powerpc: Allow the max stack trace depth to be configured

On my screen, when something crashes, I only have space for maybe 16
functions of the stack trace before the information above it scrolls
off the screen.  It's easy to hack the kernel to print out only that
much, but it's harder to remember to do it.  This introduces a config
option for it so that I can keep the setting in my config.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index 15eb27861fc713c1b02995fd030bc139652b24d2..08f7cc0a1953a2c3bae6c88e165f44e50379c23d 100644 (file)
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -2,6 +2,15 @@ menu "Kernel hacking"
 
 source "lib/Kconfig.debug"
 
+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. This can be useful if your display is
+         too small and stack traces cause important information to
+         scroll off the screen.
+
 config DEBUG_STACKOVERFLOW
        bool "Check for stack overflows"
        depends on DEBUG_KERNEL

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index b0383236dd070ea22f5b25ca22b71406088bc38a..51b201ddf9a160002d10ff3c61cd9bb2e40119a5 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1000,7 +1000,7 @@ unsigned long get_wchan(struct task_struct *p)
        return 0;
 }
 
-static int kstack_depth_to_print = 64;
+static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH;
 
 void show_stack(struct task_struct *tsk, unsigned long *stack)
 {