Tejun Heo ccbeed3a05 x86: make lazy %gs optional on x86_32 ...

Impact: pt_regs changed, lazy gs handling made optional, add slight
        overhead to SAVE_ALL, simplifies error_code path a bit

On x86_32, %gs hasn't been used by kernel and handled lazily.  pt_regs
doesn't have place for it and gs is saved/loaded only when necessary.
In preparation for stack protector support, this patch makes lazy %gs
handling optional by doing the followings.

* Add CONFIG_X86_32_LAZY_GS and place for gs in pt_regs.

* Save and restore %gs along with other registers in entry_32.S unless
  LAZY_GS.  Note that this unfortunately adds "pushl $0" on SAVE_ALL
  even when LAZY_GS.  However, it adds no overhead to common exit path
  and simplifies entry path with error code.

* Define different user_gs accessors depending on LAZY_GS and add
  lazy_save_gs() and lazy_load_gs() which are noop if !LAZY_GS.  The
  lazy_*_gs() ops are used to save, load and clear %gs lazily.

* Define ELF_CORE_COPY_KERNEL_REGS() which always read %gs directly.

xen and lguest changes need to be verified.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Ingo Molnar <mingo@elte.hu>

2009-02-10 00:42:00 +01:00

..

acpi

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

cpu

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

.gitignore

arch/x86/kernel/.gitignore: Added vmlinux.lds to .gitignore file because it shouldn't be tracked.

2008-07-10 10:13:51 -07:00

alternative.c

x86: improve UP kernel when CPU-hotplug and SMP is enabled

2008-10-13 10:33:46 +02:00

amd_iommu_init.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu

2009-01-03 12:03:52 -08:00

amd_iommu.c

AMD IOMMU: remove now unnecessary #ifdefs

2009-01-03 16:44:15 +01:00

aperture_64.c

aperture_64.c: clarify that too small aperture is valid reason for this code

2008-11-28 15:24:39 +01:00

apic.c

Merge commit 'v2.6.29-rc4' into core/percpu

2009-02-09 14:58:11 +01:00

apm_32.c

x86: update Alan Cox's email addresses

2009-01-05 15:19:16 +01:00

asm-offsets_32.c

x86: make lazy %gs optional on x86_32

2009-02-10 00:42:00 +01:00

asm-offsets_64.c

x86: remove pda.h

2009-01-20 12:29:20 +09:00

asm-offsets.c

…

audit_64.c

…

bios_uv.c

x86: bios_uv.c: uv_systab should be static

2008-12-29 22:08:28 -08:00

bootflag.c

…

check.c

x86: corruption-check: some post-move cleanups

2008-10-27 18:09:45 +01:00

cpuid.c

Merge branch 'cpus4096-for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-01-03 12:04:39 -08:00

crash_dump_32.c

kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

2008-10-20 08:52:39 -07:00

crash_dump_64.c

kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

2008-10-20 08:52:39 -07:00

crash.c

x86: smp.h move safe_smp_processor_id declartion to cpu.h

2009-01-07 21:48:25 +01:00

doublefault_32.c

x86: fix virt_addr_valid() with CONFIG_DEBUG_VIRTUAL=y, v2

2008-10-13 10:33:15 +02:00

ds.c

x86, ds, bts: cleanup/fix DS configuration

2009-01-22 14:35:00 +01:00

dumpstack_32.c

ftrace: print real return in dumpstack for function graph

2008-12-03 08:56:25 +01:00

dumpstack_64.c

x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit.

