cxl/core: Replace unions with struct_group()

Use the newly introduced struct_group_typed() macro to clean up the
declaration of struct cxl_regs.

Cc: Alison Schofield <alison.schofield@intel.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-cxl@vger.kernel.org
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/lkml/1d9a2e6df2a9a35b2cdd50a9a68cac5991e7e5f0.camel@intel.com
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 53927f9fa77e460392c84eb86ab53da0337e72ea..9db0c402c9ce8bc7236c4d6d10dc71b3cdf7dd1e 100644 (file)
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -75,52 +75,27 @@ static inline int cxl_hdm_decoder_count(u32 cap_hdr)
 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
 
-#define CXL_COMPONENT_REGS() \
-       void __iomem *hdm_decoder
-
-#define CXL_DEVICE_REGS() \
-       void __iomem *status; \
-       void __iomem *mbox; \
-       void __iomem *memdev
-
-/* See note for 'struct cxl_regs' for the rationale of this organization */
-/*
- * CXL_COMPONENT_REGS - Common set of CXL Component register block base pointers
- * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
- */
-struct cxl_component_regs {
-       CXL_COMPONENT_REGS();
-};
-
-/* See note for 'struct cxl_regs' for the rationale of this organization */
-/*
- * CXL_DEVICE_REGS - Common set of CXL Device register block base pointers
- * @status: CXL 2.0 8.2.8.3 Device Status Registers
- * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
- * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
- */
-struct cxl_device_regs {
-       CXL_DEVICE_REGS();
-};
-
 /*
- * Note, the anonymous union organization allows for per
- * register-block-type helper routines, without requiring block-type
- * agnostic code to include the prefix.
+ * Using struct_group() allows for per register-block-type helper routines,
+ * without requiring block-type agnostic code to include the prefix.
  */
 struct cxl_regs {
-       union {
-               struct {
-                       CXL_COMPONENT_REGS();
-               };
-               struct cxl_component_regs component;
-       };
-       union {
-               struct {
-                       CXL_DEVICE_REGS();
-               };
-               struct cxl_device_regs device_regs;
-       };
+       /*
+        * Common set of CXL Component register block base pointers
+        * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
+        */
+       struct_group_tagged(cxl_component_regs, component,
+               void __iomem *hdm_decoder;
+       );
+       /*
+        * Common set of CXL Device register block base pointers
+        * @status: CXL 2.0 8.2.8.3 Device Status Registers
+        * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
+        * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
+        */
+       struct_group_tagged(cxl_device_regs, device_regs,
+               void __iomem *status, *mbox, *memdev;
+       );
 };
 
 struct cxl_reg_map {