From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Namhyung Kim <namhyung@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Tom Zanussi <zanussi@kernel.org>,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>,
"Joel Fernandes (Google)" <joel@joelfernandes.org>
Subject: [for-next][PATCH 07/30] ftrace: Create new ftrace_internal.h header
Date: Wed, 05 Dec 2018 18:47:56 -0500 [thread overview]
Message-ID: <20181205234829.443473064@goodmis.org> (raw)
In-Reply-To: 20181205234749.372720574@goodmis.org
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
In order to move function graph infrastructure into its own file (fgraph.h)
it needs to access various functions and variables in ftrace.c that are
currently static. Create a new file called ftrace-internal.h that holds the
function prototypes and the extern declarations of the variables needed by
fgraph.c as well, and make them global in ftrace.c such that they can be
used outside that file.
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/ftrace.c | 76 +++++++---------------------------
kernel/trace/ftrace_internal.h | 75 +++++++++++++++++++++++++++++++++
2 files changed, 89 insertions(+), 62 deletions(-)
create mode 100644 kernel/trace/ftrace_internal.h
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 77734451cb05..52c89428b0db 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -40,6 +40,7 @@
#include <asm/sections.h>
#include <asm/setup.h>
+#include "ftrace_internal.h"
#include "trace_output.h"
#include "trace_stat.h"
@@ -77,7 +78,7 @@
#define ASSIGN_OPS_HASH(opsname, val)
#endif
-static struct ftrace_ops ftrace_list_end __read_mostly = {
+struct ftrace_ops ftrace_list_end __read_mostly = {
.func = ftrace_stub,
.flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_STUB,
INIT_OPS_HASH(ftrace_list_end)
@@ -112,11 +113,11 @@ static void ftrace_update_trampoline(struct ftrace_ops *ops);
*/
static int ftrace_disabled __read_mostly;
-static DEFINE_MUTEX(ftrace_lock);
+DEFINE_MUTEX(ftrace_lock);
-static struct ftrace_ops __rcu *ftrace_ops_list __read_mostly = &ftrace_list_end;
+struct ftrace_ops __rcu *ftrace_ops_list __read_mostly = &ftrace_list_end;
ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
-static struct ftrace_ops global_ops;
+struct ftrace_ops global_ops;
#if ARCH_SUPPORTS_FTRACE_OPS
static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
@@ -127,26 +128,6 @@ static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip);
#define ftrace_ops_list_func ((ftrace_func_t)ftrace_ops_no_ops)
#endif
-/*
- * Traverse the ftrace_global_list, invoking all entries. The reason that we
- * can use rcu_dereference_raw_notrace() is that elements removed from this list
- * are simply leaked, so there is no need to interact with a grace-period
- * mechanism. The rcu_dereference_raw_notrace() calls are needed to handle
- * concurrent insertions into the ftrace_global_list.
- *
- * Silly Alpha and silly pointer-speculation compiler optimizations!
- */
-#define do_for_each_ftrace_op(op, list) \
- op = rcu_dereference_raw_notrace(list); \
- do
-
-/*
- * Optimized for just a single item in the list (as that is the normal case).
- */
-#define while_for_each_ftrace_op(op) \
- while (likely(op = rcu_dereference_raw_notrace((op)->next)) && \
- unlikely((op) != &ftrace_list_end))
-
static inline void ftrace_ops_init(struct ftrace_ops *ops)
{
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -187,17 +168,11 @@ static void ftrace_sync_ipi(void *data)
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static void update_function_graph_func(void);
-
/* Both enabled by default (can be cleared by function_graph tracer flags */
static bool fgraph_sleep_time = true;
static bool fgraph_graph_time = true;
-
-#else
-static inline void update_function_graph_func(void) { }
#endif
-
static ftrace_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
{
/*
@@ -334,7 +309,7 @@ static int remove_ftrace_ops(struct ftrace_ops __rcu **list,
static void ftrace_update_trampoline(struct ftrace_ops *ops);
-static int __register_ftrace_function(struct ftrace_ops *ops)
+int __register_ftrace_function(struct ftrace_ops *ops)
{
if (ops->flags & FTRACE_OPS_FL_DELETED)
return -EINVAL;
@@ -375,7 +350,7 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
return 0;
}
-static int __unregister_ftrace_function(struct ftrace_ops *ops)
+int __unregister_ftrace_function(struct ftrace_ops *ops)
{
int ret;
@@ -1022,9 +997,7 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer)
#endif /* CONFIG_FUNCTION_PROFILER */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-static int ftrace_graph_active;
-#else
-# define ftrace_graph_active 0
+int ftrace_graph_active;
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -1067,7 +1040,7 @@ static const struct ftrace_hash empty_hash = {
};
#define EMPTY_HASH ((struct ftrace_hash *)&empty_hash)
-static struct ftrace_ops global_ops = {
+struct ftrace_ops global_ops = {
.func = ftrace_stub,
.local_hash.notrace_hash = EMPTY_HASH,
.local_hash.filter_hash = EMPTY_HASH,
@@ -1503,7 +1476,7 @@ static bool hash_contains_ip(unsigned long ip,
* This needs to be called with preemption disabled as
* the hashes are freed with call_rcu_sched().