2009-01-19 00:38:58 +09:00

dumpstack.c

ftrace: print real return in dumpstack for function graph

2008-12-03 08:56:25 +01:00

dumpstack.h

ftrace: print real return in dumpstack for function graph

2008-12-03 08:56:25 +01:00

e820.c

Merge branch 'linus' into release

2009-01-09 03:39:43 -05:00

early_printk.c

x86: early_printk - use sizeof instead of hardcoded number

2009-01-02 10:27:46 +01:00

early-quirks.c

x86: only scan the root bus in early PCI quirks

2009-01-09 12:46:22 -08:00

efi_32.c

x86: fix i486 suspend to disk CR4 oops

2008-08-18 08:50:19 +02:00

efi_64.c

x86: remove include of apic.h from hardirq_64.h

2009-01-23 11:03:29 +09:00

efi_stub_32.S

…

efi_stub_64.S

…

efi.c

x86: make UV support configurable

2009-01-21 13:00:42 +01:00

entry_32.S

x86: make lazy %gs optional on x86_32

2009-02-10 00:42:00 +01:00

entry_64.S

Merge commit 'v2.6.29-rc4' into core/percpu

2009-02-09 14:58:11 +01:00

es7000_32.c

Merge branch 'linus' into x86/quirks

2008-12-08 15:07:49 +01:00

ftrace.c

tracing/function-graph-tracer: append the tracing_graph_flag

2008-12-08 15:11:45 +01:00

genapic_64.c

x86: make UV support configurable

2009-01-21 13:00:42 +01:00

genapic_flat_64.c

x86: fix cpu_mask_to_apicid_and to include cpu_online_mask

2008-12-18 11:59:24 +01:00

genx2apic_cluster.c

x86: use logical apicid in x2apic_cluster's x2apic_cpu_mask_to_apicid_and()

2008-12-23 22:37:30 +01:00

genx2apic_phys.c

Merge branch 'linus' into x86/cleanups

2009-01-02 22:41:36 +01:00

genx2apic_uv_x.c

x86: uv cleanup

2009-01-21 17:26:06 +09:00

geode_32.c

x86, geode: add a VSA2 ID for General Software

2008-06-19 14:19:03 +02:00

head32.c

x86: change static allocation of trampoline area

2008-12-08 13:49:45 +01:00

head64.c

x86: remove pda_init()

2009-01-20 12:29:19 +09:00

head_32.S

x86: set %fs to __KERNEL_PERCPU unconditionally for x86_32

2009-01-21 17:26:05 +09:00

head_64.S

x86: use linker to offset symbols by __per_cpu_load

2009-02-09 10:30:30 +01:00

head.c

x86, debug: remove EBDA debug printk

2008-12-12 11:08:42 +01:00

hpet.c

debugobjects: add and use INIT_WORK_ON_STACK

2009-01-22 10:02:07 +01:00

i386_ksyms_32.c

ftrace: rename FTRACE to FUNCTION_TRACER

2008-10-20 18:27:03 +02:00

i387.c

x86: fix __cpuinit/__init tangle in init_thread_xstate()

2008-11-20 16:43:41 +01:00

i8237.c

…

i8253.c

cpumask: convert struct clock_event_device to cpumask pointers.

2008-12-13 21:20:26 +10:30

i8259.c

x86: i8259.c fix style problems

2009-01-04 18:19:37 +01:00

init_task.c

take init_fs to saner place

2008-12-31 18:07:42 -05:00

io_apic.c

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

io_delay.c

x86: add io delay quirk for Presario F700

2008-09-03 16:42:51 -07:00

ioport.c

x86: ioport.c fix style problems

2009-01-04 13:23:07 +01:00

ipi.c

x86: cosmetic changes apic-related files.

2008-12-16 17:40:57 -08:00

irq_32.c

cpumask: update irq_desc to use cpumask_var_t

2009-01-11 19:12:46 +01:00

irq_64.c

x86: remove include of apic.h from hardirq_64.h

2009-01-23 11:03:29 +09:00

irq.c

x86-64: Move irq stats from PDA to per-cpu and consolidate with 32-bit.

