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authorOleg Nesterov <oleg@redhat.com>2013-03-28 19:19:11 +0100
committerOleg Nesterov <oleg@redhat.com>2013-04-13 15:32:00 +0200
commit0e3853d202e8b2720bc4c674dc58849b2662c8f8 (patch)
tree1985c7d62717dd07c2e3957acbb66515dc0ce65d /kernel/trace
parent456fdbcb8648a20f56977efbc6f13e28936fcf0b (diff)
downloadop-kernel-dev-0e3853d202e8b2720bc4c674dc58849b2662c8f8.zip
op-kernel-dev-0e3853d202e8b2720bc4c674dc58849b2662c8f8.tar.gz
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace_uprobe.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 8e00901..43d258d 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;
}
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