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[v2] powerpc/configs: Add debug configs for debugging

Message ID 20260827121309.94434-1-gautam@linux.ibm.com (mailing list archive)
State New
Headers show
Series [v2] powerpc/configs: Add debug configs for debugging | expand

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Commit Message

Gautam Menghani Aug. 27, 2026, 12:13 p.m. UTC 
Kernel has multiple config options to run extra validation checks that
can help catch bugs. Define new configs for major subsystems to
make it easy to enable the debug config options for a given area.

Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
---
v1 -> v2:
1. Split the enablement of configs into pseries and powernv configs.

 arch/powerpc/Makefile                    | 32 ++++++++++++++++++++++++
 arch/powerpc/configs/common_debug.config | 11 ++++++++
 arch/powerpc/configs/locks_debug.config  | 13 ++++++++++
 arch/powerpc/configs/lockup_debug.config |  4 +++
 arch/powerpc/configs/mm_debug.config     | 24 ++++++++++++++++++
 5 files changed, 84 insertions(+)
 create mode 100644 arch/powerpc/configs/common_debug.config
 create mode 100644 arch/powerpc/configs/locks_debug.config
 create mode 100644 arch/powerpc/configs/lockup_debug.config
 create mode 100644 arch/powerpc/configs/mm_debug.config

--
2.54.0

Comments

Mukesh Kumar Chaurasiya Aug. 31, 2026, 4:58 a.m. UTC | #1 
On Thu, Aug 27, 2026 at 05:43:08PM +0530, Gautam Menghani wrote:
> Kernel has multiple config options to run extra validation checks that
> can help catch bugs. Define new configs for major subsystems to
> make it easy to enable the debug config options for a given area.
> 
> Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
> ---
> v1 -> v2:
> 1. Split the enablement of configs into pseries and powernv configs.
> 
>  arch/powerpc/Makefile                    | 32 ++++++++++++++++++++++++
>  arch/powerpc/configs/common_debug.config | 11 ++++++++
>  arch/powerpc/configs/locks_debug.config  | 13 ++++++++++
>  arch/powerpc/configs/lockup_debug.config |  4 +++
>  arch/powerpc/configs/mm_debug.config     | 24 ++++++++++++++++++
>  5 files changed, 84 insertions(+)
>  create mode 100644 arch/powerpc/configs/common_debug.config
>  create mode 100644 arch/powerpc/configs/locks_debug.config
>  create mode 100644 arch/powerpc/configs/lockup_debug.config
>  create mode 100644 arch/powerpc/configs/mm_debug.config
> 
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 9385db478c59..818aacace875 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -352,6 +352,38 @@ ppc64_randconfig:
>  	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
>  		-f $(srctree)/Makefile randconfig
> 
> +generated_configs += pseries_debug_defconfig
> +pseries_debug_defconfig:
> +	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest common_debug)
> +
> +generated_configs += pseries_locks_debug_defconfig
> +pseries_locks_debug_defconfig:
> +	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest locks_debug)
> +
> +generated_configs += pseries_mm_debug_defconfig
> +pseries_mm_debug_defconfig:
> +	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest mm_debug)
> +
> +generated_configs += pseries_lockup_debug_defconfig
> +pseries_lockup_debug_defconfig:
> +	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest lockup_debug)
> +
> +generated_configs += powernv_debug_defconfig
> +powernv_debug_defconfig:
> +	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest common_debug)
> +
> +generated_configs += powernv_locks_debug_defconfig
> +powernv_locks_debug_defconfig:
> +	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest locks_debug)
> +
> +generated_configs += powernv_mm_debug_defconfig
> +powernv_mm_debug_defconfig:
> +	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest mm_debug)
> +
> +generated_configs += powernv_lockup_debug_defconfig
> +powernv_lockup_debug_defconfig:
> +	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest lockup_debug)
> +
>  PHONY += $(generated_configs)
> 
>  define archhelp
> diff --git a/arch/powerpc/configs/common_debug.config b/arch/powerpc/configs/common_debug.config
> new file mode 100644
> index 000000000000..a341c8b41468
> --- /dev/null
> +++ b/arch/powerpc/configs/common_debug.config
> @@ -0,0 +1,11 @@
> +# For use in CI testing
> +CONFIG_EXPERT=y
> +CONFIG_PROVE_LOCKING=y
> +CONFIG_PROVE_RCU=y
> +CONFIG_KASAN=y
> +CONFIG_UBSAN=y
> +CONFIG_DEBUG_PAGEALLOC=y
> +CONFIG_DEBUG_VM=y
> +CONFIG_DEBUG_OBJECTS=y
> +CONFIG_DEBUG_KMEMLEAK=y
> +CONFIG_DEBUG_STACKOVERFLOW=y
> diff --git a/arch/powerpc/configs/locks_debug.config b/arch/powerpc/configs/locks_debug.config
> new file mode 100644
> index 000000000000..b2cb23de75db
> --- /dev/null
> +++ b/arch/powerpc/configs/locks_debug.config
> @@ -0,0 +1,13 @@
> +CONFIG_EXPERT=y
> +CONFIG_PROVE_LOCKING=y
> +CONFIG_DEBUG_LOCK_ALLOC=y
> +CONFIG_DEBUG_ATOMIC_SLEEP=y
> +CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
> +CONFIG_DEBUG_MUTEXES=y
> +CONFIG_DEBUG_SPINLOCK=y
> +CONFIG_DEBUG_RT_MUTEXES=y
> +CONFIG_DEBUG_RWSEMS=y
> +CONFIG_PROVE_RAW_LOCK_NESTING=y
> +CONFIG_RCU_EXPERT=y
> +CONFIG_PROVE_RCU=y
> +CONFIG_RCU_TRACE=y
> diff --git a/arch/powerpc/configs/lockup_debug.config b/arch/powerpc/configs/lockup_debug.config
> new file mode 100644
> index 000000000000..ad0a79abf60f
> --- /dev/null
> +++ b/arch/powerpc/configs/lockup_debug.config
> @@ -0,0 +1,4 @@
> +CONFIG_EXPERT=y
> +CONFIG_WQ_WATCHDOG=y
> +CONFIG_DETECT_HUNG_TASK=y
> +CONFIG_PANIC_ON_OOPS=y
> diff --git a/arch/powerpc/configs/mm_debug.config b/arch/powerpc/configs/mm_debug.config
> new file mode 100644
> index 000000000000..0e88eb983536
> --- /dev/null
> +++ b/arch/powerpc/configs/mm_debug.config
> @@ -0,0 +1,24 @@
> +CONFIG_EXPERT=y
> +CONFIG_DEBUG_PAGEALLOC=y
> +CONFIG_DEBUG_SLAB=y
> +CONFIG_KASAN=y
> +CONFIG_KFENCE=y
> +CONFIG_KMSAN=y
> +CONFIG_DEBUG_KMEMLEAK=y
> +CONFIG_DEBUG_VM=y
> +CONFIG_DEBUG_VIRTUAL=y
> +CONFIG_DEBUG_OBJECTS=y
> +CONFIG_DEBUG_OBJECTS_FREE=y
> +CONFIG_DEBUG_OBJECTS_TIMERS=y
> +CONFIG_DEBUG_OBJECTS_WORK=y
> +CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
> +CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y
> +CONFIG_SCHED_STACK_END_CHECK=y
> +CONFIG_DEBUG_VM_MAPLE_TREE=y
> +CONFIG_DEBUG_VM_RB=y
> +CONFIG_DEBUG_VM_PGFLAGS=y
> +CONFIG_DEBUG_MEMORY_INIT=y
> +CONFIG_DEBUG_PER_CPU_MAPS=y
> +CONFIG_DEBUG_KMAP_LOCAL=y
> +CONFIG_DEBUG_HIGHMEM=y
> +CONFIG_DEBUG_STACKOVERFLOW=y
> --
> 2.54.0
> 

Thanks Gautam for this. we'll be able to catch a lot of issues earlier
with this.

Reviewed-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
diff mbox series

Patch

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 9385db478c59..818aacace875 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -352,6 +352,38 @@  ppc64_randconfig:
 	$(Q)$(MAKE) KCONFIG_ALLCONFIG=$(srctree)/arch/powerpc/configs/64-bit.config \
 		-f $(srctree)/Makefile randconfig

+generated_configs += pseries_debug_defconfig
+pseries_debug_defconfig:
+	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest common_debug)
+
+generated_configs += pseries_locks_debug_defconfig
+pseries_locks_debug_defconfig:
+	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest locks_debug)
+
+generated_configs += pseries_mm_debug_defconfig
+pseries_mm_debug_defconfig:
+	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest mm_debug)
+
+generated_configs += pseries_lockup_debug_defconfig
+pseries_lockup_debug_defconfig:
+	$(call merge_into_defconfig,ppc64_defconfig,le guest kvm_guest lockup_debug)
+
+generated_configs += powernv_debug_defconfig
+powernv_debug_defconfig:
+	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest common_debug)
+
+generated_configs += powernv_locks_debug_defconfig
+powernv_locks_debug_defconfig:
+	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest locks_debug)
+
+generated_configs += powernv_mm_debug_defconfig
+powernv_mm_debug_defconfig:
+	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest mm_debug)
+
+generated_configs += powernv_lockup_debug_defconfig
+powernv_lockup_debug_defconfig:
+	$(call merge_into_defconfig,powernv_defconfig,le guest kvm_guest lockup_debug)
+
 PHONY += $(generated_configs)

 define archhelp
diff --git a/arch/powerpc/configs/common_debug.config b/arch/powerpc/configs/common_debug.config
new file mode 100644
index 000000000000..a341c8b41468
--- /dev/null
+++ b/arch/powerpc/configs/common_debug.config
@@ -0,0 +1,11 @@ 
+# For use in CI testing
+CONFIG_EXPERT=y
+CONFIG_PROVE_LOCKING=y
+CONFIG_PROVE_RCU=y
+CONFIG_KASAN=y
+CONFIG_UBSAN=y
+CONFIG_DEBUG_PAGEALLOC=y
+CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_OBJECTS=y
+CONFIG_DEBUG_KMEMLEAK=y
+CONFIG_DEBUG_STACKOVERFLOW=y
diff --git a/arch/powerpc/configs/locks_debug.config b/arch/powerpc/configs/locks_debug.config
new file mode 100644
index 000000000000..b2cb23de75db
--- /dev/null
+++ b/arch/powerpc/configs/locks_debug.config
@@ -0,0 +1,13 @@ 
+CONFIG_EXPERT=y
+CONFIG_PROVE_LOCKING=y
+CONFIG_DEBUG_LOCK_ALLOC=y
+CONFIG_DEBUG_ATOMIC_SLEEP=y
+CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_RWSEMS=y
+CONFIG_PROVE_RAW_LOCK_NESTING=y
+CONFIG_RCU_EXPERT=y
+CONFIG_PROVE_RCU=y
+CONFIG_RCU_TRACE=y
diff --git a/arch/powerpc/configs/lockup_debug.config b/arch/powerpc/configs/lockup_debug.config
new file mode 100644
index 000000000000..ad0a79abf60f
--- /dev/null
+++ b/arch/powerpc/configs/lockup_debug.config
@@ -0,0 +1,4 @@ 
+CONFIG_EXPERT=y
+CONFIG_WQ_WATCHDOG=y
+CONFIG_DETECT_HUNG_TASK=y
+CONFIG_PANIC_ON_OOPS=y
diff --git a/arch/powerpc/configs/mm_debug.config b/arch/powerpc/configs/mm_debug.config
new file mode 100644
index 000000000000..0e88eb983536
--- /dev/null
+++ b/arch/powerpc/configs/mm_debug.config
@@ -0,0 +1,24 @@ 
+CONFIG_EXPERT=y
+CONFIG_DEBUG_PAGEALLOC=y
+CONFIG_DEBUG_SLAB=y
+CONFIG_KASAN=y
+CONFIG_KFENCE=y
+CONFIG_KMSAN=y
+CONFIG_DEBUG_KMEMLEAK=y
+CONFIG_DEBUG_VM=y
+CONFIG_DEBUG_VIRTUAL=y
+CONFIG_DEBUG_OBJECTS=y
+CONFIG_DEBUG_OBJECTS_FREE=y
+CONFIG_DEBUG_OBJECTS_TIMERS=y
+CONFIG_DEBUG_OBJECTS_WORK=y
+CONFIG_DEBUG_OBJECTS_RCU_HEAD=y
+CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER=y
+CONFIG_SCHED_STACK_END_CHECK=y
+CONFIG_DEBUG_VM_MAPLE_TREE=y
+CONFIG_DEBUG_VM_RB=y
+CONFIG_DEBUG_VM_PGFLAGS=y
+CONFIG_DEBUG_MEMORY_INIT=y
+CONFIG_DEBUG_PER_CPU_MAPS=y
+CONFIG_DEBUG_KMAP_LOCAL=y
+CONFIG_DEBUG_HIGHMEM=y
+CONFIG_DEBUG_STACKOVERFLOW=y