2009-01-19 00:38:57 +09:00

irqinit_32.c

Merge commit 'v2.6.29-rc4' into core/percpu

2009-02-09 14:58:11 +01:00

irqinit_64.c

x86: irqinit_64.c init_ISA_irqs should be static

2009-01-04 18:19:41 +01:00

k8.c

x86, gart: fix gart detection for Fam11h CPUs

2008-10-28 17:10:27 +01:00

kdebugfs.c

arch/x86/kernel/kdebugfs.c: introduce missing kfree

2008-09-10 14:03:49 +02:00

kgdb.c

kgdb, x86: Avoid invoking kgdb_nmicallback twice per NMI

2008-10-06 13:50:59 -05:00

kprobes.c

kprobes: check CONFIG_FREEZER instead of CONFIG_PM

2009-01-16 14:32:17 -05:00

kvm.c

x86, paravirt_ops: use unsigned long instead of u32 for alloc_p*() pfn args

2008-08-22 05:34:44 +02:00

kvmclock.c

x86: KVM guest: kvm_get_tsc_khz: return khz, not lpj

2008-12-31 16:55:44 +02:00

ldt.c

x86: ldt.c fix style problems

2009-01-02 17:46:24 +01:00

machine_kexec_32.c

kexec/i386: setup kexec page table in C

2008-10-31 10:01:57 +01:00

machine_kexec_64.c

kexec jump

2008-07-26 12:00:04 -07:00

Makefile

x86: initialize per-cpu GDT segment in per-cpu setup

2009-01-27 12:56:48 +09:00

mca_32.c

x86: coding style fixes to arch/x86/kernel/mca_32.c

2008-04-17 17:40:49 +02:00

mfgpt_32.c

trivial: fix then -> than typos in comments and documentation

2009-01-06 11:28:06 +01:00

microcode_amd.c

x86: fix warning in arch/x86/kernel/microcode_amd.c

2008-12-19 01:31:54 +01:00

microcode_core.c

Merge branches 'x86/apic', 'x86/cleanups', 'x86/cpufeature', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/detect-hyper', 'x86/doc', 'x86/dumpstack', 'x86/early-printk', 'x86/fpu', 'x86/idle', 'x86/io', 'x86/memory-corruption-check', 'x86/microcode', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/pat2', 'x86/pci-ioapic-boot-irq-quirks', 'x86/ptrace', 'x86/quirks', 'x86/reboot', 'x86/setup-memory', 'x86/signal', 'x86/sparse-fixes', 'x86/time', 'x86/uv' and 'x86/xen' into x86/core

2008-12-23 16:27:23 +01:00

microcode_intel.c

x86: microcode_intel.c fix style problems

2009-01-12 11:22:40 +01:00

mmconf-fam10h_64.c

x86, pci: move arch/x86/pci/pci.h to arch/x86/include/asm/pci_x86.h

2008-12-29 18:17:36 +01:00

module_32.c

x86: module_32.c fix style problems

2009-01-12 11:22:55 +01:00

module_64.c

x86: module_64.c fix style problems

2009-01-12 11:23:01 +01:00

mpparse.c

Merge branches 'cpus4096', 'x86/cleanups' and 'x86/urgent' into x86/percpu

2009-01-15 13:18:57 +01:00

msr.c

x86: msr.c fix style problems

2009-01-12 11:22:50 +01:00

nmi.c

x86-64: Move irq stats from PDA to per-cpu and consolidate with 32-bit.

2009-01-19 00:38:57 +09:00

numaq_32.c

x86: rename all fields of mpc_oemtable oem_X to X

2009-01-05 14:08:34 +01:00

olpc.c

x86, olpc: fix endian bug in openfirmware workaround

2008-09-24 10:29:04 +02:00

paravirt_patch_32.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt_patch_64.c

x86/pvops: add a paravirt_ident functions to allow special patching

2009-01-30 14:51:44 -08:00

paravirt-spinlocks.c

x86: remove byte locks

2009-01-20 17:14:28 +01:00

paravirt.c

x86/paravirt: use callee-saved convention for pte_val/make_pte/etc

2009-01-30 14:51:45 -08:00

pci-calgary_64.c

arch/x86/kernel/pci-calgary_64.c: change simple_strtol to simple_strtoul

2008-11-25 15:56:03 +01:00

pci-dma.c

PCI: struct device - replace bus_id with dev_name(), dev_set_name()

