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  1. 17 Apr, 2020 5 commits
    • Jason Yan's avatar
      irqchip/irq-mvebu-icu: Make legacy_bindings static · 9fed9ccb
      Jason Yan authored 
      Fix the following sparse warning:

drivers/irqchip/irq-mvebu-icu.c:69:1: warning: symbol 'legacy_bindings'
was not declared. Should it be static?
Reported-by: default avatarHulk Robot <hulkci@huawei.com>
Signed-off-by: default avatarJason Yan <yanaijie@huawei.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200417074046.46771-1-yanaijie@huawei.com
      9fed9ccb
    • Marc Zyngier's avatar
      irqchip/meson-gpio: Fix HARDIRQ-safe -> HARDIRQ-unsafe lock order · 0a66d6f9
      Marc Zyngier authored 
      Running a lockedp-enabled kernel on a vim3l board (Amlogic SM1)
leads to the following splat:

[   13.557138] WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
[   13.587485] ip/456 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[   13.625922] ffff000059908cf0 (&irq_desc_lock_class){-.-.}-{2:2}, at: __setup_irq+0xf8/0x8d8
[   13.632273] which would create a new lock dependency:
[   13.637272]  (&irq_desc_lock_class){-.-.}-{2:2} -> (&ctl->lock){+.+.}-{2:2}
[   13.644209]
[   13.644209] but this new dependency connects a HARDIRQ-irq-safe lock:
[   13.654122]  (&irq_desc_lock_class){-.-.}-{2:2}
[   13.654125]
[   13.654125] ... which became HARDIRQ-irq-safe at:
[   13.664759]   lock_acquire+0xec/0x368
[   13.666926]   _raw_spin_lock+0x60/0x88
[   13.669979]   handle_fasteoi_irq+0x30/0x178
[   13.674082]   generic_handle_irq+0x38/0x50
[   13.678098]   __handle_domain_irq+0x6c/0xc8
[   13.682209]   gic_handle_irq+0x5c/0xb0
[   13.685872]   el1_irq+0xd0/0x180
[   13.689010]   arch_cpu_idle+0x40/0x220
[   13.692732]   default_idle_call+0x54/0x60
[   13.696677]   do_idle+0x23c/0x2e8
[   13.699903]   cpu_startup_entry+0x30/0x50
[   13.703852]   rest_init+0x1e0/0x2b4
[   13.707301]   arch_call_rest_init+0x18/0x24
[   13.711449]   start_kernel+0x4ec/0x51c
[   13.715167]
[   13.715167] to a HARDIRQ-irq-unsafe lock:
[   13.722426]  (&ctl->lock){+.+.}-{2:2}
[   13.722430]
[   13.722430] ... which became HARDIRQ-irq-unsafe at:
[   13.732319] ...
[   13.732324]   lock_acquire+0xec/0x368
[   13.735985]   _raw_spin_lock+0x60/0x88
[   13.739452]   meson_gpio_irq_domain_alloc+0xcc/0x290
[   13.744392]   irq_domain_alloc_irqs_hierarchy+0x24/0x60
[   13.749586]   __irq_domain_alloc_irqs+0x160/0x2f0
[   13.754254]   irq_create_fwspec_mapping+0x118/0x320
[   13.759073]   irq_create_of_mapping+0x78/0xa0
[   13.763360]   of_irq_get+0x6c/0x80
[   13.766701]   of_mdiobus_register_phy+0x10c/0x238 [of_mdio]
[   13.772227]   of_mdiobus_register+0x158/0x380 [of_mdio]
[   13.777388]   mdio_mux_init+0x180/0x2e8 [mdio_mux]
[   13.782128]   g12a_mdio_mux_probe+0x290/0x398 [mdio_mux_meson_g12a]
[   13.788349]   platform_drv_probe+0x5c/0xb0
[   13.792379]   really_probe+0xe4/0x448
[   13.795979]   driver_probe_device+0xe8/0x140
[   13.800189]   __device_attach_driver+0x94/0x120
[   13.804639]   bus_for_each_drv+0x84/0xd8
[   13.808474]   __device_attach+0xe4/0x168
[   13.812361]   device_initial_probe+0x1c/0x28
[   13.816592]   bus_probe_device+0xa4/0xb0
[   13.820430]   deferred_probe_work_func+0xa8/0x100
[   13.825064]   process_one_work+0x264/0x688
[   13.829088]   worker_thread+0x4c/0x458
[   13.832768]   kthread+0x154/0x158
[   13.836018]   ret_from_fork+0x10/0x18
[   13.839612]
[   13.839612] other info that might help us debug this:
[   13.839612]
[   13.850354]  Possible interrupt unsafe locking scenario:
[   13.850354]
[   13.855720]        CPU0                    CPU1
[   13.858774]        ----                    ----
[   13.863242]   lock(&ctl->lock);
[   13.866330]                                local_irq_disable();
[   13.872233]                                lock(&irq_desc_lock_class);
[   13.878705]                                lock(&ctl->lock);
[   13.884297]   <Interrupt>
[   13.886857]     lock(&irq_desc_lock_class);
[   13.891014]
[   13.891014]  *** DEADLOCK ***

The issue can occur when CPU1 is doing something like irq_set_type()
and CPU0 performing an interrupt allocation, for example. Taking
an interrupt (like the one being reconfigured) would lead to a deadlock.

