Messages in this thread Patch in this message |  | | | Date | Fri, 09 Oct 2009 16:08:41 -0700 | | From | Greg KH <> | | Subject | [patch 05/26] tracing: correct module boundaries for ftrace_release |
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2.6.31-stable review patch. If anyone has any objections, please let us know.
------------------ From: jolsa@redhat.com <jolsa@redhat.com> commit e7247a15ff3bbdab0a8b402dffa1171e5c05a8e0 upstream.
When the module is about the unload we release its call records. The ftrace_release function was given wrong values representing the module core boundaries, thus not releasing its call records.
Plus making ftrace_release function module specific.
Signed-off-by: Jiri Olsa <jolsa@redhat.com> LKML-Reference: <1254934835-363-3-git-send-email-jolsa@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- include/linux/ftrace.h | 2 +- kernel/trace/ftrace.c | 12 ++++-------- 2 files changed, 5 insertions(+), 9 deletions(-) --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -241,7 +241,7 @@ extern void ftrace_enable_daemon(void); # define ftrace_set_filter(buf, len, reset) do { } while (0) # define ftrace_disable_daemon() do { } while (0) # define ftrace_enable_daemon() do { } while (0) -static inline void ftrace_release(void *start, unsigned long size) { } +static inline void ftrace_release_mod(struct module *mod) {} static inline int register_ftrace_command(struct ftrace_func_command *cmd) { return -EINVAL; --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2801,19 +2801,17 @@ static int ftrace_convert_nops(struct mo } #ifdef CONFIG_MODULES -void ftrace_release(void *start, void *end) +void ftrace_release_mod(struct module *mod) { struct dyn_ftrace *rec; struct ftrace_page *pg; - unsigned long s = (unsigned long)start; - unsigned long e = (unsigned long)end; - if (ftrace_disabled || !start || start == end) + if (ftrace_disabled) return; mutex_lock(&ftrace_lock); do_for_each_ftrace_rec(pg, rec) { - if ((rec->ip >= s) && (rec->ip < e)) { + if (within_module_core(rec->ip, mod)) { /* * rec->ip is changed in ftrace_free_rec() * It should not between s and e if record was freed. @@ -2845,9 +2843,7 @@ static int ftrace_module_notify(struct n mod->num_ftrace_callsites); break; case MODULE_STATE_GOING: - ftrace_release(mod->ftrace_callsites, - mod->ftrace_callsites + - mod->num_ftrace_callsites); + ftrace_release_mod(mod); break; }
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