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Subject[for-next][PATCH 13/16] ftrace: Allow module init functions to be traced
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Allow for module init sections to be traced as well as core kernel init
sections. Now that filtering modules functions can be stored, for when they
are loaded, it makes sense to be able to trace them.

Cc: Jessica Yu <jeyu@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
include/linux/init.h | 4 +---
kernel/module.c | 2 ++
kernel/trace/ftrace.c | 6 ++++--
3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 94769d687cf0..a779c1816437 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -39,7 +39,7 @@

/* These are for everybody (although not all archs will actually
discard it in modules) */
-#define __init __section(.init.text) __cold __inittrace __latent_entropy
+#define __init __section(.init.text) __cold __latent_entropy
#define __initdata __section(.init.data)
#define __initconst __section(.init.rodata)
#define __exitdata __section(.exit.data)
@@ -68,10 +68,8 @@

#ifdef MODULE
#define __exitused
-#define __inittrace notrace
#else
#define __exitused __used
-#define __inittrace
#endif

#define __exit __section(.exit.text) __exitused __cold notrace
diff --git a/kernel/module.c b/kernel/module.c
index de66ec825992..58bca427ac3f 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3473,6 +3473,8 @@ static noinline int do_init_module(struct module *mod)
if (!mod->async_probe_requested && (current->flags & PF_USED_ASYNC))
async_synchronize_full();

+ ftrace_free_mem(mod->init_layout.base, mod->init_layout.base +
+ mod->init_layout.size);
mutex_lock(&module_mutex);
/* Drop initial reference. */
module_put(mod);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 84cb5928665a..d7297e866e4a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5752,7 +5752,8 @@ void ftrace_release_mod(struct module *mod)
last_pg = &ftrace_pages_start;
for (pg = ftrace_pages_start; pg; pg = *last_pg) {
rec = &pg->records[0];
- if (within_module_core(rec->ip, mod)) {
+ if (within_module_core(rec->ip, mod) ||
+ within_module_init(rec->ip, mod)) {
/*
* As core pages are first, the first
* page should never be a module page.
@@ -5821,7 +5822,8 @@ void ftrace_module_enable(struct module *mod)
* not part of this module, then skip this pg,
* which the "break" will do.
*/
- if (!within_module_core(rec->ip, mod))
+ if (!within_module_core(rec->ip, mod) &&
+ !within_module_init(rec->ip, mod))
break;

cnt = 0;
--
2.13.2

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