linux-kernel - [for-next][PATCH 06/13] NFSD: Fix nfsd_clid_class use of __string

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Message-ID: <20240223141902.394601874@goodmis.org>
Date: Fri, 23 Feb 2024 09:18:44 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Jeff Layton <jlayton@...nel.org>,
 Neil Brown <neilb@...e.de>,
 Olga Kornievskaia <kolga@...app.com>,
 Dai Ngo <Dai.Ngo@...cle.com>,
 Tom Talpey <tom@...pey.com>,
 Chuck Lever <chuck.lever@...cle.com>
Subject: [for-next][PATCH 06/13] NFSD: Fix nfsd_clid_class use of __string_len() macro

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

I'm working on restructuring the __string* macros so that it doesn't need
to recalculate the string twice. That is, it will save it off when
processing __string() and the __assign_str() will not need to do the work
again as it currently does.

Currently __string_len(item, src, len) doesn't actually use "src", but my
changes will require src to be correct as that is where the __assign_str()
will get its value from.

The event class nfsd_clid_class has:

  __string_len(name, name, clp->cl_name.len)

But the second "name" does not exist and causes my changes to fail to
build. That second parameter should be: clp->cl_name.data.

Link: https://lore.kernel.org/linux-trace-kernel/20240222122828.3d8d213c@gandalf.local.home

Cc: Jeff Layton <jlayton@...nel.org>
Cc: Neil Brown <neilb@...e.de>
Cc: Olga Kornievskaia <kolga@...app.com>
Cc: Dai Ngo <Dai.Ngo@...cle.com>
Cc: Tom Talpey <tom@...pey.com>
Fixes: d27b74a8675ca ("NFSD: Use new __string_len C macros for nfsd_clid_class")
Acked-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 fs/nfsd/trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index d1e8cf079b0f..2cd57033791f 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -843,7 +843,7 @@ DECLARE_EVENT_CLASS(nfsd_clid_class,
 		__array(unsigned char, addr, sizeof(struct sockaddr_in6))
 		__field(unsigned long, flavor)
 		__array(unsigned char, verifier, NFS4_VERIFIER_SIZE)
-		__string_len(name, name, clp->cl_name.len)
+		__string_len(name, clp->cl_name.data, clp->cl_name.len)
 	),
 	TP_fast_assign(
 		__entry->cl_boot = clp->cl_clientid.cl_boot;
-- 
2.43.0