linux-kernel - [PATCH 2/4] trace: let filter_assign_type() detect FILTER_PTR

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Message-Id: <20190525165802.25944-3-xiyou.wangcong@gmail.com>
Date:   Sat, 25 May 2019 09:58:00 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 2/4] trace: let filter_assign_type() detect FILTER_PTR_STRING

filter_assign_type() could detect dynamic string and static
string, but not string pointers. Teach filter_assign_type()
to detect string pointers, and this will be needed by trace
event injection code.

BTW, trace event hist uses FILTER_PTR_STRING too.

Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 kernel/trace/trace_events_filter.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index d3e59312ef40..550e8a0d048a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1080,6 +1080,9 @@ int filter_assign_type(const char *type)
 	if (strchr(type, '[') && strstr(type, "char"))
 		return FILTER_STATIC_STRING;
 
+	if (strcmp(type, "char *") == 0 || strcmp(type, "const char *") == 0)
+		return FILTER_PTR_STRING;
+
 	return FILTER_OTHER;
 }
 
-- 
2.21.0