mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

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: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-06-20 10:44:58 -04:00
parent 5819eaddf3
commit 6cafbe1594
2 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/ftrace.h
View File

@ -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
/*

14
kernel/trace/ftrace.c
View File

@ -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[];