The AMD architecture for the Frontier supercomputer will have device memory which can be coherently accessed by the CPU. The system BIOS advertises this memory as SPM (special purpose memory) in the UEFI system address map.
The AMDGPU driver needs to be able to lookup this resource in order to claim it as MEMORY_DEVICE_GENERIC using devm_memremap_pages.
Signed-off-by: Alex Sierra alex.sierra@amd.com --- kernel/resource.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/kernel/resource.c b/kernel/resource.c index ca9f5198a01f..227fc9fab573 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -772,6 +772,7 @@ struct resource *lookup_resource(struct resource *root, resource_size_t start)
return res; } +EXPORT_SYMBOL_GPL(lookup_resource);
/* * Insert a resource into the resource tree. If successful, return NULL,