linux-kernel - Re: [PATCH] x86: always define DECLARE_PCI

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Message-ID: <20081127114525.GC29013@elte.hu>
Date:	Thu, 27 Nov 2008 12:45:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Joerg Roedel <joerg.roedel@....com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	stable@...nel.org
Subject: Re: [PATCH] x86: always define DECLARE_PCI_UNMAP* macros


* Joerg Roedel <joerg.roedel@....com> wrote:

> Currently these macros evaluate to a no-op except the kernel is 
> compiled with GART or Calgary support. But we also need these macros 
> when we have SWIOTLB, VT-d or AMD IOMMU in the kernel. Since we 
> always compile at least with SWIOTLB we can define these macros 
> always. This patch is also for stable backport for the same reason 
> the SWIOTLB default selection patch is.
> 
> Cc: stable@...nel.org
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/include/asm/pci_64.h |   14 --------------
>  1 files changed, 0 insertions(+), 14 deletions(-)

applied to tip/x86/urgent (for v2.6.28), as this is a DMA mapping 
bugfix for IOMMUs. If the AMD IOMMU is turned on in the .config but 
CONFIG_GART_IOMMU is off (a rare but possible combo), we'd leak on 
unmap and crash the box quickly.

Jesse, is that path of upstream merge fine with you?

	Ingo
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