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Date: Mon, 24 Feb 2014 19:59:56 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: rostedt@...dmis.org
Cc: jirislaby@...il.com, linux-kernel@...r.kernel.org,
Jiri Slaby <jslaby@...e.cz>,
Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...hat.com>
Subject: [PATCH v2 1/6] ftrace: Cleanup of global variables
Some of them can be local to functions, so make them local and pass
them as parameters where needed:
* __start_mcount_loc+__stop_mcount_loc are local to ftrace_init
* ftrace_new_pgs -> new_pgs/start_pg
* ftrace_update_cnt -> local update_cnt in ftrace_update_code
[v2]
- leave time stamps alone for now
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
kernel/trace/ftrace.c | 25 ++++++++-----------------
1 file changed, 8 insertions(+), 17 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 5313c1100d30..3f95bbeb8e8d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1174,8 +1174,6 @@ struct ftrace_page {
int size;
};
-static struct ftrace_page *ftrace_new_pgs;
-
#define ENTRY_SIZE sizeof(struct dyn_ftrace)
#define ENTRIES_PER_PAGE (PAGE_SIZE / ENTRY_SIZE)
@@ -2246,7 +2244,6 @@ static void ftrace_shutdown_sysctl(void)
}
static cycle_t ftrace_update_time;
-static unsigned long ftrace_update_cnt;
unsigned long ftrace_update_tot_cnt;
static inline int ops_traces_mod(struct ftrace_ops *ops)
@@ -2302,11 +2299,12 @@ static int referenced_filters(struct dyn_ftrace *rec)
return cnt;
}
-static int ftrace_update_code(struct module *mod)
+static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
{
struct ftrace_page *pg;
struct dyn_ftrace *p;
cycle_t start, stop;
+ unsigned long update_cnt = 0;
unsigned long ref = 0;
bool test = false;
int i;
@@ -2332,9 +2330,8 @@ static int ftrace_update_code(struct module *mod)
}
start = ftrace_now(raw_smp_processor_id());
- ftrace_update_cnt = 0;
- for (pg = ftrace_new_pgs; pg; pg = pg->next) {
+ for (pg = new_pgs; pg; pg = pg->next) {
for (i = 0; i < pg->index; i++) {
int cnt = ref;
@@ -2355,7 +2352,7 @@ static int ftrace_update_code(struct module *mod)
if (!ftrace_code_disable(mod, p))
break;
- ftrace_update_cnt++;
+ update_cnt++;
/*
* If the tracing is enabled, go ahead and enable the record.
@@ -2374,11 +2371,9 @@ static int ftrace_update_code(struct module *mod)
}
}
- ftrace_new_pgs = NULL;
-
stop = ftrace_now(raw_smp_processor_id());
ftrace_update_time = stop - start;
- ftrace_update_tot_cnt += ftrace_update_cnt;
+ ftrace_update_tot_cnt += update_cnt;
return 0;
}
@@ -4270,9 +4265,6 @@ static int ftrace_process_locs(struct module *mod,
/* Assign the last page to ftrace_pages */
ftrace_pages = pg;
- /* These new locations need to be initialized */
- ftrace_new_pgs = start_pg;
-
/*
* We only need to disable interrupts on start up
* because we are modifying code that an interrupt
@@ -4283,7 +4275,7 @@ static int ftrace_process_locs(struct module *mod,
*/
if (!mod)
local_irq_save(flags);
- ftrace_update_code(mod);
+ ftrace_update_code(mod, start_pg);
if (!mod)
local_irq_restore(flags);
ret = 0;
@@ -4392,11 +4384,10 @@ struct notifier_block ftrace_module_exit_nb = {
.priority = INT_MIN, /* Run after anything that can remove kprobes */
};
-extern unsigned long __start_mcount_loc[];
-extern unsigned long __stop_mcount_loc[];
-
void __init ftrace_init(void)
{
+ extern unsigned long __start_mcount_loc[];
+ extern unsigned long __stop_mcount_loc[];
unsigned long count, addr, flags;
int ret;
--
1.8.5.2
--
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