On Tue, Aug 30, 2016 at 6:49 PM, <[email protected]> wrote: > From: Ankitprasad Sharma <[email protected]> > > Some modules, like i915.ko, needs to detect when certain ACPI features are > active inorder to prevent corruption on contended resources. > In particular, use of BIOS RapidStart Technology may corrupt the contents of > the reserved graphics memory, due to unalarmed hibernation. In which case > i915.ko cannot assume that it (reserved gfx memory) remains unmodified and > must recreate the contents and importantly not use it to store unrecoverable > user data.
The above doesn't explain why you need to export acpi_bus_type at all. I suspect that this is in order to be able to do some hackish stuff on it, so I'm not going to approve this patch as is. > Signed-off-by: Ankitprasad Sharma <[email protected]> > Cc: "Rafael J. Wysocki" <[email protected]> > Cc: Len Brown <[email protected]> > Cc: [email protected] > Cc: [email protected] > Signed-off-by: Jeff McGee <[email protected]> > --- > drivers/acpi/scan.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 4b22ea8..7461bab 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1269,6 +1269,7 @@ struct bus_type acpi_bus_type = { > .remove = acpi_device_remove, > .uevent = acpi_device_uevent, > }; > +EXPORT_SYMBOL_GPL(acpi_bus_type); > > static void acpi_device_del(struct acpi_device *device) > { > -- Thanks, Rafael
