1 files changed, 17 insertions, 2 deletions

diff --git a/include/asm-x86_64/thread_info.h b/include/asm-x86_64/thread_info.h
index 4ac0e0a36934..2029b00351f3 100644
--- a/include/asm-x86_64/thread_info.h
+++ b/include/asm-x86_64/thread_info.h
@@ -73,8 +73,21 @@ static inline struct thread_info *stack_thread_info(void)
 }
 
 /* thread information allocation */
+#ifdef CONFIG_DEBUG_STACK_USAGE
+#define alloc_thread_info(tsk)                                  \
+    ({                                                          \
+        struct thread_info *ret;                                \
+                                                                \
+        ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
+        if (ret)                                                \
+                memset(ret, 0, THREAD_SIZE);                    \
+        ret;                                                    \
+    })
+#else
 #define alloc_thread_info(tsk) \
         ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
+#endif
+
 #define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
 
 #else /* !__ASSEMBLY__ */
@@ -101,7 +114,7 @@ static inline struct thread_info *stack_thread_info(void)
 #define TIF_IRET                5       /* force IRET */
 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
 #define TIF_SECCOMP             8       /* secure computing */
-#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
+/* 16 free */
 #define TIF_IA32                17      /* 32bit process */ 
 #define TIF_FORK                18      /* ret_from_fork */
 #define TIF_ABI_PENDING         19
@@ -115,7 +128,6 @@ static inline struct thread_info *stack_thread_info(void)
 #define _TIF_IRET               (1<<TIF_IRET)
 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
-#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 #define _TIF_IA32               (1<<TIF_IA32)
 #define _TIF_FORK               (1<<TIF_FORK)
 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
@@ -137,6 +149,9 @@ static inline struct thread_info *stack_thread_info(void)
  */
 #define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 #define TS_COMPAT               0x0002  /* 32bit syscall active */
+#define TS_POLLING              0x0004  /* true if in idle loop and not sleeping */
+
+#define tsk_is_polling(t) ((t)->thread_info->status & TS_POLLING)
 
 #endif /* __KERNEL__ */