Re: [clk:hb_3.5 11/12] drivers/ata/ahci_platform.c:129:2: warning: initialization discards 'const' q

[Fengguang Wu <wfg@linux.intel.com>]

On Mon, Jul 09, 2012 at 01:17:51AM +0800, wfg@linux.intel.com wrote:
> Hi Rob,
> 
> There are new compile warnings show up in
> 
> tree:   git://sources.calxeda.com/kernel/linux.git hb_3.5
> head:   67e0749b2f1c5908346485f5cb54af9f3a01e047
> commit: df55ea8b7785fb704475ad562d445ac402719dc0 [11/12] ahci_platform: add custom hard reset for Calxeda ahci ctrlr
> 
> All warnings:
> 
>         drivers/ata/ahci_platform.c:125:9: sparse: Initializer entry defined twice
>         drivers/ata/ahci_platform.c:125:9:   also defined here

That warning is due to

        #define AHCI_SHT(drv_name)                                              \
                ATA_NCQ_SHT(drv_name),                                          \
=>             .can_queue              = AHCI_MAX_CMDS - 1,                    \
                .sg_tablesize           = AHCI_MAX_SG,                          \
                .dma_boundary           = AHCI_DMA_BOUNDARY,                    \
                .shost_attrs            = ahci_shost_attrs,                     \
=>             .sdev_attrs             = ahci_sdev_attrs

Re initilizes .can_queue and sdev_attrs to different values that was initially
defined in 

        #define ATA_BASE_SHT(drv_name)                                  \
                .module                 = THIS_MODULE,                  \
                .name                   = drv_name,                     \
                .ioctl                  = ata_scsi_ioctl,               \
                .queuecommand           = ata_scsi_queuecmd,            \
=>             .can_queue              = ATA_DEF_QUEUE,                \
                .this_id                = ATA_SHT_THIS_ID,              \
                .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,          \
                .emulated               = ATA_SHT_EMULATED,             \
                .use_clustering         = ATA_SHT_USE_CLUSTERING,       \
                .proc_name              = drv_name,                     \
                .slave_configure        = ata_scsi_slave_config,        \
                .slave_destroy          = ata_scsi_slave_destroy,       \
                .bios_param             = ata_std_bios_param,           \
                .unlock_native_capacity = ata_scsi_unlock_native_capacity, \
=>             .sdev_attrs             = ata_common_sdev_attrs

        #define ATA_NCQ_SHT(drv_name)                                   \
                ATA_BASE_SHT(drv_name),                                 \
                .change_queue_depth     = ata_scsi_change_queue_depth

Perhaps not easily fixable..

>         drivers/ata/ahci_platform.c:129:67: sparse: incorrect type in initializer (different modifiers)
>         drivers/ata/ahci_platform.c:129:67:    expected void *data
>         drivers/ata/ahci_platform.c:129:67:    got struct ata_port_info static const [toplevel] *
>         drivers/ata/ahci_platform.c:129:2: warning: initialization discards 'const' qualifier from pointer target type [enabled by default]

Rob,

Please consider folding this trivial fix for that warning.

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 9a155ba..a7fcd0a 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -126,7 +126,7 @@ static struct scsi_host_template ahci_platform_sht = {
 };
 
 static const struct of_device_id ahci_of_match[] = {
-	{ .compatible = "calxeda,hb-ahci", .data = &ahci_port_info[CALXEDA_AHCI], },
+	{ .compatible = "calxeda,hb-ahci", .data = (void *)&ahci_port_info[CALXEDA_AHCI], },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);