Andy Lutomirski fd143b210e x86, entry: Only call user_exit if TIF_NOHZ ...

The RCU context tracking code requires that arch code call
user_exit() on any entry into kernel code if TIF_NOHZ is set.  This
patch adds a check for TIF_NOHZ and a comment to the syscall entry
tracing code.

The main purpose of this patch is to make the code easier to follow:
one can read the body of user_exit and of every function it calls
without finding any explanation of why it's called for traced
syscalls but not for untraced syscalls.  This makes it clear when
user_exit() is necessary.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/0b13e0e24ec0307d67ab7a23b58764f6b1270116.1409954077.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2014-09-08 14:13:59 -07:00

..

acpi

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

2014-08-13 18:23:32 -06:00

apic

x86, irq, PCI: Keep IRQ assignment for runtime power management

2014-08-29 13:38:00 +02:00

cpu

Merge tag 'pci-v3.17-changes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

2014-08-14 18:10:33 -06:00

kprobes

kprobes/x86: Don't try to resolve kprobe faults from userspace

2014-07-16 14:16:32 +02:00

.gitignore

…

alternative.c

kprobes, x86: Allow kprobes on text_poke/hw_breakpoint

2014-04-24 10:03:02 +02:00

amd_gart_64.c

x86: enable DMA CMA with swiotlb

2014-06-04 16:53:57 -07:00

amd_nb.c

Merge tag 'edac_for_3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp

2014-04-01 13:54:00 -07:00

apb_timer.c

intel_mid: Renamed *mrst* to *intel_mid*

2013-10-17 16:40:47 -07:00

aperture_64.c

x86/gart: Tidy messages and add bridge device info

2014-05-23 10:47:19 -06:00

apm_32.c

x86: Remove unused variable "polling"

2014-07-16 12:58:47 +02:00

asm-offsets_32.c

x86: Get rid of ->hard_math and all the FPU asm fu

2013-06-06 14:32:04 -07:00

asm-offsets_64.c

x86, gdt, hibernate: Store/load GDT for hibernate path.

2013-05-02 11:27:35 -07:00

asm-offsets.c

sched, x86: Provide a per-cpu preempt_count implementation

2013-09-25 14:07:57 +02:00

audit_64.c

…

bootflag.c

…

check.c

x86/mm: memblock: switch to use NUMA_NO_NODE

2014-01-21 16:19:47 -08:00

cpuid.c

x86, cpuid: Fix CPU hotplug callback registration

2014-03-20 13:43:42 +01:00

crash_dump_32.c

x86: remove the second argument of k[un]map_atomic()

2012-03-20 21:48:15 +08:00

crash_dump_64.c

…

crash.c

kexec: create a new config option CONFIG_KEXEC_FILE for new syscall

2014-08-29 16:28:16 -07:00

devicetree.c

x86, irq, devicetree: Release IOAPIC pin when PCI device is disabled

2014-06-21 23:05:44 +02:00

doublefault.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

dumpstack_32.c

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

2014-04-01 10:17:18 -07:00

dumpstack_64.c

x86: Fix dumpstack_64 irq stack handling

2014-04-02 11:46:50 -07:00

dumpstack.c

kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation

2014-04-24 10:26:38 +02:00

e820.c

x86/mm: memblock: switch to use NUMA_NO_NODE

2014-01-21 16:19:47 -08:00

early_printk.c

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

2013-11-12 11:12:22 +09:00

early-quirks.c

Merge commit '9e9a928eed8796a0a1aaed7e0b676db86ba84594' into drm-next

2014-06-05 20:28:59 +10:00

entry_32.S

x86_32, entry: Clean up sysenter_badsys declaration

2014-08-15 13:45:32 -07:00

entry_64.S

Merge branches 'x86-build-for-linus', 'x86-cleanups-for-linus' and 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-08-04 16:56:16 -07:00

