From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- Documentation/devicetree/bindings/arc/axs101.txt | 7 +++++ Documentation/devicetree/bindings/arc/axs103.txt | 8 ++++++ Documentation/devicetree/bindings/arc/eznps.txt | 7 +++++ Documentation/devicetree/bindings/arc/hsdk.txt | 7 +++++ Documentation/devicetree/bindings/arc/pct.txt | 20 +++++++++++++ .../devicetree/bindings/arc/snps,archs-pct.yaml | 33 ++++++++++++++++++++++ 6 files changed, 82 insertions(+) create mode 100644 Documentation/devicetree/bindings/arc/axs101.txt create mode 100644 Documentation/devicetree/bindings/arc/axs103.txt create mode 100644 Documentation/devicetree/bindings/arc/eznps.txt create mode 100644 Documentation/devicetree/bindings/arc/hsdk.txt create mode 100644 Documentation/devicetree/bindings/arc/pct.txt create mode 100644 Documentation/devicetree/bindings/arc/snps,archs-pct.yaml (limited to 'Documentation/devicetree/bindings/arc') diff --git a/Documentation/devicetree/bindings/arc/axs101.txt b/Documentation/devicetree/bindings/arc/axs101.txt new file mode 100644 index 000000000..48290d517 --- /dev/null +++ b/Documentation/devicetree/bindings/arc/axs101.txt @@ -0,0 +1,7 @@ +Synopsys DesignWare ARC Software Development Platforms Device Tree Bindings +--------------------------------------------------------------------------- + +SDP Main Board with an AXC001 CPU Card hoisting ARC700 core in silicon + +Required root node properties: + - compatible = "snps,axs101", "snps,arc-sdp"; diff --git a/Documentation/devicetree/bindings/arc/axs103.txt b/Documentation/devicetree/bindings/arc/axs103.txt new file mode 100644 index 000000000..6eea862e7 --- /dev/null +++ b/Documentation/devicetree/bindings/arc/axs103.txt @@ -0,0 +1,8 @@ +Synopsys DesignWare ARC Software Development Platforms Device Tree Bindings +--------------------------------------------------------------------------- + +SDP Main Board with an AXC003 FPGA Card which can contain various flavours of +HS38x cores. + +Required root node properties: + - compatible = "snps,axs103", "snps,arc-sdp"; diff --git a/Documentation/devicetree/bindings/arc/eznps.txt b/Documentation/devicetree/bindings/arc/eznps.txt new file mode 100644 index 000000000..1aa50c640 --- /dev/null +++ b/Documentation/devicetree/bindings/arc/eznps.txt @@ -0,0 +1,7 @@ +EZchip NPS Network Processor Platforms Device Tree Bindings +--------------------------------------------------------------------------- + +Appliance main board with NPS400 ASIC. + +Required root node properties: + - compatible = "ezchip,arc-nps"; diff --git a/Documentation/devicetree/bindings/arc/hsdk.txt b/Documentation/devicetree/bindings/arc/hsdk.txt new file mode 100644 index 000000000..be50654bb --- /dev/null +++ b/Documentation/devicetree/bindings/arc/hsdk.txt @@ -0,0 +1,7 @@ +Synopsys DesignWare ARC HS Development Kit Device Tree Bindings +--------------------------------------------------------------------------- + +ARC HSDK Board with quad-core ARC HS38x4 in silicon. + +Required root node properties: + - compatible = "snps,hsdk"; diff --git a/Documentation/devicetree/bindings/arc/pct.txt b/Documentation/devicetree/bindings/arc/pct.txt new file mode 100644 index 000000000..4e874d9a3 --- /dev/null +++ b/Documentation/devicetree/bindings/arc/pct.txt @@ -0,0 +1,20 @@ +* ARC Performance Counters + +The ARC700 can be configured with a pipeline performance monitor for counting +CPU and cache events like cache misses and hits. Like conventional PCT there +are 100+ hardware conditions dynamically mapped to up to 32 counters + +Note that: + * The ARC 700 PCT does not support interrupts; although HW events may be + counted, the HW events themselves cannot serve as a trigger for a sample. + +Required properties: + +- compatible : should contain + "snps,arc700-pct" + +Example: + +pmu { + compatible = "snps,arc700-pct"; +}; diff --git a/Documentation/devicetree/bindings/arc/snps,archs-pct.yaml b/Documentation/devicetree/bindings/arc/snps,archs-pct.yaml new file mode 100644 index 000000000..532f7584f --- /dev/null +++ b/Documentation/devicetree/bindings/arc/snps,archs-pct.yaml @@ -0,0 +1,33 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/arc/snps,archs-pct.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ARC HS Performance Counters + +maintainers: + - Aryabhatta Dey + +description: + The ARC HS can be configured with a pipeline performance monitor for counting + CPU and cache events like cache misses and hits. Like conventional PCT there + are 100+ hardware conditions dynamically mapped to up to 32 counters. + It also supports overflow interrupts. + +properties: + compatible: + const: snps,archs-pct + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + +required: + - compatible + - reg + - clocks + +additionalProperties: false -- cgit v1.3.1