user/sven/linux.git/drivers/acpi/processor_driver.c, branch v4.9.203

ACPI/processor: Replace racy task affinity logic

2018-03-24T10:00:09Z

[ Upstream commit 8153f9ac43897f9f4786b30badc134fcc1a4fb11 ] acpi_processor_get_throttling() requires to invoke the getter function on the target CPU. This is achieved by temporarily setting the affinity of the calling user space thread to the requested CPU and reset it to the original affinity afterwards. That's racy vs. CPU hotplug and concurrent affinity settings for that thread resulting in code executing on the wrong CPU and overwriting the new affinity setting. acpi_processor_get_throttling() is invoked in two ways: 1) The CPU online callback, which is already running on the target CPU and obviously protected against hotplug and not affected by affinity settings. 2) The ACPI driver probe function, which is not protected against hotplug during modprobe. Switch it over to work_on_cpu() and protect the probe function against CPU hotplug. Signed-off-by: Thomas Gleixner Cc: Fenghua Yu Cc: Tony Luck Cc: Herbert Xu Cc: "Rafael J. Wysocki" Cc: Peter Zijlstra Cc: Benjamin Herrenschmidt Cc: Sebastian Siewior Cc: Lai Jiangshan Cc: linux-acpi@vger.kernel.org Cc: Viresh Kumar Cc: Michael Ellerman Cc: Tejun Heo Cc: "David S. Miller" Cc: Len Brown Link: http://lkml.kernel.org/r/20170412201042.785920903@linutronix.de Signed-off-by: Thomas Gleixner Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

ACPI/processor: Fix error handling in __acpi_processor_start()

2018-03-24T10:00:09Z

[ Upstream commit a5cbdf693a60d5b86d4d21dfedd90f17754eb273 ] When acpi_install_notify_handler() fails the cooling device stays registered and the sysfs files created via acpi_pss_perf_init() are leaked and the function returns success. Undo acpi_pss_perf_init() and return a proper error code. Signed-off-by: Thomas Gleixner Cc: Fenghua Yu Cc: Tony Luck Cc: Herbert Xu Cc: "Rafael J. Wysocki" Cc: Peter Zijlstra Cc: Benjamin Herrenschmidt Cc: Sebastian Siewior Cc: Lai Jiangshan Cc: linux-acpi@vger.kernel.org Cc: Viresh Kumar Cc: Michael Ellerman Cc: Tejun Heo Cc: "David S. Miller" Cc: Len Brown Link: http://lkml.kernel.org/r/20170412201042.695499645@linutronix.de Signed-off-by: Thomas Gleixner Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

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

2016-10-04T02:43:08Z

Pull CPU hotplug updates from Thomas Gleixner: "Yet another batch of cpu hotplug core updates and conversions: - Provide core infrastructure for multi instance drivers so the drivers do not have to keep custom lists. - Convert custom lists to the new infrastructure. The block-mq custom list conversion comes through the block tree and makes the diffstat tip over to more lines removed than added. - Handle unbalanced hotplug enable/disable calls more gracefully. - Remove the obsolete CPU_STARTING/DYING notifier support. - Convert another batch of notifier users. The relayfs changes which conflicted with the conversion have been shipped to me by Andrew. The remaining lot is targeted for 4.10 so that we finally can remove the rest of the notifiers" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits) cpufreq: Fix up conversion to hotplug state machine blk/mq: Reserve hotplug states for block multiqueue x86/apic/uv: Convert to hotplug state machine s390/mm/pfault: Convert to hotplug state machine mips/loongson/smp: Convert to hotplug state machine mips/octeon/smp: Convert to hotplug state machine fault-injection/cpu: Convert to hotplug state machine padata: Convert to hotplug state machine cpufreq: Convert to hotplug state machine ACPI/processor: Convert to hotplug state machine virtio scsi: Convert to hotplug state machine oprofile/timer: Convert to hotplug state machine block/softirq: Convert to hotplug state machine lib/irq_poll: Convert to hotplug state machine x86/microcode: Convert to hotplug state machine sh/SH-X3 SMP: Convert to hotplug state machine ia64/mca: Convert to hotplug state machine ARM/OMAP/wakeupgen: Convert to hotplug state machine ARM/shmobile: Convert to hotplug state machine arm64/FP/SIMD: Convert to hotplug state machine ...

