-28 16:22:18 +01:00
socket.h
sockios.h
sparsemem.h
spinlock_types.h
spinlock.h
stackprotector.h
stacktrace.h x86: Remove warning and warning_symbol from struct stacktrace_ops 2011-05-12 15:31:28 +02:00
stat.h
statfs.h
string_32.h
string_64.h
string.h
suspend_32.h PM / x86: Save/restore MISC_ENABLE register 2010-06-08 00:32:49 +02:00
suspend_64.h PM / x86: Save/restore MISC_ENABLE register 2010-06-08 00:32:49 +02:00
suspend.h
svm.h KVM: SVM: copy instruction bytes from VMCB 2011-01-12 11:31:07 +02:00
swab.h
swiotlb.h x86, swiotlb: Simplify SWIOTLB pci_swiotlb_detect routine. 2010-08-26 15:13:29 -07:00
sync_bitops.h
sys_ia32.h Mark arguments to certain syscalls as being const 2010-08-13 16:53:13 -07:00
syscall.h
syscalls.h Make do_execve() take a const filename pointer 2010-08-17 18:07:43 -07:00
system.h x86: Demacro CONFIG_PARAVIRT cpu accessors 2011-04-24 13:20:36 +02:00
tce.h
termbits.h
termios.h
thread_info.h mm: NUMA aware alloc_thread_info_node() 2011-03-22 17:44:01 -07:00
time.h
timer.h x86, nmi_watchdog: Remove all stub function calls from old nmi_watchdog 2010-11-18 09:08:23 +01:00
timex.h
tlb.h
tlbflush.h x86-32, mm: Add an initial page table for core bootstrapping 2010-10-20 14:23:55 -07:00
topology.h x86, NUMA: Make 32bit use common NUMA init path 2011-05-02 17:24:48 +02:00
trampoline.h x86, trampoline: Use the unified trampoline setup for ACPI wakeup 2011-02-17 21:05:06 -08:00
traps.h KVM: Handle async PF in a guest. 2011-01-12 11:23:16 +02:00
tsc.h x86: Fix common misspellings 2011-03-18 10:39:30 +01:00
types.h remove dma64_addr_t 2011-03-23 19:47:18 -07:00
uaccess_32.h sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
uaccess_64.h sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
uaccess.h sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
ucontext.h
unaligned.h
unistd_32.h net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
unistd_64.h net: Add sendmmsg socket system call 2011-05-05 11:10:14 -07:00
unistd.h
user32.h
user_32.h
user_64.h
user.h
vdso.h
vga.h
vgtod.h
virtext.h
vm86.h
vmx.h KVM: VMX: Add definitions for more vm entry/exit control bits 2011-01-12 11:31:08 +02:00
vsyscall.h
x2apic.h x86, x2apic: Move the common bits to x2apic.h 2011-05-20 13:41:11 +02:00
x86_init.h x86,xen: introduce x86_init.mapping.pagetable_reserve 2011-05-12 13:05:04 -04:00
xcr.h
xor_32.h
xor_64.h
xor.h
xsave.h Merge branch 'x86-xsave-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-08-06 16:25:13 -07:00