linux-stable/drivers/sh
Linus Torvalds 91552ab8ff The usual updates from the irq departement:
Core changes:
 
  - Provide IRQF_NO_AUTOEN as a flag for request*_irq() so drivers can be
    cleaned up which either use a seperate mechanism to prevent auto-enable
    at request time or have a racy mechanism which disables the interrupt
    right after request.
 
  - Get rid of the last usage of irq_create_identity_mapping() and remove
    the interface.
 
  - An overhaul of tasklet_disable(). Most usage sites of tasklet_disable()
    are in task context and usually in cleanup, teardown code pathes.
    tasklet_disable() spinwaits for a tasklet which is currently executed.
    That's not only a problem for PREEMPT_RT where this can lead to a live
    lock when the disabling task preempts the softirq thread. It's also
    problematic in context of virtualization when the vCPU which runs the
    tasklet is scheduled out and the disabling code has to spin wait until
    it's scheduled back in. Though there are a few code pathes which invoke
    tasklet_disable() from non-sleepable context. For these a new disable
    variant which still spinwaits is provided which allows to switch
    tasklet_disable() to a sleep wait mechanism. For the atomic use cases
    this does not solve the live lock issue on PREEMPT_RT. That is mitigated
    by blocking on the RT specific softirq lock.
 
  - The PREEMPT_RT specific implementation of softirq processing and
    local_bh_disable/enable().
 
    On RT enabled kernels soft interrupt processing happens always in task
    context and all interrupt handlers, which are not explicitly marked to
    be invoked in hard interrupt context are forced into task context as
    well. This allows to protect against softirq processing with a per
    CPU lock, which in turn allows to make BH disabled regions preemptible.
 
    Most of the softirq handling code is still shared. The RT/non-RT
    specific differences are addressed with a set of inline functions which
    provide the context specific functionality. The local_bh_disable() /
    local_bh_enable() mechanism are obviously seperate.
 
  - The usual set of small improvements and cleanups
 
 Driver changes:
 
  - New drivers for Nuvoton WPCM450 and DT 79rc3243x interrupt controllers
 
  - Extended functionality for MStar, STM32 and SC7280 irq chips
 
  - Enhanced robustness for ARM GICv3/4.1 drivers
 
  - The usual set of cleanups and improvements all over the place
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Merge tag 'irq-core-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq updates from Thomas Gleixner:
 "The usual updates from the irq departement:

  Core changes:

   - Provide IRQF_NO_AUTOEN as a flag for request*_irq() so drivers can
     be cleaned up which either use a seperate mechanism to prevent
     auto-enable at request time or have a racy mechanism which disables
     the interrupt right after request.

   - Get rid of the last usage of irq_create_identity_mapping() and
     remove the interface.

   - An overhaul of tasklet_disable().

     Most usage sites of tasklet_disable() are in task context and
     usually in cleanup, teardown code pathes. tasklet_disable()
     spinwaits for a tasklet which is currently executed. That's not
     only a problem for PREEMPT_RT where this can lead to a live lock
     when the disabling task preempts the softirq thread. It's also
     problematic in context of virtualization when the vCPU which runs
     the tasklet is scheduled out and the disabling code has to spin
     wait until it's scheduled back in.

     There are a few code pathes which invoke tasklet_disable() from
     non-sleepable context. For these a new disable variant which still
     spinwaits is provided which allows to switch tasklet_disable() to a
     sleep wait mechanism. For the atomic use cases this does not solve
     the live lock issue on PREEMPT_RT. That is mitigated by blocking on
     the RT specific softirq lock.

   - The PREEMPT_RT specific implementation of softirq processing and
     local_bh_disable/enable().

     On RT enabled kernels soft interrupt processing happens always in
     task context and all interrupt handlers, which are not explicitly
     marked to be invoked in hard interrupt context are forced into task
     context as well. This allows to protect against softirq processing
     with a per CPU lock, which in turn allows to make BH disabled
     regions preemptible.

     Most of the softirq handling code is still shared. The RT/non-RT
     specific differences are addressed with a set of inline functions
     which provide the context specific functionality. The
     local_bh_disable() / local_bh_enable() mechanism are obviously
     seperate.

   - The usual set of small improvements and cleanups

  Driver changes:

   - New drivers for Nuvoton WPCM450 and DT 79rc3243x interrupt
     controllers

   - Extended functionality for MStar, STM32 and SC7280 irq chips

   - Enhanced robustness for ARM GICv3/4.1 drivers

   - The usual set of cleanups and improvements all over the place"

* tag 'irq-core-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (53 commits)
  irqchip/xilinx: Expose Kconfig option for Zynq/ZynqMP
  irqchip/gic-v3: Do not enable irqs when handling spurious interrups
  dt-bindings: interrupt-controller: Add IDT 79RC3243x Interrupt Controller
  irqchip: Add support for IDT 79rc3243x interrupt controller
  irqdomain: Drop references to recusive irqdomain setup
  irqdomain: Get rid of irq_create_strict_mappings()
  irqchip/jcore-aic: Kill use of irq_create_strict_mappings()
  ARM: PXA: Kill use of irq_create_strict_mappings()
  irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection
  irqchip/tb10x: Use 'fallthrough' to eliminate a warning
  genirq: Reduce irqdebug cacheline bouncing
  kernel: Initialize cpumask before parsing
  irqchip/wpcm450: Drop COMPILE_TEST
  irqchip/irq-mst: Support polarity configuration
  irqchip: Add driver for WPCM450 interrupt controller
  dt-bindings: interrupt-controller: Add nuvoton, wpcm450-aic
  dt-bindings: qcom,pdc: Add compatible for sc7280
  irqchip/stm32: Add usart instances exti direct event support
  irqchip/gic-v3: Fix OF_BAD_ADDR error handling
  irqchip/sifive-plic: Mark two global variables __ro_after_init
  ...
2021-04-26 09:43:16 -07:00
..
clk iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
intc sh: intc: Drop the use of irq_create_identity_mapping() 2021-04-07 12:12:52 +01:00
maple module: remove never implemented MODULE_SUPPORTED_DEVICE 2021-03-17 13:16:18 -07:00
superhyway treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pm_runtime.c drivers: sh: Stop using the legacy clock domain on ARM 2016-05-30 09:41:11 +09:00