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From:   Jim Cromie <jim.cromie@gmail.com>
To:     Jason Baron <jbaron@akamai.com>, linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, Jim Cromie <jim.cromie@gmail.com>
Subject: [RFC PATCH v5 10/28] dyndbg: accept null site in ddebug_proc_show
Date:   Tue, 11 May 2021 12:50:39 -0600
Message-Id: <20210511185057.3815777-11-jim.cromie@gmail.com>
In-Reply-To: <20210511185057.3815777-1-jim.cromie@gmail.com>
References: <20210511185057.3815777-1-jim.cromie@gmail.com>
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Accept a ddebug record with a null site pointer, and write abbreviated
output for that record that doesn't include site info (but does
include line-number, since that can be used in >control queries).
Also add a 2nd header line with a template for the new output.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
 lib/dynamic_debug.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index fb8547feb061..5faf49054b1d 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -923,18 +923,27 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
 
 	if (p == SEQ_START_TOKEN) {
 		seq_puts(m,
-			 "# filename:lineno [module]function flags format\n");
+			 "#: filename:lineno [module]function flags format\n"
+			 "#| [module]:lineno flags format\n"
+			);
 		return 0;
 	}
 
 	dc = dp->site;
-
-	seq_printf(m, "%s:%u [%s]%s =%s \"",
-		   trim_prefix(dc->filename), dp->lineno,
-		   iter->table->mod_name, dc->function,
-		   ddebug_describe_flags(dp->flags, &flags));
-	seq_escape(m, dp->format, "\t\r\n\"");
-	seq_puts(m, "\"\n");
+	if (dc) {
+		seq_printf(m, "%s:%u [%s]%s =%s \"",
+			   trim_prefix(dc->filename), dp->lineno,
+			   iter->table->mod_name, dc->function,
+			   ddebug_describe_flags(dp->flags, &flags));
+		seq_escape(m, dp->format, "\t\r\n\"");
+		seq_puts(m, "\"\n");
+	} else {
+		seq_printf(m, "[%s]:%u =%s \"",
+			   iter->table->mod_name, dp->lineno,
+			   ddebug_describe_flags(dp->flags, &flags));
+		seq_escape(m, dp->format, "\t\r\n\"");
+		seq_puts(m, "\"\n");
+	}
 
 	return 0;
 }
-- 
2.31.1