linux-stable.git/Documentation, branch v6.7.2

dt-bindings: gpio: xilinx: Fix node address in gpio

2024-01-25T23:45:28+00:00

[ Upstream commit 314c020c4ed3de72b15603eb6892250bc4b51702 ]

Node address doesn't match reg property which is not correct.

Fixes: ba96b2e7974b ("dt-bindings: gpio: gpio-xilinx: Convert Xilinx axi gpio binding to YAML")
Signed-off-by: Michal Simek 
Reviewed-by: Krzysztof Kozlowski 
Signed-off-by: Bartosz Golaszewski 
Signed-off-by: Sasha Levin

rcu: Restrict access to RCU CPU stall notifiers

2024-01-25T23:45:18+00:00

[ Upstream commit 4e58aaeebb3c27993c734c99eae6881b196b1ddb ]

Although the RCU CPU stall notifiers can be useful for dumping state when
tracking down delicate forward-progress bugs where NUMA effects cause
cache lines to be delivered to a given CPU regularly, but always in a
state that prevents that CPU from making forward progress.  These bugs can
be detected by the RCU CPU stall-warning mechanism, but in some cases,
the stall-warnings printk()s disrupt the forward-progress bug before
any useful state can be obtained.

Unfortunately, the notifier mechanism added by commit 5b404fdabacf ("rcu:
Add RCU CPU stall notifier") can make matters worse if used at all
carelessly. For example, if the stall warning was caused by a lock not
being released, then any attempt to acquire that lock in the notifier
will hang. This will prevent not only the notifier from producing any
useful output, but it will also prevent the stall-warning message from
ever appearing.

This commit therefore hides this new RCU CPU stall notifier
mechanism under a new RCU_CPU_STALL_NOTIFIER Kconfig option that
depends on both DEBUG_KERNEL and RCU_EXPERT.  In addition, the
rcupdate.rcu_cpu_stall_notifiers=1 kernel boot parameter must also
be specified.  The RCU_CPU_STALL_NOTIFIER Kconfig option's help text
contains a warning and explains the dangers of careless use, recommending
lockless notifier code.  In addition, a WARN() is triggered each time
that an attempt is made to register a stall-warning notifier in kernels
built with CONFIG_RCU_CPU_STALL_NOTIFIER=y.

This combination of measures will keep use of this mechanism confined to
debug kernels and away from routine deployments.

[ paulmck: Apply Dan Carpenter feedback. ]

Fixes: 5b404fdabacf ("rcu: Add RCU CPU stall notifier")
Reported-by: Linus Torvalds 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Joel Fernandes (Google) 
Signed-off-by: Neeraj Upadhyay (AMD) 
Signed-off-by: Sasha Levin

PCI/P2PDMA: Remove reference to pci_p2pdma_map_sg()

2024-01-25T23:45:16+00:00

commit 9a000a72af75886e5de13f4edef7f0d788622e7d upstream.

Update Documentation/driver-api/pci/p2pdma.rst doc and remove references to
obsolete p2pdma mapping functions.

Fixes: 0d06132fc84b ("PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg()")
Link: https://lore.kernel.org/r/20231113180325.444692-1-tstruk@gmail.com
Signed-off-by: Tadeusz Struk 
Signed-off-by: Bjorn Helgaas 
Reviewed-by: Logan Gunthorpe 
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman

dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp-phy: fix path to header

2024-01-25T23:45:11+00:00

commit 21a1d02579ae75fd45555b84d20ba55632a14a19 upstream.

Fix the path to bindings header in description.

Fixes: e1c4c5436b4a ("dt-bindings: phy: qcom,qmp-usb3-dp: fix sc8280xp binding")
Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski 
Acked-by: Rob Herring 
Reviewed-by: Johan Hovold 
Link: https://lore.kernel.org/r/20231218130553.45893-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Vinod Koul 
Signed-off-by: Greg Kroah-Hartman

dt-bindings: timer: thead,c900-aclint-mtimer: separate mtime and mtimecmp regs

2024-01-25T23:45:10+00:00

commit b91cf01cf3e63a627b3b65f4284dcf9a4deb80f9 upstream.

The timer registers of aclint don't follow the clint layout and can
be mapped on any different offset. As sg2042 uses separated timer
and mswi for its clint, it should follow the aclint spec and have
separated registers.

The previous patch introduced a new type of T-HEAD aclint timer which
has clint timer layout. Although it has the clint timer layout, it
should follow the aclint spec and uses the separated mtime and mtimecmp
regs. So a ABI change is needed to make the timer fit the aclint spec.

To make T-HEAD aclint timer more closer to the aclint spec, use
regs-names to represent the mtimecmp register, which can avoid hack
for unsupport mtime register of T-HEAD aclint timer.

