uprobes/tracing: Kill the pointless local_save_flags/preempt_count calls

uprobe_trace_func() is never called with irqs or preemption
disabled, no need to ask preempt_count() or local_save_flags().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Anton Arapov <anton@redhat.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 8e009016e4ba..43d258db998e 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -492,17 +492,13 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
         struct ring_buffer_event *event;
         struct ring_buffer *buffer;
         u8 *data;
-        int size, i, pc;
-        unsigned long irq_flags;
+        int size, i;
         struct ftrace_event_call *call = &tu->call;
 
-        local_save_flags(irq_flags);
-        pc = preempt_count();
-
         size = sizeof(*entry) + tu->size;
 
         event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
-                                                  size, irq_flags, pc);
+                                                  size, 0, 0);
         if (!event)
                 return 0;
 
@@ -513,7 +509,7 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
                 call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
 
         if (!filter_current_check_discard(buffer, call, entry, event))
-                trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
+                trace_buffer_unlock_commit(buffer, event, 0, 0);
 
         return 0;
 }