linux-kernel - [PATCH 05/22] lib/traceevent: Allow expressions in __print

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Date:	Wed, 23 May 2012 11:36:42 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>
Subject: [PATCH 05/22] lib/traceevent: Allow expressions in __print_symbolic() fields

From: Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>

The __print_symbolic() function takes a sequence of key-value pairs for
pretty-printing a constant.  The new kvm:kvm_exit print fmt uses the
expression:

  __print_symbolic(..., { 0x040 + 1, "DB excp" }, ...)

Currently only atoms are supported and this print fmt fails to parse.
This patch adds support for expressions instead of just atoms so that
0x040 + 1 is parsed successfully.

Link: http://lkml.kernel.org/r/1315131959-7452-1-git-send-email-stefanha@linux.vnet.ibm.com

Signed-off-by: Stefan Hajnoczi <stefanha@...ux.vnet.ibm.com>
Cc: Avi Kivity <avi@...hat.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Namhyung Kim <namhyung.kim@....com>
---
 tools/lib/traceevent/event-parse.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 9216aef78394..59534e299590 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -2124,6 +2124,13 @@ process_fields(struct event_format *event, struct print_flag_sym **list, char **
 
 		free_token(token);
 		type = process_arg(event, arg, &token);
+
+		if (type == EVENT_OP)
+			type = process_op(event, arg, &token);
+
+		if (type == EVENT_ERROR)
+			goto out_free;
+
 		if (test_type_token(type, token, EVENT_DELIM, ","))
 			goto out_free;
 
-- 
1.7.10.1

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