netdev - Re: [PATCH] tracing/treewide: Remove second parameter of __assign

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Message-ID: <20240517162312.GZ360919@frogsfrogsfrogs>
Date: Fri, 17 May 2024 09:23:12 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Linux trace kernel <linux-trace-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org,
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	tipc-discussion@...ts.sourceforge.net,
	Julia Lawall <Julia.Lawall@...ia.fr>
Subject: Re: [PATCH] tracing/treewide: Remove second parameter of
 __assign_str()

On Thu, May 16, 2024 at 01:34:54PM -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@...dmis.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@...nel.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Julia Lawall <Julia.Lawall@...ia.fr>
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>

/me finds this pretty magical, but such is the way of macros.
Thanks for being much smarter about them than me. :)

Acked-by: Darrick J. Wong <djwong@...nel.org>	# xfs

--D