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Ingo Molnar
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Merge tag 'v4.20-rc5' into irq/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2 parents e8da879 + 2595646 commit 989a422

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‎.mailmap

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@@ -159,6 +159,7 @@ Peter Oruba <peter@oruba.de>
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Peter Oruba <peter.oruba@amd.com>
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Pratyush Anand <pratyush.anand@gmail.com> <pratyush.anand@st.com>
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Praveen BP <praveenbp@ti.com>
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Punit Agrawal <punitagrawal@gmail.com> <punit.agrawal@arm.com>
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Qais Yousef <qsyousef@gmail.com> <qais.yousef@imgtec.com>
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Oleksij Rempel <linux@rempel-privat.de> <bug-track@fisher-privat.net>
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Oleksij Rempel <linux@rempel-privat.de> <external.Oleksij.Rempel@de.bosch.com>

‎CREDITS

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@@ -2138,6 +2138,10 @@ E: paul@laufernet.com
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D: Soundblaster driver fixes, ISAPnP quirk
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S: California, USA
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N: Jarkko Lavinen
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E: jarkko.lavinen@nokia.com
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D: OMAP MMC support
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N: Jonathan Layes
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D: ARPD support
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@@ -2200,6 +2204,10 @@ S: Post Office Box 371
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S: North Little Rock, Arkansas 72115
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S: USA
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N: Christopher Li
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E: sparse@chrisli.org
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D: Sparse maintainer 2009 - 2018
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N: Stephan Linz
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E: linz@mazet.de
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E: Stephan.Linz@gmx.de

‎Documentation/ABI/testing/sysfs-class-led-trigger-pattern

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@@ -37,8 +37,8 @@ Description:
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0-| / \/ \/
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+---0----1----2----3----4----5----6------------> time (s)
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2. To make the LED go instantly from one brigntess value to another,
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we should use use zero-time lengths (the brightness must be same as
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2. To make the LED go instantly from one brightness value to another,
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we should use zero-time lengths (the brightness must be same as
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the previous tuple's). So the format should be:
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"brightness_1 duration_1 brightness_1 0 brightness_2 duration_2
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brightness_2 0 ...". For example:

‎Documentation/admin-guide/kernel-parameters.txt

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causing system reset or hang due to sending
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INIT from AP to BSP.
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disable_counter_freezing [HW]
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perf_v4_pmi= [X86,INTEL]
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Format: <bool>
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Disable Intel PMU counter freezing feature.
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The feature only exists starting from
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Arch Perfmon v4 (Skylake and newer).
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before loading.
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See Documentation/blockdev/ramdisk.txt.
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psi= [KNL] Enable or disable pressure stall information
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tracking.
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Format: <bool>
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psmouse.proto= [HW,MOUSE] Highest PS2 mouse protocol extension to
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probe for; one of (bare|imps|exps|lifebook|any).
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psmouse.rate= [HW,MOUSE] Set desired mouse report rate, in reports
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spectre_v2= [X86] Control mitigation of Spectre variant 2
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(indirect branch speculation) vulnerability.
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The default operation protects the kernel from
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user space attacks.
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on - unconditionally enable
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off - unconditionally disable
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on - unconditionally enable, implies
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spectre_v2_user=on
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off - unconditionally disable, implies
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spectre_v2_user=off
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auto - kernel detects whether your CPU model is
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vulnerable
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CONFIG_RETPOLINE configuration option, and the
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compiler with which the kernel was built.
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Selecting 'on' will also enable the mitigation
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against user space to user space task attacks.
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Selecting 'off' will disable both the kernel and
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the user space protections.
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Specific mitigations can also be selected manually:
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retpoline - replace indirect branches
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Not specifying this option is equivalent to
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spectre_v2=auto.
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spectre_v2_user=
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[X86] Control mitigation of Spectre variant 2
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(indirect branch speculation) vulnerability between
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user space tasks
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on - Unconditionally enable mitigations. Is
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enforced by spectre_v2=on
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off - Unconditionally disable mitigations. Is
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enforced by spectre_v2=off
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prctl - Indirect branch speculation is enabled,
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but mitigation can be enabled via prctl
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per thread. The mitigation control state
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is inherited on fork.
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prctl,ibpb
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- Like "prctl" above, but only STIBP is
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controlled per thread. IBPB is issued
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always when switching between different user
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space processes.
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seccomp
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- Same as "prctl" above, but all seccomp
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threads will enable the mitigation unless
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they explicitly opt out.
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seccomp,ibpb
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- Like "seccomp" above, but only STIBP is
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controlled per thread. IBPB is issued
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always when switching between different
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user space processes.
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auto - Kernel selects the mitigation depending on
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the available CPU features and vulnerability.
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Default mitigation:
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If CONFIG_SECCOMP=y then "seccomp", otherwise "prctl"
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Not specifying this option is equivalent to
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spectre_v2_user=auto.
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spec_store_bypass_disable=
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[HW] Control Speculative Store Bypass (SSB) Disable mitigation
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(Speculative Store Bypass vulnerability)
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prevent spurious wakeup);
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n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a
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pause after every control message);
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o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra
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delay after resetting its port);
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Example: quirks=0781:5580:bk,0a5c:5834:gij
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usbhid.mousepoll=