espfix_64.c

x86/espfix/xen: Fix allocation of pages for paravirt page tables

2014-07-14 13:47:32 -07:00

ftrace.c

ftrace/x86: Add call to ftrace_graph_is_dead() in function graph code

2014-07-17 09:45:08 -04:00

head32.c

asmlinkage, x86: Add explicit __visible to arch/x86/*

2014-05-05 16:07:44 -07:00

head64.c

kernel/printk: use symbolic defines for console loglevels

2014-06-04 16:54:17 -07:00

head_32.S

x86: fix compile error due to X86_TRAP_NMI use in asm files

2014-03-07 18:58:40 -08:00

head_64.S

x86: fix compile error due to X86_TRAP_NMI use in asm files

2014-03-07 18:58:40 -08:00

head.c

x86: Make sure we can boot in the case the BDA contains pure garbage

2013-02-27 13:38:57 -08:00

hpet.c

Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next

2014-06-05 08:05:29 -07:00

hw_breakpoint.c

kprobes, x86: Allow kprobes on text_poke/hw_breakpoint

2014-04-24 10:03:02 +02:00

i386_ksyms_32.c

sched, x86: Optimize the preempt_schedule() call

2013-09-25 14:23:07 +02:00

i387.c

x86/xsaves: Clear reserved bits in xsave header

2014-05-29 14:33:00 -07:00

i8237.c

…

i8253.c

x86: Use common i8253 clockevent

2011-07-01 10:37:14 +02:00

i8259.c

x86, irq, pic: Probe for legacy PIC and set legacy_pic appropriately

2014-04-14 11:49:55 -07:00

io_delay.c

…

ioport.c

x86: get rid of pt_regs argument of iopl(2)

2013-02-03 18:16:24 -05:00

iosf_mbi.c

PCI: Remove DEFINE_PCI_DEVICE_TABLE macro use

2014-08-12 12:15:14 -06:00

irq_32.c

x86, threadinfo: Redo "x86: Use inline assembler to get sp"

2014-03-10 17:32:01 -07:00

irq_64.c

irq: Consolidate do_softirq() arch overriden implementations

2013-10-01 12:53:25 +02:00

irq_work.c

x86, asmlinkage: Make all interrupt handlers asmlinkage / __visible

2013-08-06 14:18:23 -07:00

irq.c

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

2014-06-12 20:03:47 -07:00

irqinit.c

x86: Fix non-PC platform kernel crash on boot due to NULL dereference

2014-08-25 22:36:57 +02:00

jump_label.c

x86/jump_label: expect default_nop if static_key gets enabled on boot-up

2013-10-19 19:45:35 -04:00

kdebugfs.c

arch/x86/kernel/kdebugfs.c: Ensure a consistent return value in error case

2012-07-26 15:07:20 +02:00

kexec-bzimage64.c

kexec: verify the signature of signed PE bzImage

2014-08-08 15:57:33 -07:00

kgdb.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

ksysfs.c

x86: ksysfs.c build fix

2014-01-03 14:37:13 +00:00

kvm.c

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

2014-06-12 19:18:49 -07:00

kvmclock.c

kvm: remove redundant registration of BSP's hv_clock area

2014-02-22 15:53:32 +01:00

ldt.c

Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime option"

