libata: reorder ata_queued_cmd to remove alignment padding on 64 bit builds

Reorder structure ata_queued_cmd to remove 8 bytes of alignment padding
on 64 bit builds & therefore reduce the size of structure ata_port by
256 bytes.

Overall this will have little impact, other than reducing the amount of
memory that is cleared when allocating ata_ports.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 52112d39d71e5e1f8476b9edd0fce5310f3ea879..15efec05df67be3ad44f7eb78db100853749f5fc 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -570,13 +570,13 @@ struct ata_queued_cmd {
        unsigned int            extrabytes;
        unsigned int            curbytes;
 
-       struct scatterlist      *cursg;
-       unsigned int            cursg_ofs;
-
        struct scatterlist      sgent;
 
        struct scatterlist      *sg;
 
+       struct scatterlist      *cursg;
+       unsigned int            cursg_ofs;
+
        unsigned int            err_mask;
        struct ata_taskfile     result_tf;
        ata_qc_cb_t             complete_fn;