From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
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 teh contents and importantly not use it to
store unrecoverable user data.
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
drivers/acpi/bus.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index a212cef..69509c7 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -814,6 +814,7 @@ struct bus_type acpi_bus_type = {
.remove = acpi_device_remove,
.uevent = acpi_device_uevent,
};
+EXPORT_SYMBOL_GPL(acpi_bus_type);
/* --------------------------------------------------------------------------
Initialization/Cleanup
--
1.9.1
--
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