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ftrace: Allow module init functions to be traced

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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>
This commit is contained in:
Steven Rostedt (VMware) 2017-03-03 18:00:22 -05:00
parent 6cafbe1594
commit 3e234289f8
3 changed files with 7 additions and 5 deletions
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4
include/linux/init.h
View File

@ -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

2
kernel/module.c
View File

@ -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);

6
kernel/trace/ftrace.c
View File

@ -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;