Re: linux-next: manual merge of the devicetree tree with the powerpc tree

Hi Grant,

quoted

Today's linux-next merge of the devicetree tree got a conflict in
include/linux/of.h between commit eb740b5f3e65 ("powerpc/eeh: Introduce
EEH device") from the powerpc tree and commit 0f22dd395fc4 ("of: Only
compile OF_DYNAMIC on PowerPC pseries and iseries") from the devicetree
tree.

Just context changes.  I fixed it up (see below) and can carry the fix as
necessary.
-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

diff --cc include/linux/of.h
index bdb1c07,533603e..0000000

--- a/include/linux/of.h
+++ b/include/linux/of.h

@@@ -75,14 -72,10 +75,17 @@@ struct of_phandle_args 
  	uint32_t args[MAX_PHANDLE_ARGS];
  };
  
 +#if defined(CONFIG_EEH)
 +static inline struct eeh_dev *of_node_to_eeh_dev(struct device_node *dn)
 +{
 +	return dn->edev;
 +}
 +#endif

Ben, What is this?  I don't want the eeh_dev pointer in struct device_node.  Up to
now we've avoided putting any reverse references into device_nodes.  For everything
else we use a reverse lookup, particularly for devices, to avoid growing the
device_node for each new type of lookup.

It's used to trace the EEH device. When EEH (Enhanced Error Hanlding) is enabled,
EEH device will be created against PCI sensitive OF node to trace the EEH state
accordingly. Since you don't want see this in struct device_node, we have to change
struct eeh_dev for a little bit to so that all struct eeh_dev instances will form
a global list and we can search eeh_dev according to the given device_node through
the global list. 

I don't know the policy or rule here for much. I think we can have 2 options.

1. Keep the code as being, and fix it later.
2. Fix it now.

Thanks,
Gavin