[PATCH v1 02/10] kconfig-checker: Introduce PREEMPT_RT configuration rules

[Ahmed S. Darwish]

Introduce a kconfig-checker PREEMPT_RT rules file, matching what is at
Documentation/core-api/real-time/kernel-configuration.rst.

This will allow the tool to mechanically check the kernel's .config at a
later step.

Signed-off-by: Ahmed S. Darwish <darwi@xxxxxxxxxxxxx>
---
 tools/kconfig-checker/rules/preempt_rt.yml | 169 +++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 tools/kconfig-checker/rules/preempt_rt.yml

diff --git a/tools/kconfig-checker/rules/preempt_rt.yml b/tools/kconfig-checker/rules/preempt_rt.yml
new file mode 100644
index 000000000000..5c1b80adc846
--- /dev/null
+++ b/tools/kconfig-checker/rules/preempt_rt.yml
@@ -0,0 +1,169 @@
+# PREEMPT_RT .config sanitization
+#
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# List all config options in alphabetic order, per group
+---
+
+docs_url: https://docs.kernel.org/core-api/real-time/kernel-configuration.html
+rules:
+  - name: CONFIG_CPU_FREQ
+    expected: y
+    severity: high
+    docs_hint: config
+
+  - name: CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
+    expected: y
+    severity: high
+    docs_hint: config
+
+  - name_pattern: CONFIG_CPU_FREQ_GOV_(CONSERVATIVE|ONDEMAND|POWERSAVE|USERSPACE)
+    expected: n
+    severity: medium
+    docs_hint: non-performance-cpu-frequency-governors
+
+  - name: CONFIG_CPU_FREQ_GOV_SCHEDUTIL
+    expected: n
+    severity: medium
+    docs_hint: non-performance-cpu-frequency-governors
+
+  - name: CONFIG_CPU_IDLE
+    expected: y
+    severity: info
+    docs_hint: config
+
+  - name: CONFIG_DRM
+    expected: n
+    severity: info
+    docs_hint: config
+
+  - name: CONFIG_EFI_DISABLE_RUNTIME
+    expected: y
+    severity: medium
+    docs_hint: config
+
+  - name: CONFIG_NO_HZ
+    expected: n
+    severity: medium
+    docs_hint: config-no-hz-config-no-hz-full
+
+  - name: CONFIG_NO_HZ_FULL
+    expected: n
+    severity: medium
+    docs_hint: config-no-hz-config-no-hz-full
+
+  - name: CONFIG_PREEMPT_RT
+    expected: y
+    severity: fatal
+    docs_hint: config
+
+  #
+  # Tracing
+  #
+
+  - name: CONFIG_DYNAMIC_FTRACE
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_FUNCTION_GRAPH_TRACER
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_HWLAT_TRACER
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_IRQSOFF_TRACER
+    expected: n
+    severity: high
+    docs_hint: config-irqsoff-tracer-and-config-preempt-tracer
+
+  - name: CONFIG_KPROBE_EVENTS
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_PREEMPT_TRACER
+    expected: n
+    severity: high
+    docs_hint: config-irqsoff-tracer-and-config-preempt-tracer
+
+  - name: CONFIG_SCHED_TRACER
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_TRACING
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  - name: CONFIG_UPROBE_EVENTS
+    expected: y
+    severity: info
+    docs_hint: config-tracing-and-tracing-options
+
+  #
+  # Debugging
+  #
+
+  - name_pattern: CONFIG_DEBUG_.*
+    expected: n
+    severity: medium
+    docs_hint: kernel-debug-options
+
+  - name: CONFIG_DEBUG_ATOMIC_SLEEP
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_BOOT_PARAMS
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_BUGVERBOSE
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_FS
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_FS_ALLOW_ALL
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_INFO
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_INFO_NONE
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_KERNEL
+    expected: allowed
+    severity: low
+
+  - name: CONFIG_DEBUG_MISC
+    expected: allowed
+    severity: low
+    rationale:
+      A menu option which enables the display of other debug symbols.
+
+  - name: CONFIG_LOCKUP_DETECTOR
+    expected: n
+    severity: high
+    docs_hint: config
+
+  - name: CONFIG_PROVE_LOCKING
+    expected: n
+    severity: high
+    docs_hint: config
+
+  - name_pattern: CONFIG_SLUB_DEBUG.*
+    expected: n
+    severity: high
+    docs_hint: kernel-debug-options
-- 
2.56.0