linux-kernel - [PATCH 12/16] ftrace: Decouple hash items from showing filtered functions

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Date:	Wed, 21 Dec 2011 07:36:36 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 12/16] ftrace: Decouple hash items from showing filtered functions

From: Steven Rostedt <srostedt@...hat.com>

The set_ftrace_filter shows "hashed" functions, which are functions
that are added with operations to them (like traceon and traceoff).

As other subsystems may be able to show what functions they are
using for function tracing, the hash items should no longer
be shown just because the FILTER flag is set. As they have nothing
to do with other subsystems filters.

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 include/linux/ftrace.h |    5 +++--
 kernel/trace/ftrace.c  |   16 ++++++++--------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index aa7559f..d1ff0de 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -206,8 +206,9 @@ enum {
 	FTRACE_ITER_FILTER	= (1 << 0),
 	FTRACE_ITER_NOTRACE	= (1 << 1),
 	FTRACE_ITER_PRINTALL	= (1 << 2),
-	FTRACE_ITER_HASH	= (1 << 3),
-	FTRACE_ITER_ENABLED	= (1 << 4),
+	FTRACE_ITER_DO_HASH	= (1 << 3),
+	FTRACE_ITER_HASH	= (1 << 4),
+	FTRACE_ITER_ENABLED	= (1 << 5),
 };
 
 void arch_ftrace_update_code(int command);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 5b105c5..5728d9a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2198,6 +2198,9 @@ static void *t_hash_start(struct seq_file *m, loff_t *pos)
 	void *p = NULL;
 	loff_t l;
 
+	if (!(iter->flags & FTRACE_ITER_DO_HASH))
+		return NULL;
+
 	if (iter->func_pos > *pos)
 		return NULL;
 
@@ -2343,12 +2346,8 @@ static void *t_start(struct seq_file *m, loff_t *pos)
 			break;
 	}
 
-	if (!p) {
-		if (iter->flags & FTRACE_ITER_FILTER)
-			return t_hash_start(m, pos);
-
-		return NULL;
-	}
+	if (!p)
+		return t_hash_start(m, pos);
 
 	return iter;
 }
@@ -2541,8 +2540,9 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
 static int
 ftrace_filter_open(struct inode *inode, struct file *file)
 {
-	return ftrace_regex_open(&global_ops, FTRACE_ITER_FILTER,
-				 inode, file);
+	return ftrace_regex_open(&global_ops,
+			FTRACE_ITER_FILTER | FTRACE_ITER_DO_HASH,
+			inode, file);
 }
 
 static int
-- 
1.7.7.3



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