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Some more tracing fixes for 6.3:

Browse Source 
- Reset direct->addr back to its original value on error in updating
   the direct trampoline code.
 
 - Make lastcmd_mutex static.
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Merge tag 'trace-v6.3-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing fixes from Steven Rostedt:
 "A couple more minor fixes:

   - Reset direct->addr back to its original value on error in updating
     the direct trampoline code

   - Make lastcmd_mutex static"

* tag 'trace-v6.3-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing/synthetic: Make lastcmd_mutex static
  ftrace: Fix issue that 'direct->addr' not restored in modify_ftrace_direct()
This commit is contained in:
Linus Torvalds 2023-04-08 11:02:03 -07:00
commit 1a8a804a4f
2 changed files with 10 additions and 7 deletions
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15
kernel/trace/ftrace.c
View File

@ -5667,12 +5667,15 @@ int modify_ftrace_direct(unsigned long ip,
ret = 0;
}
if (unlikely(ret && new_direct)) {
direct->count++;
list_del_rcu(&new_direct->next);
synchronize_rcu_tasks();
kfree(new_direct);
ftrace_direct_func_count--;
if (ret) {
direct->addr = old_addr;
if (unlikely(new_direct)) {
direct->count++;
list_del_rcu(&new_direct->next);
synchronize_rcu_tasks();
kfree(new_direct);
ftrace_direct_func_count--;
}
}
out_unlock:

2
kernel/trace/trace_events_synth.c
View File

@ -44,7 +44,7 @@ enum { ERRORS };
static const char *err_text[] = { ERRORS };
DEFINE_MUTEX(lastcmd_mutex);
static DEFINE_MUTEX(lastcmd_mutex);
static char *last_cmd;
static int errpos(const char *str)