2009-01-07 11:12:23 -08:00

pci-gart_64.c

Documentation: move DMA-mapping.txt to Doc/PCI/

2009-01-29 18:19:29 -08:00

pci-nommu.c

x86: export pci-nommu's alloc_coherent

2008-09-25 11:02:25 +02:00

pci-swiotlb_64.c

Merge branch 'core/iommu' into core/urgent

2009-01-05 14:17:24 +01:00

pcspeaker.c

x86: use platform_device_register_simple()

2008-09-22 12:58:36 +02:00

pmtimer_64.c

…

probe_roms_32.c

x86: seperate probe_roms into another file

2008-07-08 12:50:05 +02:00

process_32.c

x86: make lazy %gs optional on x86_32

2009-02-10 00:42:00 +01:00

process_64.c

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

process.c

x86: add clflush before monitor for Intel 7400 series

2009-02-09 11:15:15 +01:00

ptrace.c

x86: make lazy %gs optional on x86_32

2009-02-10 00:42:00 +01:00

pvclock.c

x86: pvclock: fix shadowed variable warning

2008-10-15 14:25:14 +02:00

quirks.c

x86: enable HPET on Fujitsu u9200

2008-12-16 20:36:44 +01:00

reboot_fixups_32.c

x86: constify data in reboot.c

2008-05-25 08:58:30 +02:00

reboot.c

x86: smp.h move safe_smp_processor_id declartion to cpu.h

2009-01-07 21:48:25 +01:00

relocate_kernel_32.S

kexec/i386: setup kexec page table in C

2008-10-31 10:01:57 +01:00

relocate_kernel_64.S

x86: relocate_kernel - use predefined macroses for page attributes

2008-04-17 17:41:29 +02:00

rtc.c

rtc: use bcd2bin/bin2bcd

2008-10-20 08:52:41 -07:00

scx200_32.c

…

setup_percpu.c

x86: pass in cpu number to switch_to_new_gdt()

2009-01-31 14:28:50 +09:00

setup.c

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

signal.c

x86: add %gs accessors for x86_32

2009-02-10 00:41:58 +01:00

smp.c

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-01-10 06:13:09 -08:00

smpboot.c

x86: pass in cpu number to switch_to_new_gdt()

2009-01-31 14:28:50 +09:00

stacktrace.c

tracing/stack-tracer: fix style issues

2008-11-23 11:53:48 +01:00

step.c

x86 ptrace: user-sets-TF nits

2008-07-16 12:15:17 -07:00

summit_32.c

x86: mach_summit to summit

2008-07-26 16:31:35 +02:00

sys_i386_32.c

x86: Introducing asm/syscalls.h

2008-07-22 14:35:57 +02:00

sys_x86_64.c

Merge branches 'x86/alternatives', 'x86/cleanups', 'x86/commandline', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/doc', 'x86/exports', 'x86/fpu', 'x86/gart', 'x86/idle', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/oprofile', 'x86/paravirt', 'x86/reboot', 'x86/sparse-fixes', 'x86/tsc', 'x86/urgent' and 'x86/vmalloc' into x86-v28-for-linus-phase1

2008-10-06 18:17:07 +02:00

syscall_64.c

x86: Fix ASM_X86__ header guards

2008-10-22 22:55:23 -07:00

syscall_table_32.S

[CVE-2009-0029] Rename old_readdir to sys_old_readdir

2009-01-14 14:15:15 +01:00

tce_64.c

…

test_nx.c

x86: Explicitly include required header files.

