linux-kernel - Re: [PATCH 1/2] tracing: Remove "__attribute_

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Message-ID: <20250710095327.69144489@batman.local.home>
Date: Thu, 10 Jul 2025 09:53:27 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tracing: Remove "__attribute__()" from the type
 field of event format

On Thu, 10 Jul 2025 22:45:20 +0900
Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:

> > And it doesn't free after allocation because it only does the
> > allocation for events that will never be freed. For modules, it
> > registers the allocated string so it will be freed on unload.  
> 
> What happen if the tracepoint in module has the __attribute__?
> (or enum etc?)

It adds the string to a linked list via add_str_to_module(). When the
module is unloaded, it searches the link list "module_strings" for all
the strings registered under that module and frees it.

See trace_module_remove_events().

-- Steve