Re: [PATCH] tracing/treewide: Remove second parameter of __assign_str()

Rafael J. Wysocki
2024-05-17T09:38:39Z

On Thu, May 16, 2024 at 7:35 PM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> From: "Steven Rostedt (Google)" <rostedt@goodmis.org>
>
> [
> This is a treewide change. I will likely re-create this patch again in
> the second week of the merge window of v6.10 and submit it then. Hoping
> to keep the conflicts that it will cause to a minimum.
> ]
>
> With the rework of how the __string() handles dynamic strings where it
> saves off the source string in field in the helper structure[1], the
> assignment of that value to the trace event field is stored in the helper
> value and does not need to be passed in again.
>
> This means that with:
>
> __string(field, mystring)
>
> Which use to be assigned with __assign_str(field, mystring), no longer
> needs the second parameter and it is unused. With this, __assign_str()
> will now only get a single parameter.
>
> There's over 700 users of __assign_str() and because coccinelle does not
> handle the TRACE_EVENT() macro I ended up using the following sed script:
>
> git grep -l __assign_str | while read a ; do
> sed -e 's/\(__assign_str([^,]*[^ ,]\) *,[^;]*/\1)/' $a > /tmp/test-file;
> mv /tmp/test-file $a;
> done
>
> I then searched for __assign_str() that did not end with ';' as those
> were multi line assignments that the sed script above would fail to catch.
>
> Note, the same updates will need to be done for:
>
> __assign_str_len()
> __assign_rel_str()
> __assign_rel_str_len()
>
> I tested this with both an allmodconfig and an allyesconfig (build only for both).
>
> [1] https://lore.kernel.org/linux-trace-kernel/20240222211442.634192653@goodmis.org/
>
> Cc: Masami Hiramatsu <mhiramat@kernel.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Julia Lawall <Julia.Lawall@inria.fr>
> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Acked-by: Rafael J. Wysocki <rafael@kernel.org> # for thermal