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Message-ID: <1227284770-19215-2-git-send-email-joerg.roedel@amd.com> Date: Fri, 21 Nov 2008 17:26:01 +0100 From: Joerg Roedel <joerg.roedel@....com> To: Ingo Molnar <mingo@...hat.com>, Thomas Gleixner <tglx@...utronix.de> CC: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, iommu@...ts.linux-foundation.org, Joerg Roedel <joerg.roedel@....com> Subject: [PATCH 01/10] x86: add Kconfig entry for DMA-API debugging Impact: adds a new Kconfig option Signed-off-by: Joerg Roedel <joerg.roedel@....com> --- arch/x86/Kconfig.debug | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 2a3dfbd..d4fafd5 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -162,6 +162,18 @@ config DOUBLEFAULT option saves about 4k and might cause you much additional grey hair. +config DMA_API_DEBUG + default n + bool "Enable debugging of DMA-API usage" + depends on X86 + 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. + config IOMMU_DEBUG bool "Enable IOMMU debugging" depends on GART_IOMMU && DEBUG_KERNEL -- 1.5.6.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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