Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE

Add generic exit-time stack-depth checking to CONFIG_DEBUG_STACK_USAGE.

This also adds UML support.

Tested on UML and i386.

[akpm@linux-foundation.org: cleanups, speedups, tweaks]
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/asm-um/thread_info.h b/include/asm-um/thread_info.h
index 07aa4e50e4d0..6e5fd5c892d0 100644
--- a/include/asm-um/thread_info.h
+++ b/include/asm-um/thread_info.h
@@ -52,10 +52,19 @@ static inline struct thread_info *current_thread_info(void)
         return ti;
 }
 
+#ifdef CONFIG_DEBUG_STACK_USAGE
+
+#define alloc_thread_info(tsk) \
+        ((struct thread_info *) __get_free_pages(GFP_KERNEL | __GFP_ZERO, \
+                                                 CONFIG_KERNEL_STACK_ORDER))
+#else
+
 /* thread information allocation */
 #define alloc_thread_info(tsk) \
         ((struct thread_info *) __get_free_pages(GFP_KERNEL, \
                                                  CONFIG_KERNEL_STACK_ORDER))
+#endif
+
 #define free_thread_info(ti) \
         free_pages((unsigned long)(ti),CONFIG_KERNEL_STACK_ORDER)