Also, as T-HEAD aclint only supports mtimecmp, it is unnecessary to
implement the whole aclint spec. To make this binding T-HEAD specific,
only add reg-name for existed register. For details, see the discussion
in the last link.

Signed-off-by: Inochi Amaoto
Fixes: 4734449f7311 ("dt-bindings: timer: Add Sophgo sg2042 CLINT timer")
Link: https://lists.infradead.org/pipermail/opensbi/2023-October/005693.html
Link: https://github.com/riscv/riscv-aclint/blob/main/riscv-aclint.adoc
Link: https://lore.kernel.org/all/IA1PR20MB4953F9D77FFC76A9D236922DBBB6A@IA1PR20MB4953.namprd20.prod.outlook.com/
Acked-by: Guo Ren
Acked-by: Conor Dooley
Signed-off-by: Daniel Lezcano
Link: https://lore.kernel.org/r/IA1PR20MB49531ED1BCC00D6B265C2D10BB86A@IA1PR20MB4953.namprd20.prod.outlook.com
Signed-off-by: Greg Kroah-Hartman

media: dt-bindings: media: rkisp1: Fix the port description for the parallel interface

2024-01-25T23:45:03+00:00

[ Upstream commit 25bf28b25a2afa1864b7143259443160d9163ea0 ]

The bus-type belongs to the endpoint's properties and should therefore
be moved.

Link: https://lore.kernel.org/r/20231115164407.99876-1-mehdi.djait@bootlin.com

Fixes: 6a0eaa25bf36 ("media: dt-bindings: media: rkisp1: Add port for parallel interface")
Signed-off-by: Mehdi Djait 
Acked-by: Conor Dooley 
Signed-off-by: Laurent Pinchart 
Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Sasha Levin

dt-bindings: media: mediatek: mdp3: correct RDMA and WROT node with generic names

2024-01-25T23:44:50+00:00

[ Upstream commit f5f185bf7c42f6ca885202fefc40fc871d08a722 ]

The DMA-related nodes RDMA/WROT in MDP3 should be changed to generic names.
In addition, fix improper space indent in example.

Fixes: 4ad7b39623ab ("media: dt-binding: mediatek: add bindings for MediaTek MDP3 components")
Signed-off-by: Moudy Ho 
Acked-by: Rob Herring 
Reviewed-by: AngeloGioacchino Del Regno 
Signed-off-by: AngeloGioacchino Del Regno 
Signed-off-by: Sasha Levin

dt-bindings: arm: qcom: Fix html link

2024-01-25T23:44:47+00:00

[ Upstream commit 3c3fcac8d3b1b0f242845c3b3c3263bd38b3b92f ]

This link got broken by commit e790a4ce5290 ("arm: docs: Move Arm
documentation to Documentation/arch/") when the doc moved from arm/ to
arch/arm/. Fix the link so that it can continue to be followed.

Fixes: e790a4ce5290 ("arm: docs: Move Arm documentation to Documentation/arch/")
Cc: Alexandre TORGUE 
Cc: Yanteng Si 
Cc: Jonathan Corbet 
Reviewed-by: Douglas Anderson 
Acked-by: Krzysztof Kozlowski 
Signed-off-by: Stephen Boyd 
Link: https://lore.kernel.org/r/20231129030443.2753833-1-swboyd@chromium.org
Signed-off-by: Bjorn Andersson 
Signed-off-by: Sasha Levin

docs: kernel_feat.py: fix potential command injection

2024-01-20T10:53:02+00:00

commit c48a7c44a1d02516309015b6134c9bb982e17008 upstream.

The kernel-feat directive passes its argument straight to the shell.
This is unfortunate and unnecessary.

Let's always use paths relative to $srctree/Documentation/ and use
subprocess.check_call() instead of subprocess.Popen(shell=True).

This also makes the code shorter.

This is analogous to commit 3231dd586277 ("docs: kernel_abi.py: fix
command injection") where we did exactly the same thing for
kernel_abi.py, somehow I completely missed this one.

Link: https://fosstodon.org/@jani/111676532203641247
Reported-by: Jani Nikula 
Signed-off-by: Vegard Nossum 
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Corbet 
Link: https://lore.kernel.org/r/20240110174758.3680506-1-vegard.nossum@oracle.com
Signed-off-by: Greg Kroah-Hartman

Merge tag 'i2c-for-6.7-final' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2024-01-06T19:35:37+00:00

Pull i2c fixes from Wolfram Sang:
 "Improve the detection when to run atomic transfer handlers for kernels
  with preemption disabled. This removes some false positive splats a
  number of users were seeing if their driver didn't have support for
  atomic transfers.

  Also, fix a typo in the docs while we are here"

* tag 'i2c-for-6.7-final' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: core: Fix atomic xfer check for non-preempt config
  Documentation/i2c: fix spelling error in i2c-address-translators