‎Documentation/admin-guide/pm/cpufreq.rst

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a governor ``sysfs`` interface to it. Next, the governor is started by
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invoking its ``->start()`` callback.
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That callback it expected to register per-CPU utilization update callbacks for
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That callback is expected to register per-CPU utilization update callbacks for
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all of the online CPUs belonging to the given policy with the CPU scheduler.
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The utilization update callbacks will be invoked by the CPU scheduler on
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important events, like task enqueue and dequeue, on every iteration of the

‎Documentation/admin-guide/security-bugs.rst

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@@ -32,16 +32,17 @@ Disclosure and embargoed information
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The security list is not a disclosure channel. For that, see Coordination
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below.
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Once a robust fix has been developed, our preference is to release the
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fix in a timely fashion, treating it no differently than any of the other
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thousands of changes and fixes the Linux kernel project releases every
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month.
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However, at the request of the reporter, we will postpone releasing the
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fix for up to 5 business days after the date of the report or after the
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embargo has lifted; whichever comes first. The only exception to that
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rule is if the bug is publicly known, in which case the preference is to
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release the fix as soon as it's available.
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Once a robust fix has been developed, the release process starts. Fixes
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for publicly known bugs are released immediately.
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Although our preference is to release fixes for publicly undisclosed bugs
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as soon as they become available, this may be postponed at the request of
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the reporter or an affected party for up to 7 calendar days from the start
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of the release process, with an exceptional extension to 14 calendar days
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if it is agreed that the criticality of the bug requires more time. The
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only valid reason for deferring the publication of a fix is to accommodate
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the logistics of QA and large scale rollouts which require release
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coordination.
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Whilst embargoed information may be shared with trusted individuals in
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‎Documentation/arm64/silicon-errata.txt

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| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 |
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| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 |
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| ARM | Cortex-A76 | #1188873 | ARM64_ERRATUM_1188873 |
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| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 |
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| ARM | MMU-500 | #841119,#826419 | N/A |
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| | | | |
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| Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 |

