On Fri, Mar 5, 2021 at 10:24 AM Geert Uytterhoeven [off-list ref] wrote:

On Fri, Mar 5, 2021 at 12:26 AM [off-list ref] wrote:

quoted

quoted

quoted

On 3/2/21 11:26 PM, Sergei Trofimovich wrote:

struct CommandList {
        struct CommandListHeader Header;                 /*     0    20 */
        struct RequestBlock Request;                     /*    20    20 */
        struct ErrDescriptor ErrDesc;                    /*    40    12 */
        struct SGDescriptor SG[32];                      /*    52   512 */
        /* --- cacheline 8 boundary (512 bytes) was 52 bytes ago --- */
        u32                        busaddr;              /*   564     4 */
        struct ErrorInfo *         err_info;             /*   568     8 */
        /* --- cacheline 9 boundary (576 bytes) --- */
        struct ctlr_info *         h;                    /*   576     8 */
        int                        cmd_type;             /*   584     4 */
        long int                   cmdindex;             /*   588     8 */
        struct completion *        waiting;              /*   596     8 */
        struct scsi_cmnd *         scsi_cmd;             /*   604     8 */
        struct work_struct work;                         /*   612    32 */
        /* --- cacheline 10 boundary (640 bytes) was 4 bytes ago --- */
        struct hpsa_scsi_dev_t *   phys_disk;            /*   644     8 */
        struct hpsa_scsi_dev_t *   device;               /*   652     8 */
        bool                       retry_pending;        /*   660     1 */
        atomic_t                   refcount;             /*   661     4 */

How come this atomic_t is no longer aligned to its natural alignment?

There is a

#pragma pack(1)

in linux 203 of this file!

It looks like some of the members in struct raid_map_data
and struct CommandListHeader need to be annotated as packed,
but the file accidentally packs everything until the '#pragma pack()'
in line 875, including the kernel-side CommandList data structure
that clearly must not be packed.

        Arnd