linux-kernel - [PATCH 1/5] iommu: Move initialization earlier

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Message-Id: <51875a31.25ac440a.50d9.ffffe8fd@mx.google.com>
Date:	Mon,  6 May 2013 17:21:57 +1000
From:	aik@...abs.ru
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Alexander Graf <agraf@...e.de>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: [PATCH 1/5] iommu: Move initialization earlier

From: Alexey Kardashevskiy <aik@...abs.ru>

The iommu_init() call initializes IOMMU internal structures and data
required for the API to function such as iommu_group_alloc().
It is registered as a subsys_initcall.

One of the IOMMU users is a PCI subsystem on POWER which discovers new
IOMMU tables during the PCI scan so the most logical place to call
iommu_group_alloc() is when a new group is just discovered. However
PCI scan is done from subsys_initcall hook as well, which makes
use of the IOMMU API impossible.

This moves IOMMU subsystem initialization one step earlier.

Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
Cc: David Gibson <david@...son.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@...ba.org>
---
 drivers/iommu/iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 5514dfa..0de83eb 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -890,7 +890,7 @@ static int __init iommu_init(void)
 
 	return 0;
 }
-subsys_initcall(iommu_init);
+arch_initcall(iommu_init);
 
 int iommu_domain_get_attr(struct iommu_domain *domain,
 			  enum iommu_attr attr, void *data)
-- 
1.7.10.4

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