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Date:   Thu, 12 Aug 2021 01:30:50 -0500
From:   Alex Sierra <>
Subject: [PATCH v5 03/13] kernel: resource: lookup_resource as exported symbol

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

Signed-off-by: Alex Sierra <>
 kernel/resource.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/resource.c b/kernel/resource.c
index 627e61b0c124..2d4abd395c73 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -783,6 +783,7 @@ struct resource *lookup_resource(struct resource *root, resource_size_t start)
 	return res;
  * Insert a resource into the resource tree. If successful, return NULL,

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