‎Documentation/core-api/xarray.rst

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@@ -74,7 +74,8 @@ using :c:func:`xa_load`. xa_store will overwrite any entry with the
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new entry and return the previous entry stored at that index. You can
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use :c:func:`xa_erase` instead of calling :c:func:`xa_store` with a
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``NULL`` entry. There is no difference between an entry that has never
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been stored to and one that has most recently had ``NULL`` stored to it.
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been stored to, one that has been erased and one that has most recently
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had ``NULL`` stored to it.
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You can conditionally replace an entry at an index by using
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:c:func:`xa_cmpxchg`. Like :c:func:`cmpxchg`, it will only succeed if
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indices. Storing into one index may result in the entry retrieved by
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some, but not all of the other indices changing.
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Sometimes you need to ensure that a subsequent call to :c:func:`xa_store`
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will not need to allocate memory. The :c:func:`xa_reserve` function
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will store a reserved entry at the indicated index. Users of the normal
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API will see this entry as containing ``NULL``. If you do not need to
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use the reserved entry, you can call :c:func:`xa_release` to remove the
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unused entry. If another user has stored to the entry in the meantime,
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:c:func:`xa_release` will do nothing; if instead you want the entry to
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become ``NULL``, you should use :c:func:`xa_erase`.
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If all entries in the array are ``NULL``, the :c:func:`xa_empty` function
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will return ``true``.
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Finally, you can remove all entries from an XArray by calling
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:c:func:`xa_destroy`. If the XArray entries are pointers, you may wish
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to free the entries first. You can do this by iterating over all present
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entries in the XArray using the :c:func:`xa_for_each` iterator.
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ID assignment
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-------------
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Allocating XArrays
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------------------
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If you use :c:func:`DEFINE_XARRAY_ALLOC` to define the XArray, or
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initialise it by passing ``XA_FLAGS_ALLOC`` to :c:func:`xa_init_flags`,
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the XArray changes to track whether entries are in use or not.
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You can call :c:func:`xa_alloc` to store the entry at any unused index
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in the XArray. If you need to modify the array from interrupt context,
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you can use :c:func:`xa_alloc_bh` or :c:func:`xa_alloc_irq` to disable
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interrupts while allocating the ID. Unlike :c:func:`xa_store`, allocating
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a ``NULL`` pointer does not delete an entry. Instead it reserves an
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entry like :c:func:`xa_reserve` and you can release it using either
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:c:func:`xa_erase` or :c:func:`xa_release`. To use ID assignment, the
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XArray must be defined with :c:func:`DEFINE_XARRAY_ALLOC`, or initialised
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by passing ``XA_FLAGS_ALLOC`` to :c:func:`xa_init_flags`,
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interrupts while allocating the ID.
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Using :c:func:`xa_store`, :c:func:`xa_cmpxchg` or :c:func:`xa_insert`
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will mark the entry as being allocated. Unlike a normal XArray, storing
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``NULL`` will mark the entry as being in use, like :c:func:`xa_reserve`.
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To free an entry, use :c:func:`xa_erase` (or :c:func:`xa_release` if
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you only want to free the entry if it's ``NULL``).
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You cannot use ``XA_MARK_0`` with an allocating XArray as this mark
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is used to track whether an entry is free or not. The other marks are
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available for your use.
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Memory allocation
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-----------------
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Takes xa_lock internally:
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* :c:func:`xa_store`
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* :c:func:`xa_store_bh`
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* :c:func:`xa_store_irq`
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* :c:func:`xa_insert`
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* :c:func:`xa_erase`
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* :c:func:`xa_erase_bh`
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* :c:func:`xa_alloc`
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* :c:func:`xa_alloc_bh`
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* :c:func:`xa_alloc_irq`
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* :c:func:`xa_reserve`
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* :c:func:`xa_reserve_bh`
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* :c:func:`xa_reserve_irq`
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* :c:func:`xa_destroy`
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* :c:func:`xa_set_mark`
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* :c:func:`xa_clear_mark`
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* :c:func:`__xa_erase`
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* :c:func:`__xa_cmpxchg`
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* :c:func:`__xa_alloc`
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* :c:func:`__xa_reserve`
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* :c:func:`__xa_set_mark`
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* :c:func:`__xa_clear_mark`
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using :c:func:`xa_lock_irqsave` in both the interrupt handler and process
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context, or :c:func:`xa_lock_irq` in process context and :c:func:`xa_lock`
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in the interrupt handler. Some of the more common patterns have helper
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functions such as :c:func:`xa_erase_bh` and :c:func:`xa_erase_irq`.
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functions such as :c:func:`xa_store_bh`, :c:func:`xa_store_irq`,
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:c:func:`xa_erase_bh` and :c:func:`xa_erase_irq`.
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Sometimes you need to protect access to the XArray with a mutex because
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that lock sits above another mutex in the locking hierarchy. That does
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- :c:func:`xa_is_zero`
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- Zero entries appear as ``NULL`` through the Normal API, but occupy
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an entry in the XArray which can be used to reserve the index for
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future use.
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future use. This is used by allocating XArrays for allocated entries
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which are ``NULL``.
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Other internal entries may be added in the future. As far as possible, they
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will be handled by :c:func:`xas_retry`.

‎Documentation/cpu-freq/cpufreq-stats.txt

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This will give a fine grained information about all the CPU frequency
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transitions. The cat output here is a two dimensional matrix, where an entry
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<i,j> (row i, column j) represents the count of number of transitions from
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Freq_i to Freq_j. Freq_i is in descending order with increasing rows and
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Freq_j is in descending order with increasing columns. The output here also
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contains the actual freq values for each row and column for better readability.
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Freq_i to Freq_j. Freq_i rows and Freq_j columns follow the sorting order in
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which the driver has provided the frequency table initially to the cpufreq core
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and so can be sorted (ascending or descending) or unsorted. The output here
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also contains the actual freq values for each row and column for better
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readability.
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If the transition table is bigger than PAGE_SIZE, reading this will
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return an -EFBIG error.

‎Documentation/devicetree/bindings/arm/shmobile.txt

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compatible = "renesas,r8a77470"
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- RZ/G2M (R8A774A1)
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compatible = "renesas,r8a774a1"
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- RZ/G2E (RA8774C0)
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- RZ/G2E (R8A774C0)
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compatible = "renesas,r8a774c0"
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- R-Car M1A (R8A77781)
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compatible = "renesas,r8a7778"

‎Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt

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