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authorPeter Zijlstra <peterz@infradead.org>2017-10-11 10:45:32 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-10-17 01:13:38 +0300
commitb3a88803ac5b4bda26017b485c8722a8487fefb7 (patch)
tree542d5da25fe48163a8c000ca9a26f4defddfa1fa /kernel/trace
parent1dd311e6dcda4020c603bcf9f390a577d439d509 (diff)
downloadlinux-b3a88803ac5b4bda26017b485c8722a8487fefb7.tar.xz
ftrace: Kill FTRACE_OPS_FL_PER_CPU
The one and only user of FTRACE_OPS_FL_PER_CPU is gone, remove the lot. Link: http://lkml.kernel.org/r/20171011080224.372422809@infradead.org Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/ftrace.c55
1 files changed, 6 insertions, 49 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index e0a98225666b..2fd3edaec6de 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -203,30 +203,6 @@ void clear_ftrace_function(void)
ftrace_trace_function = ftrace_stub;
}
-static void per_cpu_ops_disable_all(struct ftrace_ops *ops)
-{
- int cpu;
-
- for_each_possible_cpu(cpu)
- *per_cpu_ptr(ops->disabled, cpu) = 1;
-}
-
-static int per_cpu_ops_alloc(struct ftrace_ops *ops)
-{
- int __percpu *disabled;
-
- if (WARN_ON_ONCE(!(ops->flags & FTRACE_OPS_FL_PER_CPU)))
- return -EINVAL;
-
- disabled = alloc_percpu(int);
- if (!disabled)
- return -ENOMEM;
-
- ops->disabled = disabled;
- per_cpu_ops_disable_all(ops);
- return 0;
-}
-
static void ftrace_sync(struct work_struct *work)
{
/*
@@ -262,8 +238,8 @@ static ftrace_func_t ftrace_ops_get_list_func(struct ftrace_ops *ops)
* If this is a dynamic, RCU, or per CPU ops, or we force list func,
* then it needs to call the list anyway.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU |
- FTRACE_OPS_FL_RCU) || FTRACE_FORCE_LIST_FUNC)
+ if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_RCU) ||
+ FTRACE_FORCE_LIST_FUNC)
return ftrace_ops_list_func;
return ftrace_ops_get_func(ops);
@@ -422,11 +398,6 @@ static int __register_ftrace_function(struct ftrace_ops *ops)
if (!core_kernel_data((unsigned long)ops))
ops->flags |= FTRACE_OPS_FL_DYNAMIC;
- if (ops->flags & FTRACE_OPS_FL_PER_CPU) {
- if (per_cpu_ops_alloc(ops))
- return -ENOMEM;
- }
-
add_ftrace_ops(&ftrace_ops_list, ops);
/* Always save the function, and reset at unregistering */
@@ -2727,11 +2698,6 @@ void __weak arch_ftrace_trampoline_free(struct ftrace_ops *ops)
{
}
-static void per_cpu_ops_free(struct ftrace_ops *ops)
-{
- free_percpu(ops->disabled);
-}
-
static void ftrace_startup_enable(int command)
{
if (saved_ftrace_func != ftrace_trace_function) {
@@ -2833,7 +2799,7 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
* not currently active, we can just free them
* without synchronizing all CPUs.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU))
+ if (ops->flags & FTRACE_OPS_FL_DYNAMIC)
goto free_ops;
return 0;
@@ -2880,7 +2846,7 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
* The same goes for freeing the per_cpu data of the per_cpu
* ops.
*/
- if (ops->flags & (FTRACE_OPS_FL_DYNAMIC | FTRACE_OPS_FL_PER_CPU)) {
+ if (ops->flags & FTRACE_OPS_FL_DYNAMIC) {
/*
* We need to do a hard force of sched synchronization.
* This is because we use preempt_disable() to do RCU, but
@@ -2903,9 +2869,6 @@ static int ftrace_shutdown(struct ftrace_ops *ops, int command)
free_ops:
arch_ftrace_trampoline_free(ops);
-
- if (ops->flags & FTRACE_OPS_FL_PER_CPU)
- per_cpu_ops_free(ops);
}
return 0;
@@ -6355,10 +6318,7 @@ __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
* If any of the above fails then the op->func() is not executed.
*/
if ((!(op->flags & FTRACE_OPS_FL_RCU) || rcu_is_watching()) &&
- (!(op->flags & FTRACE_OPS_FL_PER_CPU) ||
- !ftrace_function_local_disabled(op)) &&
ftrace_ops_test(op, ip, regs)) {
-
if (FTRACE_WARN_ON(!op->func)) {
pr_warn("op=%p %pS\n", op, op);
goto out;
@@ -6416,10 +6376,7 @@ static void ftrace_ops_assist_func(unsigned long ip, unsigned long parent_ip,
preempt_disable_notrace();
- if (!(op->flags & FTRACE_OPS_FL_PER_CPU) ||
- !ftrace_function_local_disabled(op)) {
- op->func(ip, parent_ip, op, regs);
- }
+ op->func(ip, parent_ip, op, regs);
preempt_enable_notrace();
trace_clear_recursion(bit);
@@ -6443,7 +6400,7 @@ ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops)
* or does per cpu logic, then we need to call the assist handler.
*/
if (!(ops->flags & FTRACE_OPS_FL_RECURSION_SAFE) ||
- ops->flags & (FTRACE_OPS_FL_RCU | FTRACE_OPS_FL_PER_CPU))
+ ops->flags & FTRACE_OPS_FL_RCU)
return ftrace_ops_assist_func;
return ops->func;