2014-05-21 10:22:59 -07:00

machine_kexec_32.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

machine_kexec_64.c

kexec: create a new config option CONFIG_KEXEC_FILE for new syscall

2014-08-29 16:28:16 -07:00

Makefile

kexec: create a new config option CONFIG_KEXEC_FILE for new syscall

2014-08-29 16:28:16 -07:00

mcount_64.S

ftrace: x86: Remove check of obsolete variable function_trace_stop

2014-07-18 13:57:02 -04:00

mmconf-fam10h_64.c

x86: delete __cpuinit usage from all x86 files

2013-07-14 19:36:56 -04:00

module.c

x86, kaslr: fix module lock ordering problem

2014-03-24 10:18:26 -07:00

mpparse.c

x86, apic: Remove mps_oem_check callback

2014-07-31 08:05:42 -07:00

msr.c

x86, msr: Fix CPU hotplug callback registration

2014-03-20 13:43:42 +01:00

nmi_selftest.c

x86/nmi: Clean up register_nmi_handler() usage

2012-06-20 14:23:17 +02:00

nmi.c

kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation

2014-04-24 10:26:38 +02:00

paravirt_patch_32.c

…

paravirt_patch_64.c

x86_64/entry/xen: Do not invoke espfix64 on Xen

2014-07-28 15:25:40 -07:00

paravirt-spinlocks.c

x86, ticketlock: Add slowpath logic

2013-08-09 07:54:00 -07:00

paravirt.c

kprobes, x86: Prohibit probing on native_set_debugreg()/load_idt()

2014-04-24 10:02:58 +02:00

pci-calgary_64.c

x86, calgary: Use 8M TCE table size by default

2014-04-10 19:51:32 -07:00

pci-dma.c

arch/x86/kernel/pci-dma.c: fix dma_generic_alloc_coherent() when CONFIG_DMA_CMA is enabled

2014-06-04 16:53:57 -07:00

pci-iommu_table.c

…

pci-nommu.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

pci-swiotlb.c

x86: enable DMA CMA with swiotlb

2014-06-04 16:53:57 -07:00

pcspeaker.c

…

perf_regs.c

perf: Fix off by one test in perf_reg_value()

2012-09-19 17:08:40 +02:00

pmc_atom.c

x86/pmc_atom: Silence shift wrapping warnings in pmc_sleep_tmr_show()

2014-08-02 16:52:17 -07:00

preempt.S

sched, x86: Optimize the preempt_schedule() call

2013-09-25 14:23:07 +02:00

probe_roms.c

x86/pci/probe_roms: Add missing __iomem annotation to pci_map_biosrom()

2012-09-05 10:52:25 +02:00

process_32.c

x86: Keep thread_info on thread stack in x86_32

2014-03-06 16:56:55 -08:00

process_64.c

Merge branch 'perf/urgent' into perf/core, to resolve conflict and to prepare for new patches

