From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752063AbaF0SdK (ORCPT ); Fri, 27 Jun 2014 14:33:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:18492 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751264AbaF0SdI (ORCPT ); Fri, 27 Jun 2014 14:33:08 -0400 Date: Fri, 27 Jun 2014 19:01:43 +0200 From: Oleg Nesterov To: Steven Rostedt Cc: Masami Hiramatsu , Namhyung Kim , Srikar Dronamraju , Tom Zanussi , "zhangwei(Jovi)" , linux-kernel@vger.kernel.org Subject: [PATCH 3/4] tracing/uprobes: Kill the bogus UPROBE_HANDLER_REMOVE code in uprobe_dispatcher() Message-ID: <20140627170143.GA18329@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140627170116.GA18298@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I do not know why dd9fa555d7bb "tracing/uprobes: Move argument fetching to uprobe_dispatcher()" added the UPROBE_HANDLER_REMOVE, but it looks wrong. OK, perhaps it makes sense to avoid store_trace_args() if the tracee is nacked by uprobe_perf_filter(). But then we should kill the same code in uprobe_perf_func() and unify the TRACE/PROFILE filtering (we need to do this anyway to mix perf/ftrace). Until then this code actually adds the pessimization because uprobe_perf_filter() will be called twice and return T in likely case. Signed-off-by: Oleg Nesterov --- kernel/trace/trace_uprobe.c | 6 ------ 1 files changed, 0 insertions(+), 6 deletions(-) diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 08e7970..c4cf0ab 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -1208,12 +1208,6 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs) current->utask->vaddr = (unsigned long) &udd; -#ifdef CONFIG_PERF_EVENTS - if ((tu->tp.flags & TP_FLAG_TRACE) == 0 && - !uprobe_perf_filter(&tu->consumer, 0, current->mm)) - return UPROBE_HANDLER_REMOVE; -#endif - if (WARN_ON_ONCE(!uprobe_cpu_buffer)) return 0; -- 1.5.5.1