A solution to this is:

- Reorder the locking so that meson_gpio_irq_update_bits takes the lock
  itself at all times, instead of relying on the caller to lock or not,
  hence making the RMW sequence atomic,

- Rework the critical section in meson_gpio_irq_request_channel to only
  cover the allocation itself, and let the gpio_irq_sel_pin callback
  deal with its own locking if required,

- Take the private spin-lock with interrupts disabled at all times
Reviewed-by: default avatarJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
      0a66d6f9
    • Atish Patra's avatar
      irqchip/sifive-plic: Fix maximum priority threshold value · d727be7b
      Atish Patra authored 
      As per the PLIC specification, maximum priority threshold value is 0x7
not 0xF. Even though it doesn't cause any error in qemu/hifive unleashed,
there may be some implementation which checks the upper bound resulting in
an illegal access.

Fixes: ccbe80ba ("irqchip/sifive-plic: Enable/Disable external interrupts upon cpu online/offline")
Signed-off-by: default avatarAtish Patra <atish.patra@wdc.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200403014609.71831-1-atish.patra@wdc.com
      d727be7b
    • Grygorii Strashko's avatar
      irqchip/ti-sci-inta: Fix processing of masked irqs · 3688b0db
      Grygorii Strashko authored 
      The ti_sci_inta_irq_handler() does not take into account INTA IRQs state
(masked/unmasked) as it uses INTA_STATUS_CLEAR_j register to get INTA IRQs
status, which provides raw status value.
This causes hard IRQ handlers to be called or threaded handlers to be
scheduled many times even if corresponding INTA IRQ is masked.
Above, first of all, affects the LEVEL interrupts processing and causes
unexpected behavior up the system stack or crash.

Fix it by using the Interrupt Masked Status INTA_STATUSM_j register which
provides masked INTA IRQs status.

Fixes: 9f1463b8 ("irqchip/ti-sci-inta: Add support for Interrupt Aggregator driver")
Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Reviewed-by: default avatarLokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20200408191532.31252-1-grygorii.strashko@ti.com
Cc: stable@vger.kernel.org
      3688b0db
    • Zenghui Yu's avatar
      irqchip/mbigen: Free msi_desc on device teardown · edfc23f6
      Zenghui Yu authored 
      Using irq_domain_free_irqs_common() on the irqdomain free path will
leave the MSI descriptor unfreed when platform devices get removed.
Properly free it by MSI domain free function.

Fixes: 9650c60e ("irqchip/mbigen: Create irq domain for each mbigen device")
Signed-off-by: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200408114352.1604-1-yuzenghui@huawei.com
      edfc23f6
  3. 12 Apr, 2020 10 commits
    • Linus Torvalds's avatar
      Linux 5.7-rc1 · 8f3d9f35
      Linus Torvalds authored
      8f3d9f35
    • Linus Torvalds's avatar
      MAINTAINERS: sort field names for all entries · 3b50142d
      Linus Torvalds authored 
      This sorts the actual field names too, potentially causing even more
chaos and confusion at merge time if you have edited the MAINTAINERS
file.  But the end result is a more consistent layout, and hopefully
it's a one-time pain minimized by doing this just before the -rc1
release.

This was entirely scripted:

  ./scripts/parse-maintainers.pl --input=MAINTAINERS --output=MAINTAINERS --order
Requested-by: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3b50142d
    • Linus Torvalds's avatar
      MAINTAINERS: sort entries by entry name · 4400b7d6
      Linus Torvalds authored 
      They are all supposed to be sorted, but people who add new entries don't
always know the alphabet.  Plus sometimes the entry names get edited,
and people don't then re-order the entry.

Let's see how painful this will be for merging purposes (the MAINTAINERS
file is often edited in various different trees), but Joe claims there's
relatively few patches in -next that touch this, and doing it just
before -rc1 is likely the best time.  Fingers crossed.

This was scripted with

  /scripts/parse-maintainers.pl --input=MAINTAINERS --output=MAINTAINERS

but then I also ended up manually upper-casing a few entry names that
stood out when looking at the end result.
Requested-by: default avatarJoe Perches <joe@perches.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4400b7d6
    • Linus Torvalds's avatar
      Merge tag 'x86-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 4f8a3cc1
      Linus Torvalds authored 
      Pull x86 fixes from Thomas Gleixner:
 "A set of three patches to fix the fallout of the newly added split
  lock detection feature.

  It addressed the case where a KVM guest triggers a split lock #AC and
  KVM reinjects it into the guest which is not prepared to handle it.

