[SCSI] hpsa: Clarify calculation of padding for commandlist structure

	void   *scsi_cmd;

	void   *scsi_cmd;

/* on 64 bit architectures, to get this to be 32-byte-aligned

/* on 64 bit architectures, to get this to be 32-byte-aligned

 * it so happens we need no padding, on 32 bit systems,

 * it so happens we need PAD_64 bytes of padding, on 32 bit systems,

 * we need 8 bytes of padding.   This does that.

 * we need PAD_32 bytes of padding (see below).   This does that.

 * If it happens that 64 bit and 32 bit systems need different

 * padding, PAD_32 and PAD_64 can be set independently, and.

 * the code below will do the right thing.

 */

 */

#define COMMANDLIST_PAD ((8 - sizeof(long))/4 * 8)

#define IS_32_BIT ((8 - sizeof(long))/4)

#define IS_64_BIT (!IS_32_BIT)

#define PAD_32 (8)

#define PAD_64 (0)

#define COMMANDLIST_PAD (IS_32_BIT * PAD_32 + IS_64_BIT * PAD_64)

	u8 pad[COMMANDLIST_PAD];

	u8 pad[COMMANDLIST_PAD];

};

};

/* Configuration Table Structure */

/* Configuration Table Structure */