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Commit 6cafbe15 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
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ftrace: Add a ftrace_free_mem() function for modules to use 



In order to be able to trace module init functions, the module code needs to
tell ftrace what is being freed when the init sections are freed. Use the
code that the main init calls to tell ftrace to free the main init sections.
This requires passing in a start and end address to free.

Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 5819eadd

include/linux/ftrace.h

+2 −0
Original line number Diff line number Diff line
@@ -151,8 +151,10 @@ struct ftrace_ops_hash { 
};



void ftrace_free_init_mem(void);

void ftrace_free_mem(void *start, void *end);

#else

static inline void ftrace_free_init_mem(void) { }

static inline void ftrace_free_mem(void *start, void *end) { }

#endif



/*

kernel/trace/ftrace.c

+11 −3
Original line number Diff line number Diff line
@@ -5868,10 +5868,10 @@ void ftrace_module_init(struct module *mod) 
}

#endif /* CONFIG_MODULES */



void __init ftrace_free_init_mem(void)

void ftrace_free_mem(void *start_ptr, void *end_ptr)

{

	unsigned long start = (unsigned long)(&__init_begin);

	unsigned long end = (unsigned long)(&__init_end);

	unsigned long start = (unsigned long)(start_ptr);

	unsigned long end = (unsigned long)(end_ptr);

	struct ftrace_page **last_pg = &ftrace_pages_start;

	struct ftrace_page *pg;

	struct dyn_ftrace *rec;
@@ -5913,6 +5913,14 @@ void __init ftrace_free_init_mem(void) 
	mutex_unlock(&ftrace_lock);

}



void __init ftrace_free_init_mem(void)

{

	void *start = (void *)(&__init_begin);

	void *end = (void *)(&__init_end);



	ftrace_free_mem(start, end);

}



void __init ftrace_init(void)

{

	extern unsigned long __start_mcount_loc[];