markers: Add samples subdir

[sfrench/cifs-2.6.git] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 50a94eee4d92565e2f247eac3c92ca80c7d45581..c567f219191d590116bcdd4498349d72e62ce612 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -167,7 +167,7 @@ config SLUB_DEBUG_ON
 
 config DEBUG_PREEMPT
        bool "Debug preemptible kernel"
-       depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
+       depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
        default y
        help
          If you say Y here then the kernel will use a debug variant of the
@@ -284,7 +284,7 @@ config LOCKDEP
        select KALLSYMS_ALL
 
 config LOCK_STAT
-       bool "Lock usage statisitics"
+       bool "Lock usage statistics"
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select LOCKDEP
        select DEBUG_SPINLOCK
@@ -294,6 +294,8 @@ config LOCK_STAT
        help
         This feature enables tracking lock contention points
 
+        For more details, see Documentation/lockstat.txt
+
 config DEBUG_LOCKDEP
        bool "Lock dependency engine debugging"
        depends on DEBUG_KERNEL && LOCKDEP
@@ -411,6 +413,24 @@ config FORCED_INLINING
          become the default in the future, until then this option is there to
          test gcc for this.
 
+config BOOT_PRINTK_DELAY
+       bool "Delay each boot printk message by N milliseconds"
+       depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
+       help
+         This build option allows you to read kernel boot messages
+         by inserting a short delay after each one.  The delay is
+         specified in milliseconds on the kernel command line,
+         using "boot_delay=N".
+
+         It is likely that you would also need to use "lpj=M" to preset
+         the "loops per jiffie" value.
+         See a previous boot log for the "lpj" value to use for your
+         system, and then set "lpj=M" before setting "boot_delay=N".
+         NOTE:  Using this option may adversely affect SMP systems.
+         I.e., processors other than the first one may not boot up.
+         BOOT_PRINTK_DELAY also may cause DETECT_SOFTLOCKUP to detect
+         what it believes to be lockup conditions.
+
 config RCU_TORTURE_TEST
        tristate "torture tests for RCU"
        depends on DEBUG_KERNEL
@@ -478,3 +498,5 @@ config FAULT_INJECTION_STACKTRACE_FILTER
        select FRAME_POINTER
        help
          Provide stacktrace filter for fault-injection capabilities
+
+source "samples/Kconfig"