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-rw-r--r--kernel/resource.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/resource.c b/kernel/resource.c
index 82aea814d409..cee12cc47cab 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -486,6 +486,24 @@ int adjust_resource(struct resource *res, resource_size_t start, resource_size_t
EXPORT_SYMBOL(adjust_resource);
+/**
+ * resource_alignment - calculate resource's alignment
+ * @res: resource pointer
+ *
+ * Returns alignment on success, 0 (invalid alignment) on failure.
+ */
+resource_size_t resource_alignment(struct resource *res)
+{
+ switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) {
+ case IORESOURCE_SIZEALIGN:
+ return res->end - res->start + 1;
+ case IORESOURCE_STARTALIGN:
+ return res->start;
+ default:
+ return 0;
+ }
+}
+
/*
* This is compatibility stuff for IO resources.
*