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501e5bbec3c19498fa520fd3ffd68bd907f31bf7
linux/arch/x86/kernel
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Rafael J. Wysocki b29c6ef7bb x86 / CPU: Avoid unnecessary IPIs in arch_freq_get_on_cpu() 
Even though aperfmperf_snapshot_khz() caches the samples.khz value to
return if called again in a sufficiently short time, its caller,
arch_freq_get_on_cpu(), still uses smp_call_function_single() to run it
which may allow user space to trigger an IPI storm by reading from the
scaling_cur_freq cpufreq sysfs file in a tight loop.

To avoid that, move the decision on whether or not to return the cached
samples.khz value to arch_freq_get_on_cpu().

This change was part of commit 941f5f0f6e ("x86: CPU: Fix up "cpu MHz"
in /proc/cpuinfo"), but it was not the reason for the revert and it
remains applicable.

Fixes: 4815d3c56d (cpufreq: x86: Make scaling_cur_freq behave more as expected)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: WANG Chao <chao.wang@ucloud.cn>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-13 19:42:39 -08:00
..
acpi
x86/virt, x86/acpi: Add test for ACPI_FADT_NO_VGA
2017-11-10 10:03:13 +01:00
apic
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
cpu
x86 / CPU: Avoid unnecessary IPIs in arch_freq_get_on_cpu()
2017-11-13 19:42:39 -08:00
fpu
Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts
2017-11-07 10:53:06 +01:00
kprobes
Merge branch 'linus' into perf/core, to fix conflicts
2017-11-07 10:30:18 +01:00
.gitignore
…
alternative.c
kprobes, x86/alternatives: Use text_mutex to protect smp_alt_modules
2017-11-07 12:20:09 +01:00
amd_gart_64.c
x86: remove arch specific dma_supported implementation
2017-06-28 06:54:46 -07:00
amd_nb.c
x86/cpu/AMD: Apply the Erratum 688 fix when the BIOS doesn't
2017-10-22 13:06:02 +02:00
apb_timer.c
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-25 14:30:04 -08:00
aperture_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
apm_32.c
dmi: Mark all struct dmi_system_id instances const
2017-09-14 11:59:30 +02:00
asm-offsets_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
asm-offsets_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
asm-offsets.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
audit_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
bootflag.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
check.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cpuid.c
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-12-12 19:25:04 -08:00
crash_dump_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash_dump_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
crash.c
resource: Fix resource_size.cocci warnings
2017-11-07 20:44:56 +01:00
devicetree.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
doublefault.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dumpstack_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dumpstack_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
dumpstack.c
x86/asm/32: Remove a bunch of '& 0xffff' from pt_regs segment reads
2017-07-30 12:04:41 +02:00
e820.c
x86/boot/e820: Add support to determine the E820 type of an address
2017-07-18 11:38:01 +02:00
early_printk.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
early-quirks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ebda.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
eisa.c
x86/eisa: Add missing include
2017-08-31 21:34:48 +02:00
espfix_64.c
locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
2017-10-25 11:01:08 +02:00
ftrace_32.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ftrace_64.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ftrace.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
head_32.S
Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts
2017-11-07 10:53:06 +01:00
head_64.S
Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts
2017-11-07 10:53:06 +01:00
hpet.c
x86/hpet: Cure interface abuse in the resume path
2017-08-01 13:02:37 +02:00
hw_breakpoint.c
…
i8237.c
…
i8253.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
i8259.c
Merge branch 'linus' into x86/apic, to resolve conflicts
2017-11-07 10:51:10 +01:00
idt.c
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 18:29:23 -08:00
io_delay.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ioport.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq_work.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.c
x86/irq: Simplify hotplug vector accounting
2017-09-25 20:52:02 +02:00
irqinit.c
Merge branch 'linus' into x86/apic, to resolve conflicts
2017-11-07 10:51:10 +01:00
itmt.c
sched/x86: Remove unnecessary TBM3 check to update topology
2017-01-19 08:42:37 +01:00
jump_label.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kdebugfs.c
x86, mpparse, x86/acpi, x86/PCI, x86/dmi, SFI: Use memremap() for RAM mappings
2017-07-18 11:37:58 +02:00
kexec-bzimage64.c
x86/boot/e820: Rename the e820_table_firmware to e820_table_kexec
2017-07-05 10:09:02 +02:00
kgdb.c
…
ksysfs.c
x86/sysfs: Fix off-by-one error in loop termination
2017-09-25 09:36:16 +02:00
kvm.c
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 17:04:36 -08:00
kvmclock.c