*/
-static int
+int
ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
{
struct ftrace_ops_hash hash;
@@ -2682,7 +2655,7 @@ static void ftrace_startup_all(int command)
update_all_ops = false;
}
-static int ftrace_startup(struct ftrace_ops *ops, int command)
+int ftrace_startup(struct ftrace_ops *ops, int command)
{
int ret;
@@ -2724,7 +2697,7 @@ static int ftrace_startup(struct ftrace_ops *ops, int command)
return 0;
}
-static int ftrace_shutdown(struct ftrace_ops *ops, int command)
+int ftrace_shutdown(struct ftrace_ops *ops, int command)
{
int ret;
@@ -6177,7 +6150,7 @@ void ftrace_init_trace_array(struct trace_array *tr)
}
#else
-static struct ftrace_ops global_ops = {
+struct ftrace_ops global_ops = {
.func = ftrace_stub,
.flags = FTRACE_OPS_FL_RECURSION_SAFE |
FTRACE_OPS_FL_INITIALIZED |
@@ -6194,31 +6167,10 @@ core_initcall(ftrace_nodyn_init);
static inline int ftrace_init_dyn_tracefs(struct dentry *d_tracer) { return 0; }
static inline void ftrace_startup_enable(int command) { }
static inline void ftrace_startup_all(int command) { }
-/* Keep as macros so we do not need to define the commands */
-# define ftrace_startup(ops, command) \
- ({ \
- int ___ret = __register_ftrace_function(ops); \
- if (!___ret) \
- (ops)->flags |= FTRACE_OPS_FL_ENABLED; \
- ___ret; \
- })
-# define ftrace_shutdown(ops, command) \
- ({ \
- int ___ret = __unregister_ftrace_function(ops); \
- if (!___ret) \
- (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
- ___ret; \
- })
# define ftrace_startup_sysctl() do { } while (0)
# define ftrace_shutdown_sysctl() do { } while (0)
-static inline int
-ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
-{
- return 1;
-}
-
static void ftrace_update_trampoline(struct ftrace_ops *ops)
{
}
@@ -6930,7 +6882,7 @@ static int ftrace_graph_entry_test(struct ftrace_graph_ent *trace)
* function against the global ops, and not just trace any function
* that any ftrace_ops registered.
*/
-static void update_function_graph_func(void)
+void update_function_graph_func(void)
{
struct ftrace_ops *op;
bool do_test = false;
diff --git a/kernel/trace/ftrace_internal.h b/kernel/trace/ftrace_internal.h
new file mode 100644
index 000000000000..0515a2096f90
--- /dev/null
+++ b/kernel/trace/ftrace_internal.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
+#define _LINUX_KERNEL_FTRACE_INTERNAL_H
+
+#ifdef CONFIG_FUNCTION_TRACER
+
+/*
+ * Traverse the ftrace_global_list, invoking all entries. The reason that we
+ * can use rcu_dereference_raw_notrace() is that elements removed from this list
+ * are simply leaked, so there is no need to interact with a grace-period
+ * mechanism. The rcu_dereference_raw_notrace() calls are needed to handle
+ * concurrent insertions into the ftrace_global_list.
+ *
+ * Silly Alpha and silly pointer-speculation compiler optimizations!
+ */
+#define do_for_each_ftrace_op(op, list) \
+ op = rcu_dereference_raw_notrace(list); \
+ do
+
+/*
+ * Optimized for just a single item in the list (as that is the normal case).
