nvme: reorder fields in 'struct nvme_ctrl'

Group some variables based on their sizes to reduce holes.
On x86_64, this shrinks the size of 'struct nvme_ctrl' from 5368 to 5344
bytes when all CONFIG_* are defined.

This structure is embedded into some other structures, so it helps reducing
their size as well.

Signed-off-by: Christophe JAILLET <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

Author: tititiou36

drivers/nvme/host/nvme.h

@@ -246,8 +246,8 @@ enum nvme_ctrl_flags {
 
 struct nvme_ctrl {
 	bool comp_seen;
-	enum nvme_ctrl_state state;
 	bool identified;
+	enum nvme_ctrl_state state;
 	spinlock_t lock;
 	struct mutex scan_lock;
 	const struct nvme_ctrl_ops *ops;
@@ -279,8 +279,8 @@ struct nvme_ctrl {
 	char name[12];
 	u16 cntlid;
 
-	u32 ctrl_config;
 	u16 mtfa;
+	u32 ctrl_config;
 	u32 queue_count;
 
 	u64 cap;
@@ -353,10 +353,10 @@ struct nvme_ctrl {
 	bool apst_enabled;
 
 	/* PCIe only: */
+	u16 hmmaxd;
 	u32 hmpre;
 	u32 hmmin;
 	u32 hmminds;
-	u16 hmmaxd;
 
 	/* Fabrics only */
 	u32 ioccsz;