linux-kernel - [PATCH v1 3/3] tracing: Use generic type for comparator function

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Date:   Mon,  7 Oct 2019 16:56:56 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        George Spelvin <lkml@....org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 3/3] tracing: Use generic type for comparator function

Comparator function type, cmp_func_t, is defined in the types.h,
use it in the code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 kernel/trace/ftrace.c       | 12 ++++++------
 kernel/trace/trace_branch.c |  8 ++++----
 kernel/trace/trace_stat.c   |  6 ++----
 kernel/trace/trace_stat.h   |  2 +-
 4 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 62a50bf399d6..3bf9e805c46c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -462,10 +462,10 @@ static void *function_stat_start(struct tracer_stat *trace)
 
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 /* function graph compares on total time */
-static int function_stat_cmp(void *p1, void *p2)
+static int function_stat_cmp(const void *p1, const void *p2)
 {
-	struct ftrace_profile *a = p1;
-	struct ftrace_profile *b = p2;
+	const struct ftrace_profile *a = p1;
+	const struct ftrace_profile *b = p2;
 
 	if (a->time < b->time)
 		return -1;
@@ -476,10 +476,10 @@ static int function_stat_cmp(void *p1, void *p2)
 }
 #else
 /* not function graph compares against hits */
-static int function_stat_cmp(void *p1, void *p2)
+static int function_stat_cmp(const void *p1, const void *p2)
 {
-	struct ftrace_profile *a = p1;
-	struct ftrace_profile *b = p2;
+	const struct ftrace_profile *a = p1;
+	const struct ftrace_profile *b = p2;
 
 	if (a->counter < b->counter)
 		return -1;
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 3ea65cdff30d..88e158d27965 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -244,7 +244,7 @@ static int annotated_branch_stat_headers(struct seq_file *m)
 	return 0;
 }
 
-static inline long get_incorrect_percent(struct ftrace_branch_data *p)
+static inline long get_incorrect_percent(const struct ftrace_branch_data *p)
 {
 	long percent;
 
@@ -332,10 +332,10 @@ annotated_branch_stat_next(void *v, int idx)
 	return p;
 }
 
-static int annotated_branch_stat_cmp(void *p1, void *p2)
+static int annotated_branch_stat_cmp(const void *p1, const void *p2)
 {
-	struct ftrace_branch_data *a = p1;
-	struct ftrace_branch_data *b = p2;
+	const struct ftrace_branch_data *a = p1;
+	const struct ftrace_branch_data *b = p2;
 
 	long percent_a, percent_b;
 
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 75bf1bcb4a8a..dd9960a2dd0c 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -72,9 +72,7 @@ static void destroy_session(struct stat_session *session)
 	kfree(session);
 }
 
-typedef int (*cmp_stat_t)(void *, void *);
-
-static int insert_stat(struct rb_root *root, void *stat, cmp_stat_t cmp)
+static int insert_stat(struct rb_root *root, void *stat, cmp_func_t cmp)
 {
 	struct rb_node **new = &(root->rb_node), *parent = NULL;
 	struct stat_node *data;
@@ -112,7 +110,7 @@ static int insert_stat(struct rb_root *root, void *stat, cmp_stat_t cmp)
  * This one will force an insertion as right-most node
  * in the rbtree.
  */
-static int dummy_cmp(void *p1, void *p2)
+static int dummy_cmp(const void *p1, const void *p2)
 {
 	return -1;
 }
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
index 8786d17caf49..31d7dc5bf1db 100644
--- a/kernel/trace/trace_stat.h
+++ b/kernel/trace/trace_stat.h
@@ -16,7 +16,7 @@ struct tracer_stat {
 	void			*(*stat_start)(struct tracer_stat *trace);
 	void			*(*stat_next)(void *prev, int idx);
 	/* Compare two entries for stats sorting */
-	int			(*stat_cmp)(void *p1, void *p2);
+	cmp_func_t		stat_cmp;
 	/* Print a stat entry */
 	int			(*stat_show)(struct seq_file *s, void *p);
 	/* Release an entry */
-- 
2.23.0