+ */
+#define while_for_each_ftrace_op(op) \
+ while (likely(op = rcu_dereference_raw_notrace((op)->next)) && \
+ unlikely((op) != &ftrace_list_end))
+
+extern struct ftrace_ops __rcu *ftrace_ops_list;
+extern struct ftrace_ops ftrace_list_end;
+extern struct mutex ftrace_lock;
+extern struct ftrace_ops global_ops;
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+
+int ftrace_startup(struct ftrace_ops *ops, int command);
+int ftrace_shutdown(struct ftrace_ops *ops, int command);
+int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
+
+#else /* !CONFIG_DYNAMIC_FTRACE */
+
+int __register_ftrace_function(struct ftrace_ops *ops);
+int __unregister_ftrace_function(struct ftrace_ops *ops);
+/* Keep as macros so we do not need to define the commands */
+# define ftrace_startup(ops, command) \
+ ({ \
+ int ___ret = __register_ftrace_function(ops); \
+ if (!___ret) \
+ (ops)->flags |= FTRACE_OPS_FL_ENABLED; \
+ ___ret; \
+ })
+# define ftrace_shutdown(ops, command) \
+ ({ \
+ int ___ret = __unregister_ftrace_function(ops); \
+ if (!___ret) \
+ (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \
+ ___ret; \
+ })
+static inline int
+ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
+{
+ return 1;
+}
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+extern int ftrace_graph_active;
+void update_function_graph_func(void);
+#else /* !CONFIG_FUNCTION_GRAPH_TRACER */
+# define ftrace_graph_active 0
+static inline void update_function_graph_func(void) { }
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+#else /* !CONFIG_FUNCTION_TRACER */
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#endif
--
2.19.1
next prev parent reply other threads:[~2018-12-05 23:50 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 23:47 [for-next][PATCH 00/30] tracing: Updates for the next merge window Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 01/30] function_graph: Remove unused task_curr_ret_stack() Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 02/30] tracing: Do not line wrap short line in function_graph_enter() Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 03/30] fgraph: Create a fgraph.c file to store function graph infrastructure Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 04/30] fgraph: Have set_graph_notrace only affect function_graph tracer Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 05/30] arm64: function_graph: Remove use of FTRACE_NOTRACE_DEPTH Steven Rostedt
2018-12-06 3:55 ` Steven Rostedt
2018-12-06 15:49 ` Will Deacon
2018-12-06 15:55 ` Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 06/30] function_graph: Remove the " Steven Rostedt
2018-12-05 23:47 ` Steven Rostedt [this message]
2018-12-05 23:47 ` [for-next][PATCH 08/30] function_graph: Do not expose the graph_time option when profiler is not configured Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 09/30] fgraph: Move function graph specific code into fgraph.c Steven Rostedt
2018-12-05 23:47 ` [for-next][PATCH 10/30] tracing: Rearrange functions in trace_sched_wakeup.c Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 11/30] fgraph: Add new fgraph_ops structure to enable function graph hooks Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 12/30] function_graph: Move ftrace_graph_ret_addr() to fgraph.c Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 13/30] function_graph: Have profiler use new helper ftrace_graph_get_ret_stack() Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 14/30] tracing: Have trace_stack nr_entries compare not be so subtle Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 15/30] scripts/recordmcount.{c,pl}: support -ffunction-sections .text.* section names Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 16/30] ring-buffer: Add percentage of ring buffer full to wake up reader Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 17/30] tracing: Add tracefs file buffer_percentage Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 18/30] tracing: Change default buffer_percent to 50 Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 19/30] tracing/uprobes: Add busy check when cleanup all uprobes Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 20/30] tracing: Lock event_mutex before synth_event_mutex Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 21/30] tracing: Simplify creation and deletion of synthetic events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 22/30] tracing: Integrate similar probe argument parsers Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 23/30] tracing: Add unified dynamic event framework Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 24/30] tracing/kprobes: Use dyn_event framework for kprobe events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 25/30] tracing/uprobes: Use dyn_event framework for uprobe events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 26/30] tracing: Use dyn_event framework for synthetic events Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 27/30] tracing: Remove unneeded synth_event_mutex Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 28/30] tracing: Consolidate trace_add/remove_event_call back to the nolock functions Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 29/30] tracing: Add generic event-name based remove event method Steven Rostedt
2018-12-05 23:48 ` [for-next][PATCH 30/30] selftests/ftrace: Add testcases for dynamic event Steven Rostedt
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