ftrace: Cleanup of global variables ftrace_new_pgs and ftrace_update_cnt

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

Link: http://lkml.kernel.org/r/1393268401-24379-1-git-send-email-jslaby@suse.cz

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files 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;