Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7b6b57...
Commit:     7b6b574ca7d5d5ba6ae7155c1fb877cc7130eff7
Parent:     b556151110ff003ce77d84597400c84824690ccf
Author:     Benjamin Herrenschmidt <benh@kernel.crashing.org>
AuthorDate: Mon Oct 13 17:51:46 2008 +0000
Committer:  Benjamin Herrenschmidt <benh@kernel.crashing.org>
CommitDate: Wed Oct 15 10:13:29 2008 +1100

    powerpc: Fix link errors on 32-bit machines using legacy DMA
    
    The new merged DMA code will try to access isa_bridge_pcidev when
    trying to DMA to/from legacy devices. This is however only defined
    on 64-bit. Fixes this for now by adding the variable, even if it
    stays NULL. In the long run, we'll make isa-bridge.c common to
    32 and 64-bit.
    
    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/kernel/pci_32.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/pci_32.c b/arch/powerpc/kernel/pci_32.c
index a848c63..131b1df 100644
--- a/arch/powerpc/kernel/pci_32.c
+++ b/arch/powerpc/kernel/pci_32.c
@@ -53,6 +53,12 @@ LIST_HEAD(hose_list);
 
 static int pci_bus_count;
 
+/* This will remain NULL for now, until isa-bridge.c is made common
+ * to both 32-bit and 64-bit.
+ */
+struct pci_dev *isa_bridge_pcidev;
+EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
+
 static void
 fixup_hide_host_resource_fsl(struct pci_dev *dev)
 {
--
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