2021-08-18 06:07:30

by Kees Cook

Subject: [PATCH v2 06/63] 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 <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: [email protected]
Suggested-by: Dan Williams <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]
Signed-off-by: Kees Cook <[email protected]>
---
drivers/cxl/cxl.h | 61 ++++++++++++++---------------------------------
1 file changed, 18 insertions(+), 43 deletions(-)

diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 53927f9fa77e..9db0c402c9ce 100644
--- 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 {
--
2.30.2

2021-08-18 22:37:58

by Dan Williams

Subject: Re: [PATCH v2 06/63] cxl/core: Replace unions with struct_group()

On Tue, Aug 17, 2021 at 11:06 PM Kees Cook <[email protected]> wrote:
>
> Use the newly introduced struct_group_typed() macro to clean up the
> declaration of struct cxl_regs.
>
> Cc: Alison Schofield <[email protected]>
> Cc: Vishal Verma <[email protected]>
> Cc: Ira Weiny <[email protected]>
> Cc: Ben Widawsky <[email protected]>
> Cc: [email protected]
> Suggested-by: Dan Williams <[email protected]>

Looks good and tests ok here:

Reviewed-by: Dan Williams <[email protected]>