lib: consolidate DEBUG_STACK_USAGE option

Most arches define CONFIG_DEBUG_STACK_USAGE exactly the same way.  Move it
to lib/Kconfig.debug so each arch doesn't have to define it.  This
obviously makes the option generic, but that's fine because the config is
already used in generic code.

It's not obvious to me that sysrq-P actually does anything caution by
keeping the most inclusive wording.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Richard Weinberger <richard@nod.at>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

13 files changed, 9 insertions, 105 deletions

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 03d01d783e3..81cbe40c159 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -63,13 +63,6 @@ config DEBUG_USER
               8 - SIGSEGV faults
              16 - SIGBUS faults
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T output.
-
 # These options are only for real kernel hackers who want to get their hands dirty.
 config DEBUG_LL
         bool "Kernel low-level debugging functions"
diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug
index 2641731f24c..19ccfb3b67d 100644
--- a/arch/blackfin/Kconfig.debug
+++ b/arch/blackfin/Kconfig.debug
@@ -9,15 +9,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T output.
-
-          This option will slow down process creation somewhat.
-
 config DEBUG_VERBOSE
         bool "Verbose fault messages"
         default y
diff --git a/arch/m32r/Kconfig.debug b/arch/m32r/Kconfig.debug
index 2e1019ddbb2..bb1afc1a31c 100644
--- a/arch/m32r/Kconfig.debug
+++ b/arch/m32r/Kconfig.debug
@@ -9,15 +9,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config DEBUG_PAGEALLOC
         bool "Debug page memory allocations"
         depends on DEBUG_KERNEL && BROKEN
diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index 5358f90b4dd..83ed00a5644 100644
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -76,15 +76,6 @@ config DEBUG_STACKOVERFLOW
           provides another way to check stack overflow happened on kernel mode
           stack usually caused by nested interruption.
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config SMTC_IDLE_HOOK_DEBUG
         bool "Enable additional debug checks before going into CPU idle loop"
         depends on DEBUG_KERNEL && MIPS_MT_SMTC
diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug
index e1890e6d31b..e72dcf6a421 100644
--- a/arch/powerpc/Kconfig.debug
+++ b/arch/powerpc/Kconfig.debug
@@ -35,15 +35,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config HCALL_STATS
         bool "Hypervisor call instrumentation"
         depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
diff --git a/arch/score/Kconfig.debug b/arch/score/Kconfig.debug
index 451ed54ce64..a1f346df0a7 100644
--- a/arch/score/Kconfig.debug
+++ b/arch/score/Kconfig.debug
@@ -16,15 +16,6 @@ config CMDLINE
           other cases you can specify kernel args so that you don't have
           to set them up in board prom initialization routines.
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config RUNTIME_DEBUG
         bool "Enable run-time debugging"
         depends on DEBUG_KERNEL
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index 1553d56cf4e..c1d5a820b1a 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -28,15 +28,6 @@ config STACK_DEBUG
           every function call and will therefore incur a major
           performance hit. Most users should say N.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config 4KSTACKS
         bool "Use 4Kb for kernel stacks instead of 8Kb"
         depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
index d9a795efbc0..6db35fba79f 100644
--- a/arch/sparc/Kconfig.debug
+++ b/arch/sparc/Kconfig.debug
@@ -6,15 +6,6 @@ config TRACE_IRQFLAGS_SUPPORT
 
 source "lib/Kconfig.debug"
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config DEBUG_DCFLUSH
         bool "D-cache flush debugging"
         depends on SPARC64 && DEBUG_KERNEL
diff --git a/arch/tile/Kconfig.debug b/arch/tile/Kconfig.debug
index 9bc161a02c7..ddbfc3322d7 100644
--- a/arch/tile/Kconfig.debug
+++ b/arch/tile/Kconfig.debug
@@ -21,15 +21,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config DEBUG_EXTRA_FLAGS
         string "Additional compiler arguments when building with '-g'"
         depends on DEBUG_INFO
diff --git a/arch/um/Kconfig.debug b/arch/um/Kconfig.debug
index 85c86edd1e6..68205fd3b08 100644
--- a/arch/um/Kconfig.debug
+++ b/arch/um/Kconfig.debug
@@ -28,16 +28,6 @@ config GCOV
           If you're involved in UML kernel development and want to use gcov,
           say Y.  If you're unsure, say N.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        default N
-        help
-          Track the maximum kernel stack usage - this will look at each
-          kernel stack at process exit and log it if it's the deepest
-          stack seen so far.
-
-          This option will slow down process creation and destruction somewhat.
-
 config EARLY_PRINTK
         bool "Early printk"
         default y
diff --git a/arch/unicore32/Kconfig.debug b/arch/unicore32/Kconfig.debug
index 3140151ede4..ae2ec334c3c 100644
--- a/arch/unicore32/Kconfig.debug
+++ b/arch/unicore32/Kconfig.debug
@@ -27,13 +27,6 @@ config EARLY_PRINTK
           with klogd/syslogd or the X server. You should normally N here,
           unless you want to debug such a crash.
 
-config DEBUG_STACK_USAGE
-        bool "Enable stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        help
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T output.
-
 # These options are only for real kernel hackers who want to get their hands dirty.
 config DEBUG_LL
         bool "Kernel low-level debugging functions"
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 1bf88396ba2..c0f8a5c8891 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -66,15 +66,6 @@ config DEBUG_STACKOVERFLOW
           This option will cause messages to be printed if free stack space
           drops below a certain limit.
 
-config DEBUG_STACK_USAGE
-        bool "Stack utilization instrumentation"
-        depends on DEBUG_KERNEL
-        ---help---
-          Enables the display of the minimum amount of free stack which each
-          task has ever had available in the sysrq-T and sysrq-P debug output.
-
-          This option will slow down process creation somewhat.
-
 config X86_PTDUMP
         bool "Export kernel pagetable layout to userspace via debugfs"
         depends on DEBUG_KERNEL
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 09596e01468..28afa4c5333 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -670,6 +670,15 @@ config STACKTRACE
         bool
         depends on STACKTRACE_SUPPORT
 
+config DEBUG_STACK_USAGE
+        bool "Stack utilization instrumentation"
+        depends on DEBUG_KERNEL
+        help
+          Enables the display of the minimum amount of free stack which each
+          task has ever had available in the sysrq-T and sysrq-P debug output.
+
+          This option will slow down process creation somewhat.
+
 config DEBUG_KOBJECT
         bool "kobject debugging"
         depends on DEBUG_KERNEL