From mboxrd@z Thu Jan 1 00:00:00 1970 From: Randy Dunlap Subject: Re: [PATCH 01/16] dma-debug: add Kconfig entry Date: Fri, 9 Jan 2009 12:12:25 -0800 Message-ID: <20090109121225.a0b4bbee.randy.dunlap@oracle.com> References: <1231517970-20288-1-git-send-email-joerg.roedel@amd.com> <1231517970-20288-2-git-send-email-joerg.roedel@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, dwmw2@infradead.org, fujita.tomonori@lab.ntt.co.jp, netdev@vger.kernel.org, iommu@lists.linux-foundation.org To: Joerg Roedel Return-path: Received: from rcsinet11.oracle.com ([148.87.113.123]:20172 "EHLO rgminet11.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752926AbZAIUNV (ORCPT ); Fri, 9 Jan 2009 15:13:21 -0500 In-Reply-To: <1231517970-20288-2-git-send-email-joerg.roedel@amd.com> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, 9 Jan 2009 17:19:15 +0100 Joerg Roedel wrote: > Impact: add a Kconfig entry for DMA-API debugging Surely Impact: is (meant to be) different from the actual patch description... ? > Signed-off-by: Joerg Roedel > --- > arch/Kconfig | 2 ++ > lib/Kconfig.debug | 11 +++++++++++ > 2 files changed, 13 insertions(+), 0 deletions(-) > > diff --git a/arch/Kconfig b/arch/Kconfig > index 2e13aa2..068554c 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -103,3 +103,5 @@ config HAVE_CLK > The calls support software clock gating and > thus are a key power management tool on many systems. > > +config HAVE_DMA_API_DEBUG > + bool > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 2e75478..cba5778 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -899,6 +899,17 @@ config DYNAMIC_PRINTK_DEBUG > debugging for all modules. This mode can be turned off via the above > disable command. > > +config DMA_API_DEBUG > + bool "Enable debugging of DMA-API usage" > + depends on HAVE_DMA_API_DEBUG > + help > + Enable this option to debug the use of the DMA API by device drivers. > + With this option you will be able to detect common bugs in device > + drivers like double-freeing of DMA mappings or freeing mappings that > + were never allocated. > + This option causes a performance degredation. Use only if you want > + to debug device drivers. If unsure, say N. > + > source "samples/Kconfig" > > source "lib/Kconfig.kgdb" > -- --- ~Randy