Commit 11ef026e authored by Ira Weiny's avatar Ira Weiny Committed by Dan Williams
Browse files

cxl/uapi: Add warning on CXL command enum 



The CXL command enum is exported to user space and must maintain
backwards compatibility.

Add comment that new defines must be added to the end of the list.

Suggested-by: default avatarDan Williams <dan.j.williams@intel.com>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarDave Jiang <dave.jiang@intel.com>
Signed-off-by: default avatarIra Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20221222-cxl-misc-v4-2-62f701c1cdd1@intel.com


Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 860334e5

include/uapi/linux/cxl_mem.h

+4 −0
Original line number Diff line number Diff line
@@ -19,6 +19,10 @@ 
#define CXL_MEM_QUERY_COMMANDS _IOR(0xCE, 1, struct cxl_mem_query_commands)

#define CXL_MEM_SEND_COMMAND _IOWR(0xCE, 2, struct cxl_send_command)



/*

 * NOTE: New defines must be added to the end of the list to preserve

 * compatibility because this enum is exported to user space.

 */

#define CXL_CMDS                                                          \

	___C(INVALID, "Invalid Command"),                                 \

	___C(IDENTIFY, "Identify Command"),                               \