ACPI/processor: Convert to hotplug state machine

2016-09-19T19:44:29Z

Install the callbacks via the state machine. Signed-off-by: Sebastian Andrzej Siewior Acked-by: "Rafael J. Wysocki" Cc: Peter Zijlstra Cc: linux-acpi@vger.kernel.org Cc: rt@linutronix.de Cc: Len Brown Link: http://lkml.kernel.org/r/20160906170457.32393-12-bigeasy@linutronix.de Signed-off-by: Thomas Gleixner

ACPI / CPPC: Don't return on CPPC probe failure

2016-09-08T21:02:14Z

It is still possible to continue even CPPC data is invalid or missing. Suggested-by: Alexey Klimov Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki

ACPI / CPPC: Allow build with ACPI_CPU_FREQ_PSS config

2016-09-08T21:02:14Z

Some newer x86 platforms have support for both _CPC and _PSS object. So kernel config can have both ACPI_CPU_FREQ_PSS and ACPI_CPPC_LIB. So remove restriction for ACPI_CPPC_LIB to build only when ACPI_CPU_FREQ_PSS is not defined. Also for legacy systems with only _PSS, we shouldn't bail out if acpi_cppc_processor_probe() fails, if ACPI_CPU_FREQ_PSS is also defined. Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki

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

2016-07-29T20:55:30Z

Pull smp hotplug updates from Thomas Gleixner: "This is the next part of the hotplug rework. - Convert all notifiers with a priority assigned - Convert all CPU_STARTING/DYING notifiers The final removal of the STARTING/DYING infrastructure will happen when the merge window closes. Another 700 hundred line of unpenetrable maze gone :)" * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits) timers/core: Correct callback order during CPU hot plug leds/trigger/cpu: Move from CPU_STARTING to ONLINE level powerpc/numa: Convert to hotplug state machine arm/perf: Fix hotplug state machine conversion irqchip/armada: Avoid unused function warnings ARC/time: Convert to hotplug state machine clocksource/atlas7: Convert to hotplug state machine clocksource/armada-370-xp: Convert to hotplug state machine clocksource/exynos_mct: Convert to hotplug state machine clocksource/arm_global_timer: Convert to hotplug state machine rcu: Convert rcutree to hotplug state machine KVM/arm/arm64/vgic-new: Convert to hotplug state machine smp/cfd: Convert core to hotplug state machine x86/x2apic: Convert to CPU hotplug state machine profile: Convert to hotplug state machine timers/core: Convert to hotplug state machine hrtimer: Convert to hotplug state machine x86/tboot: Convert to hotplug state machine arm64/armv8 deprecated: Convert to hotplug state machine hwtracing/coresight-etm4x: Convert to hotplug state machine ...

ACPI / processor_idle: Add support for Low Power Idle(LPI) states

2016-07-21T21:25:58Z

ACPI 6.0 introduced an optional object _LPI that provides an alternate method to describe Low Power Idle states. It defines the local power states for each node in a hierarchical processor topology. The OSPM can use _LPI object to select a local power state for each level of processor hierarchy in the system. They used to produce a composite power state request that is presented to the platform by the OSPM. Since multiple processors affect the idle state for any non-leaf hierarchy node, coordination of idle state requests between the processors is required. ACPI supports two different coordination schemes: Platform coordinated and OS initiated. This patch adds initial support for Platform coordination scheme of LPI. Signed-off-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki

ACPI/processor: Avoid STARTING/DYING actions in a more logical way

2016-07-15T08:40:24Z

As part of the hotplug cleanup, the CPU_STARTING/DYING actions are going away soon. This driver needlessly uses those two macro, and so this patch replaces that code with something more sensible. Commit: 8da8373447d6a57a5a9f55233d35beb15d92d0d2 ("ACPI / processor: Fix STARTING/DYING action in acpi_cpu_soft_notify()") added checks for those two actions, because the notification callback can sleep, causing a hung CPU. This patch instead checks for the ONLINE/DEAD actions, which are the ones that are handled by the driver in the first place. Signed-off-by: Richard Cochran Signed-off-by: Anna-Maria Gleixner Reviewed-by: Sebastian Andrzej Siewior Cc: Len Brown Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Thomas Gleixner Cc: linux-acpi@vger.kernel.org Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160713153335.964962885@linutronix.de Signed-off-by: Ingo Molnar

ACPI / sleep: move acpi_processor_sleep to sleep.c

2016-02-21T23:53:56Z

acpi_processor_sleep is neither related nor used by CPUIdle framework. It's used in system suspend/resume path as a syscore operation. It makes more sense to move it to acpi/sleep.c where all the S-state transition (a.k.a. Linux system suspend/hiberate) related code are present. Also make it depend on CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT so that it's not compiled on architecture like ARM64 where S-states are not yet defined in ACPI. Signed-off-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki