linux-kernel - Re: [GIT PULL] various IOMMU updates for 2.6.29

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Date:	Sat, 3 Jan 2009 23:56:27 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Joerg Roedel <joro@...tes.org>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>, gregkh@...e.de,
	avi@...hat.com, mingo@...hat.com, dwmw2@...radead.org,
	weidong.han@...el.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [GIT PULL] various IOMMU updates for 2.6.29

On Sat, Jan 03, 2009 at 11:11:35PM +0100, Joerg Roedel wrote:
> >   drivers/built-in.o: In function `alloc_iommu':
> >   : undefined reference to `iommu_calculate_agaw'
> > 
> 
> thanks for the report. I will look at it.
> 

Ok, this patch fixes the build problem. It should be safe but I can't
test this because I don't have any VT-d hardware. David, is this patch
ok?

commit c9740e758a5b024235429461540b7e5aabc21cc6
Author: Joerg Roedel <joerg.roedel@....com>
Date:   Sat Jan 3 23:46:21 2009 +0100

    intel-iommu: fix build error with INTR_REMAP=y and DMAR=n
    
    Impact: build fix (set agaw for iommu only if DMAR enabled)
    
    This fix should be safe since iommu->agaw is only used in intel-iommu.c.
    And this file is only compiled with DMAR=y.
    
    Signed-off-by: Joerg Roedel <joerg.roedel@....com>

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index f5a662a..2b4162d 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -491,7 +491,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
 	int map_size;
 	u32 ver;
 	static int iommu_allocated = 0;
-	int agaw;
+	int agaw = 0;
 
 	iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
 	if (!iommu)
@@ -507,6 +507,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
 	iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
 	iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
 
+#ifdef CONFIG_DMAR
 	agaw = iommu_calculate_agaw(iommu);
 	if (agaw < 0) {
 		printk(KERN_ERR
@@ -514,6 +515,7 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
 			iommu->seq_id);
 		goto error;
 	}
+#endif
 	iommu->agaw = agaw;
 
 	/* the registers might be more than one page */

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