  Add proper sanity checks which prevent the unconditional injection
  into the guest and handles the #AC on the host side in the same way as
  user space detections are handled. Depending on the detection mode it
  either warns and disables detection for the task or kills the task if
  the mode is set to fatal"

* tag 'x86-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  KVM: VMX: Extend VMXs #AC interceptor to handle split lock #AC in guest
  KVM: x86: Emulate split-lock access as a write in emulator
  x86/split_lock: Provide handle_guest_split_lock()
      4f8a3cc1
    • Linus Torvalds's avatar
      Merge tag 'timers-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 0785249f
      Linus Torvalds authored 
      Pull time(keeping) updates from Thomas Gleixner:

 - Fix the time_for_children symlink in /proc/$PID/ so it properly
   reflects that it part of the 'time' namespace

 - Add the missing userns limit for the allowed number of time
   namespaces, which was half defined but the actual array member was
   not added. This went unnoticed as the array has an exessive empty
   member at the end but introduced a user visible regression as the
   output was corrupted.

 - Prevent further silent ucount corruption by adding a BUILD_BUG_ON()
   to catch half updated data.

* tag 'timers-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ucount: Make sure ucounts in /proc/sys/user don't regress again
  time/namespace: Add max_time_namespaces ucount
  time/namespace: Fix time_for_children symlink
      0785249f
    • Linus Torvalds's avatar
      Merge tag 'sched-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 590680d1
      Linus Torvalds authored 
      Pull scheduler fixes/updates from Thomas Gleixner:

 - Deduplicate the average computations in the scheduler core and the
   fair class code.

 - Fix a raise between runtime distribution and assignement which can
   cause exceeding the quota by up to 70%.

 - Prevent negative results in the imbalanace calculation

 - Remove a stale warning in the workqueue code which can be triggered
   since the call site was moved out of preempt disabled code. It's a
   false positive.

 - Deduplicate the print macros for procfs

 - Add the ucmap values to the SCHED_DEBUG procfs output for completness

* tag 'sched-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/debug: Add task uclamp values to SCHED_DEBUG procfs
  sched/debug: Factor out printing formats into common macros
  sched/debug: Remove redundant macro define
  sched/core: Remove unused rq::last_load_update_tick
  workqueue: Remove the warning in wq_worker_sleeping()
  sched/fair: Fix negative imbalance in imbalance calculation
  sched/fair: Fix race between runtime distribution and assignment
  sched/fair: Align rq->avg_idle and rq->avg_scan_cost
      590680d1
    • Linus Torvalds's avatar
      Merge tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 20e2aa81
      Linus Torvalds authored 
      Pull perf fixes from Thomas Gleixner:
 "Three fixes/updates for perf:

   - Fix the perf event cgroup tracking which tries to track the cgroup
     even for disabled events.

   - Add Ice Lake server support for uncore events

   - Disable pagefaults when retrieving the physical address in the
     sampling code"

* tag 'perf-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Disable page faults when getting phys address
  perf/x86/intel/uncore: Add Ice Lake server uncore support
  perf/cgroup: Correct indirection in perf_less_group_idx()
  perf/core: Fix event cgroup tracking
      20e2aa81
    • Linus Torvalds's avatar
      Merge tag 'locking-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 652fa53c
      Linus Torvalds authored 
      Pull locking fixes from Thomas Gleixner:
 "Three small fixes/updates for the locking core code:

   - Plug a task struct reference leak in the percpu rswem
     implementation.

   - Document the refcount interaction with PID_MAX_LIMIT

   - Improve the 'invalid wait context' data dump in lockdep so it
     contains all information which is required to decode the problem"

* tag 'locking-urgent-2020-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/lockdep: Improve 'invalid wait context' splat
  locking/refcount: Document interaction with PID_MAX_LIMIT
  locking/percpu-rwsem: Fix a task_struct refcount
      652fa53c
    • Linus Torvalds's avatar
      Merge tag '5.7-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6 · 4119bf9f
      Linus Torvalds authored 
      Pull cifs fixes from Steve French:
 "Ten cifs/smb fixes:

   - five RDMA (smbdirect) related fixes

   - add experimental support for swap over SMB3 mounts

   - also a fix which improves performance of signed connections"

* tag '5.7-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
  smb3: enable swap on SMB3 mounts
  smb3: change noisy error message to FYI
  smb3: smbdirect support can be configured by default
  cifs: smbd: Do not schedule work to send immediate packet on every receive
  cifs: smbd: Properly process errors on ib_post_send
  cifs: Allocate crypto structures on the fly for calculating signatures of incoming packets
  cifs: smbd: Update receive credits before sending and deal with credits roll back on failure before sending
  cifs: smbd: Check send queue size before posting a send
  cifs: smbd: Merge code to track pending packets
  cifs: ignore cached share root handle closing errors
      4119bf9f
    • Linus Torvalds's avatar
      Merge tag 'nfs-for-5.7-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs · 50bda5fa
      Linus Torvalds authored 
      Pull NFS client bugfix from Trond Myklebust:
 "Fix an RCU read lock leakage in pnfs_alloc_ds_commits_list()"

* tag 'nfs-for-5.7-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  pNFS: Fix RCU lock leakage
      50bda5fa
  5. 11 Apr, 2020 14 commits
  7. 10 Apr, 2020 11 commits
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