2008-04-17 17:41:15 +02:00

test_rodata.c

…

time_32.c

x86: time_32.c fix style problems

2009-01-04 13:23:05 +01:00

time_64.c

x86: time_64.c fix style problems

2009-01-04 13:23:05 +01:00

tlb_uv.c

x86: UV fix uv_flush_send_and_wait()

2009-01-31 14:23:37 +09:00

tls.c

x86: Introducing asm/syscalls.h

2008-07-22 14:35:57 +02:00

tls.h

…

topology.c

…

trampoline_32.S

x86: trampoline_32.S - switch to .cpuinit.data

2008-04-26 17:35:47 +02:00

trampoline_64.S

x86: move suspend wakeup code to C

2008-04-17 17:41:37 +02:00

trampoline.c

x86: change static allocation of trampoline area

2008-12-08 13:49:45 +01:00

traps.c

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

tsc_sync.c

Merge branches 'x86/apic', 'x86/cleanups', 'x86/cpufeature', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/detect-hyper', 'x86/doc', 'x86/dumpstack', 'x86/early-printk', 'x86/fpu', 'x86/idle', 'x86/io', 'x86/memory-corruption-check', 'x86/microcode', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/pat2', 'x86/pci-ioapic-boot-irq-quirks', 'x86/ptrace', 'x86/quirks', 'x86/reboot', 'x86/setup-memory', 'x86/signal', 'x86/sparse-fixes', 'x86/time', 'x86/uv' and 'x86/xen' into x86/core

2008-12-23 16:27:23 +01:00

tsc.c

Merge branches 'x86/apic', 'x86/cleanups', 'x86/cpufeature', 'x86/crashdump', 'x86/debug', 'x86/defconfig', 'x86/detect-hyper', 'x86/doc', 'x86/dumpstack', 'x86/early-printk', 'x86/fpu', 'x86/idle', 'x86/io', 'x86/memory-corruption-check', 'x86/microcode', 'x86/mm', 'x86/mtrr', 'x86/nmi-watchdog', 'x86/pat2', 'x86/pci-ioapic-boot-irq-quirks', 'x86/ptrace', 'x86/quirks', 'x86/reboot', 'x86/setup-memory', 'x86/signal', 'x86/sparse-fixes', 'x86/time', 'x86/uv' and 'x86/xen' into x86/core

2008-12-23 16:27:23 +01:00

uv_irq.c

x86, UV: add uv_setup_irq() and uv_teardown_irq() functions, v3, fix

2008-10-16 16:53:13 +02:00

uv_sysfs.c

x86: Add sysfs entries for UV v4

2008-10-16 16:53:13 +02:00

verify_cpu_64.S

…

visws_quirks.c

x86: rename all fields of mpc_cpu mpc_X to X

2009-01-05 14:08:33 +01:00

vm86_32.c

x86: add %gs accessors for x86_32

2009-02-10 00:41:58 +01:00

vmi_32.c

Merge branch 'x86/urgent' into core/percpu

2009-02-10 00:41:02 +01:00

vmiclock_32.c

cpumask: convert struct clock_event_device to cpumask pointers.

2008-12-13 21:20:26 +10:30

vmlinux_32.lds.S

x86: make vmlinux_32.lds.S use PERCPU() macro

2009-01-16 14:19:09 +01:00

vmlinux_64.lds.S

x86: use linker to offset symbols by __per_cpu_load

2009-02-09 10:30:30 +01:00

vmlinux.lds.S

…

vsmp_64.c

x86/paravirt: add register-saving thunks to reduce caller register pressure

2009-01-30 14:51:45 -08:00

vsyscall_64.c

Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2008-12-28 12:21:10 -08:00

x8664_ksyms_64.c

x86: convert pda ops to wrappers around x86 percpu accessors

2009-01-16 14:20:22 +01:00

xsave.c

x86: xsave.c: restore_user_xstate should be static

2008-12-30 13:31:41 -08:00