linux-kernel - Re: [PATCH v3] tracepoint: add new `tcp:tcp_ca

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Message-ID: <a587dac9e02cfde669743fd54ab41a3c6014c5e9.camel@perches.com>
Date:   Sat, 12 Aug 2023 19:08:20 -0700
From:   Joe Perches <joe@...ches.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Zheao Li <me@...jusaka.me>, edumazet@...gle.com,
        bpf@...r.kernel.org, davem@...emloft.net, dsahern@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, mhiramat@...nel.org,
        ncardwell@...gle.com, netdev@...r.kernel.org, pabeni@...hat.com
Subject: Re: [PATCH v3] tracepoint: add new `tcp:tcp_ca_event` trace event

On Sat, 2023-08-12 at 21:53 -0400, Steven Rostedt wrote:
> On Sat, 12 Aug 2023 18:17:17 -0700
> Joe Perches <joe@...ches.com> wrote:
> 
> > > I forgot to say "for TRACE_EVENT() macros". This is not about what
> > > checkpatch says about other code.  
> > 
> > trace has its own code style and checkpatch needs another
> > parsing mechanism just for it, including the alignment to
> > open parenthesis test.
> 
> If you have a template patch to add the parsing mechanism, I'd be happy
> to try to fill in the style.

There is no checkpatch mechanism per se.  It's all ad-hoc.

Perhaps something like this though would work well enough
as it just avoids all the other spacing checks and such.
---
 scripts/checkpatch.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 528f619520eb9..3017f4dd09fd2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3947,6 +3947,9 @@ sub process {
 			}
 		}
 
+# trace include files use a completely different grammar
+		next if ($realfile =~ m{(?:include/trace/events/|/trace\.h$/)});
+
 # check multi-line statement indentation matches previous line
 		if ($perl_version_ok &&
 		    $prevline =~ /^\+([ \t]*)((?:$c90_Keywords(?:\s+if)\s*)|(?:$Declare\s*)?(?:$Ident|\(\s*\*\s*$Ident\s*\))\s*|(?:\*\s*)*$Lval\s*=\s*$Ident\s*)\(.*(\&\&|\|\||,)\s*$/) {