X86/KVM: Clear encryption attribute when SEV is active
2017-11-07 15:36:00 +01:00
ldt.c
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 14:13:48 -08:00
livepatch.c
…
machine_kexec_32.c
x86/idt: Consolidate IDT invalidation
2017-08-29 12:07:26 +02:00
machine_kexec_64.c
x86/mm, kexec: Fix memory corruption with SME on successive kexecs
2017-07-30 12:09:12 +02:00
Makefile
x86/umip: Add emulation code for UMIP instructions
2017-11-08 11:16:22 +01:00
mmconf-fam10h_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module.c
x86/module: Detect and skip invalid relocations
2017-11-05 09:52:16 +01:00
mpparse.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
msr.c
x86/msr: Remove bogus cleanup from the error path
2016-12-25 10:47:41 +01:00
nmi_selftest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nmi.c
locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
2017-10-25 11:01:08 +02:00
paravirt_patch_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
paravirt_patch_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
paravirt-spinlocks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
paravirt.c
locking/paravirt: Use new static key for controlling call of virt_spin_lock()
2017-10-10 11:50:12 +02:00
pci-calgary_64.c
x86, calgary: Convert timers to use timer_setup()
2017-11-02 15:50:32 -07:00
pci-dma.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci-iommu_table.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci-nommu.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci-swiotlb.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pcspeaker.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
perf_regs.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
platform-quirks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pmem.c
resource: Provide resource struct in resource walk callback
2017-11-07 15:35:57 +01:00
probe_roms.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
process_32.c
x86/entry/64: Remove all remaining direct thread_struct::sp0 reads
2017-11-02 11:04:47 +01:00
process_64.c
x86/entry/64: Remove thread_struct::sp0
2017-11-02 11:04:48 +01:00
process.c
Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts
2017-11-07 10:53:06 +01:00
ptrace.c
x86/arch_prctl/64: Rename do_arch_prctl() to do_arch_prctl_64()
2017-03-20 16:10:32 +01:00
pvclock.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h>
2017-03-02 08:42:30 +01:00
quirks.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot_fixups_32.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
reboot.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
relocate_kernel_32.S
…
relocate_kernel_64.S
x86/mm, kexec: Fix memory corruption with SME on successive kexecs
2017-07-30 12:09:12 +02:00
resource.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
rtc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
setup_percpu.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
setup.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
signal_compat.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
signal.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
smp.c
x86/tracing: Disentangle pagefault and resched IPI tracing key
2017-08-29 11:42:29 +02:00
smpboot.c
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 18:29:23 -08:00
stacktrace.c
x86/stacktrace: Avoid recording save_stack_trace() wrappers
2017-09-29 19:44:03 +02:00
step.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sys_x86_64.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
sysfb_efi.c
…
sysfb_simplefb.c
x86/sysfb: Fix lfb_size calculation
2016-11-16 09:38:23 +01:00
sysfb.c
…
tboot.c
iommu/vt-d: Correctly disable Intel IOMMU force on
2017-06-15 16:41:10 +02:00
tce_64.c
…
time.c
Merge branch 'linus' into x86/apic, to resolve conflicts
2017-11-07 10:51:10 +01:00
tls.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tls.h
…
topology.c
…
trace_clock.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
tracepoint.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
traps.c
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 18:29:23 -08:00
tsc_msr.c
x86/tsc: Set TSC_KNOWN_FREQ and TSC_RELIABLE flags on Intel Atom SoCs
2016-11-18 10:58:31 +01:00
tsc_sync.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
tsc.c
Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 19:07:38 -08:00
umip.c
x86/umip: Force a page fault when unable to copy emulated result to user
2017-11-08 11:16:22 +01:00
unwind_frame.c
x86/unwind: Disable unwinder warnings on 32-bit
2017-10-10 12:49:49 +02:00
unwind_guess.c
x86/unwind: Add the ORC unwinder
2017-07-26 13:18:20 +02:00
unwind_orc.c
x86/unwind: Disable KASAN checking in the ORC unwinder
2017-11-08 10:21:49 +01:00
uprobes.c
uprobes/x86: Use existing definitions for segment override prefixes
2017-11-01 21:50:08 +01:00
verify_cpu.S
x86/boot: Annotate verify_cpu() as a callable function
2017-09-28 09:39:03 +02:00
vm86_32.c
Merge branch 'linus' into x86/asm, to pick up fixes and resolve conflicts
2017-11-07 10:53:06 +01:00
vmlinux.lds.S
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vsmp_64.c
x86/apic: Remove unused callbacks
2017-09-25 20:51:58 +02:00
x86_init.c
Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-11-13 18:29:23 -08:00