[PATCH 1/5] ARM: add EXPORT_SYMBOL of hook_fault_code for PCI host modularization

On Sunday 07 February 2016 19:00:40 Paul Gortmaker wrote:

In a discussion of a previous patch set[1], it was suggested that
modularizing some of the PCI host support would be good to keep
multi platform bzImage sizes smaller.

Two of the files that are candidates for conversion to tristate
from bool are:

drivers/pci/host/pci-imx6.c
drivers/pci/host/pci-keystone.c

However, doing the conversion reveals that they are going to fail
at modpost time since hook_fault_code isn't currently exported.

Since we are now going to export it we also need to remove the
__init tag, as the fcn needs to be present at insmod time.

[1] https://lkml.kernel.org/r/20160108203102.GH5354 at localhost

If we want to make hook_fault_code() visible, we at least also need
an unhook_fault_code() function that removes the fault handler
when unloading the module, and preferably does so in a safe way.

The usage of hook_fault_code() at least in the imx driver is also
problematic, as it just ignores all "imprecise external abort"
faults, whether they come from PCI or not.

	Arnd