From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760291Ab3CHDG4 (ORCPT ); Thu, 7 Mar 2013 22:06:56 -0500 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:8706 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759538Ab3CHDGy (ORCPT ); Thu, 7 Mar 2013 22:06:54 -0500 X-Authority-Analysis: v=2.0 cv=H5hZMpki c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=Ciwy3NGCPMMA:10 a=3i6TJGG1RiYA:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=ArjVyjqUlYsA:10 a=20KFwNOVAAAA:8 a=6EEvkdkcoNwE-etnRgYA:9 a=jEp0ucaQiEUA:10 a=jeBq3FmKZ4MA:10 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-Id: <20130308030651.990309877@goodmis.org> User-Agent: quilt/0.60-1 Date: Thu, 07 Mar 2013 21:59:59 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton , Thomas Gleixner , Frederic Weisbecker , Masami Hiramatsu , David Sharp , Vaibhav Nagarnaik , hcochran@lexmark.com, Hiraku Toyooka Subject: [for-next][PATCH 01/17] ring-buffer: Init waitqueue for blocked readers References: <20130308025958.501479677@goodmis.org> Content-Disposition: inline; filename=0001-ring-buffer-Init-waitqueue-for-blocked-readers.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Steven Rostedt (Red Hat)" The move of blocked readers to the ring buffer left out the init of the wait queue that is used. Tests missed this due to running stress tests against the buffers, which didn't allow for any readers to end up waiting. Running a simple read and wait triggered a bug. Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 56b6ea3..65fe2a4 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -1185,6 +1185,7 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int nr_pages, int cpu) INIT_WORK(&cpu_buffer->update_pages_work, update_pages_handler); init_completion(&cpu_buffer->update_done); init_irq_work(&cpu_buffer->irq_work.work, rb_wake_up_waiters); + init_waitqueue_head(&cpu_buffer->irq_work.waiters); bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()), GFP_KERNEL, cpu_to_node(cpu)); @@ -1281,6 +1282,7 @@ struct ring_buffer *__ring_buffer_alloc(unsigned long size, unsigned flags, buffer->reader_lock_key = key; init_irq_work(&buffer->irq_work.work, rb_wake_up_waiters); + init_waitqueue_head(&buffer->irq_work.waiters); /* need at least two pages */ if (nr_pages < 2) -- 1.7.10.4