Re: [PATCH v4 01/37] qdev: remove unused qdev_prop_int64

[Markus Armbruster <armbru@redhat.com>]

Marc-André Lureau <marcandre.lureau@redhat.com> writes:

> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>  hw/core/qdev-properties.c    | 32 --------------------------------
>  include/hw/qdev-properties.h |  3 ---
>  2 files changed, 35 deletions(-)
>
> diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
> index ac28890e5a..be4cb01f0b 100644
> --- a/hw/core/qdev-properties.c
> +++ b/hw/core/qdev-properties.c
> @@ -409,31 +409,6 @@ static void set_uint64(Object *obj, Visitor *v, const char *name,
>      visit_type_uint64(v, name, ptr, errp);
>  }
>  
> -static void get_int64(Object *obj, Visitor *v, const char *name,
> -                      void *opaque, Error **errp)
> -{
> -    DeviceState *dev = DEVICE(obj);
> -    Property *prop = opaque;
> -    int64_t *ptr = qdev_get_prop_ptr(dev, prop);
> -
> -    visit_type_int64(v, name, ptr, errp);
> -}
> -
> -static void set_int64(Object *obj, Visitor *v, const char *name,
> -                      void *opaque, