linux-kernel - [PATCH v3 2/2] xtensa: make stack dump size configurable

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Date:   Tue, 12 Nov 2019 14:44:43 -0800
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Dmitry Safonov <dima@...sta.com>,
        Petr Mladek <pmladek@...e.com>, Joe Perches <joe@...ches.com>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH v3 2/2] xtensa: make stack dump size configurable

Introduce Kconfig symbol PRINT_STACK_DEPTH and use it to initialize
kstack_depth_to_print.

Reviewed-by: Petr Mladek <pmladek@...e.com>
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
Changes v2->v3:
- split Kconfig change into separate patch

 arch/xtensa/Kconfig.debug  | 7 +++++++
 arch/xtensa/kernel/traps.c | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/xtensa/Kconfig.debug b/arch/xtensa/Kconfig.debug
index 39de98e20018..83cc8d12fa0e 100644
--- a/arch/xtensa/Kconfig.debug
+++ b/arch/xtensa/Kconfig.debug
@@ -31,3 +31,10 @@ config S32C1I_SELFTEST
 	  It is easy to make wrong hardware configuration, this test should catch it early.
 
 	  Say 'N' on stable hardware.
+
+config PRINT_STACK_DEPTH
+	int "Stack depth to print" if DEBUG_KERNEL
+	default 64
+	help
+	  This option allows you to set the stack depth that the kernel
+	  prints in stack traces.
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index be26ec6c0e0e..87bd68dd7687 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -495,7 +495,7 @@ void show_trace(struct task_struct *task, unsigned long *sp)
 
 #define STACK_DUMP_ENTRY_SIZE 4
 #define STACK_DUMP_LINE_SIZE 32
-static size_t kstack_depth_to_print = 24;
+static size_t kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
 
 void show_stack(struct task_struct *task, unsigned long *sp)
 {
-- 
2.20.1