From: Anton Blanchard <anton@samba.org>
Add DEBUG_STACK_USAGE to ppc64
---
arch/ppc64/Kconfig | 9 +++++++++
include/asm-ppc64/thread_info.h | 15 ++++++++++++++-
2 files changed, 23 insertions(+), 1 deletion(-)
diff -puN arch/ppc64/Kconfig~ppc64-debug-stack-usage arch/ppc64/Kconfig
--- 25/arch/ppc64/Kconfig~ppc64-debug-stack-usage 2004-02-21 20:58:20.000000000 -0800
+++ 25-akpm/arch/ppc64/Kconfig 2004-02-21 20:58:20.000000000 -0800
@@ -316,6 +316,15 @@ config DEBUG_KERNEL
Say Y here if you are developing drivers or trying to debug and
identify kernel problems.
+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_SLAB
bool "Debug memory allocations"
depends on DEBUG_KERNEL
diff -puN include/asm-ppc64/thread_info.h~ppc64-debug-stack-usage include/asm-ppc64/thread_info.h
--- 25/include/asm-ppc64/thread_info.h~ppc64-debug-stack-usage 2004-02-21 20:58:20.000000000 -0800
+++ 25-akpm/include/asm-ppc64/thread_info.h 2004-02-21 20:58:20.000000000 -0800
@@ -11,6 +11,7 @@
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
+#include <linux/config.h>
#include <asm/processor.h>
#include <linux/stringify.h>
@@ -51,7 +52,19 @@ struct thread_info {
#define THREAD_ORDER 2
#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
#define THREAD_SHIFT (PAGE_SHIFT + THREAD_ORDER)
-#define alloc_thread_info(task) ((struct thread_info *)kmalloc(THREAD_SIZE, GFP_KERNEL))
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk) \
+ ({ \
+ struct thread_info *ret; \
+ \
+ ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
+ if (ret) \
+ memset(ret, 0, THREAD_SIZE); \
+ ret; \
+ })
+#else
+#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
+#endif
#define free_thread_info(ti) kfree(ti)
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)
_