From: Steven Rostedt Date: Thu, 26 Mar 2009 00:55:00 +0000 (-0400) Subject: function-graph: add proper initialization for init task X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=5ac9f62267dc92c7735c642a5942d9e6c1190308;p=linux-2.6-omap-h63xx.git function-graph: add proper initialization for init task Impact: fix to crash going to kexec The init task did not properly initialize the function graph pointers. Altough these pointers are NULL, they can not be assumed to be NULL for the init task, and must still be properly initialize. This usually is not an issue since a problem only arises when a task exits, and the init tasks do not usually exit. But when doing tests with kexec, the init tasks do exit, and the bug appears. This patch properly initializes the init tasks function graph data structures. Reported-and-Tested-by: Yinghai Lu LKML-Reference: Signed-off-by: Steven Rostedt Signed-off-by: Ingo Molnar --- diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 015a3d22cf7..da5405dce34 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -356,6 +356,9 @@ struct ftrace_graph_ret { #ifdef CONFIG_FUNCTION_GRAPH_TRACER +/* for init task */ +#define INIT_FTRACE_GRAPH .ret_stack = NULL + /* * Stack of return addresses for functions * of a thread. @@ -430,10 +433,11 @@ static inline void unpause_graph_tracing(void) { atomic_dec(¤t->tracing_graph_pause); } -#else +#else /* !CONFIG_FUNCTION_GRAPH_TRACER */ #define __notrace_funcgraph #define __irq_entry +#define INIT_FTRACE_GRAPH static inline void ftrace_graph_init_task(struct task_struct *t) { } static inline void ftrace_graph_exit_task(struct task_struct *t) { } @@ -445,7 +449,7 @@ static inline int task_curr_ret_stack(struct task_struct *tsk) static inline void pause_graph_tracing(void) { } static inline void unpause_graph_tracing(void) { } -#endif +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #ifdef CONFIG_TRACING #include diff --git a/include/linux/init_task.h b/include/linux/init_task.h index e752d973fa2..cada05447bc 100644 --- a/include/linux/init_task.h +++ b/include/linux/init_task.h @@ -5,6 +5,7 @@ #include #include #include +#include #include #include #include @@ -184,6 +185,7 @@ extern struct cred init_cred; INIT_IDS \ INIT_TRACE_IRQFLAGS \ INIT_LOCKDEP \ + INIT_FTRACE_GRAPH \ }