2014-06-06 07:55:06 +02:00

process.c

Define kernel API to get address of each state in xsave area

2014-05-29 14:33:09 -07:00

ptrace.c

x86, entry: Only call user_exit if TIF_NOHZ

2014-09-08 14:13:59 -07:00

pvclock.c

hung_task: add method to reset detector

2013-11-06 09:49:02 +02:00

quirks.c

x86/amd/numa: Fix northbridge quirk to assign correct NUMA node

2014-03-14 11:05:36 +01:00

reboot_fixups_32.c

…

reboot.c

x86/reboot: Add EFI reboot quirk for ACPI Hardware Reduced flag

2014-07-18 21:23:52 +01:00

relocate_kernel_32.S

x86, asm, cleanup: Replace open-coded control register values with symbolic

2013-06-25 16:26:06 -07:00

relocate_kernel_64.S

x86, reloc: Use xorl instead of xorq in relocate_kernel_64.S

2013-06-20 21:30:04 -07:00

resource.c

x86: don't exclude low BIOS area when allocating address space for non-PCI cards

2014-07-16 12:29:36 -06:00

rtc.c

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

2013-11-12 11:12:22 +09:00

setup_percpu.c

x86: Add read_mostly declaration/definition to variables from smp.h

2012-06-14 12:42:11 +02:00

setup.c

arch/x86: Replace plain strings with constants

2014-07-18 21:23:59 +01:00

signal.c

x86_32, signal: Fix vdso rt_sigreturn

2014-06-23 15:54:42 -07:00

smp.c

asmlinkage, x86: Add explicit __visible to arch/x86/*

2014-05-05 16:07:44 -07:00

smpboot.c

x86, apic: Remove setup_portio_remap callback

2014-07-31 08:05:44 -07:00

stacktrace.c

x86: Swap save_stack_trace_regs parameters

2011-06-14 22:48:51 -04:00

step.c

ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL

2013-01-22 10:08:00 -08:00

sys_x86_64.c

x86 get_unmapped_area: Access mmap_legacy_base through mm_struct member

2013-08-22 10:19:35 -07:00

syscall_32.c

x86, asmlinkage: Make syscall tables visible

2013-08-06 14:20:18 -07:00

syscall_64.c

x86, asmlinkage: Make syscall tables visible

2013-08-06 14:20:18 -07:00

sysfb_efi.c

x86: sysfb: move EFI quirks from efifb to sysfb

2013-08-02 16:17:47 -07:00

sysfb_simplefb.c

x86/simplefb: Mark framebuffer mem-resources as IORESOURCE_BUSY to avoid bootup warning

2013-10-03 07:51:11 +02:00

sysfb.c

x86: sysfb: move EFI quirks from efifb to sysfb

2013-08-02 16:17:47 -07:00

tboot.c

x86 / tboot / ACPI: Fail extended mode reduced hardware sleep

2013-07-31 14:25:51 +02:00

tce_64.c

Disintegrate asm/system.h for X86

2012-03-28 18:11:12 +01:00

test_nx.c

…

test_rodata.c

x86, extable: Remove open-coded exception table entries in arch/x86/kernel/test_rodata.c

2012-04-20 13:51:38 -07:00

time.c

x86: Fix non-PC platform kernel crash on boot due to NULL dereference

2014-08-25 22:36:57 +02:00

tls.c

make SYSCALL_DEFINE<n>-generated wrappers do asmlinkage_protect

2013-03-03 22:58:33 -05:00

tls.h

…

topology.c

hotplug, powerpc, x86: Remove cpu_hotplug_driver_lock()

2013-09-30 19:55:51 +02:00

trace_clock.c

tracing,x86: Add a TSC trace_clock

2012-11-13 15:48:27 -05:00

tracepoint.c

x86: Make sure IDT is page aligned

2013-07-16 15:14:48 -07:00

traps.c

x86/kprobes: Fix build errors and blacklist context_track_user

2014-06-14 09:07:44 +02:00

tsc_msr.c

x86: tsc: Add missing Baytrail frequency to the table

2014-02-19 17:12:24 +01:00

tsc_sync.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

tsc.c

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

2014-08-05 17:46:42 -07:00

uprobes.c

uprobes/x86: Rename arch_uprobe->def to ->defparam, minor comment updates

2014-06-05 16:21:57 +02:00

verify_cpu.S

…

vm86_32.c

x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...)

2013-05-02 20:36:32 -04:00

vmlinux.lds.S

x86, vdso: Zero-pad the VVAR page

2014-03-18 12:52:44 -07:00

vsmp_64.c

x86/apic/vsmp: Make is_vsmp_box() static

2014-08-01 15:09:45 -07:00

vsyscall_64.c

seccomp,x86,arm,mips,s390: Remove nr parameter from secure_computing

2014-09-03 14:58:17 -07:00

vsyscall_emu_64.S

x86-64: Rework vsyscall emulation and add vsyscall= parameter

2011-08-10 19:26:46 -05:00

vsyscall_gtod.c

timekeeping: Create struct tk_read_base and use it in struct timekeeper

2014-07-23 15:01:53 -07:00

vsyscall_trace.h

x86-64: Add vsyscall:emulate_vsyscall trace event

2011-08-04 16:13:53 -07:00

x86_init.c

PCI: Drop "irq" param from *_restore_msi_irqs()

2013-12-13 08:44:30 -07:00

x8664_ksyms_64.c

sched, x86: Optimize the preempt_schedule() call

2013-09-25 14:23:07 +02:00

xsave.c

x86/xsaves: Clean up code in xstate offsets computation in xsave area

2014-05-30 17:12:41 -07:00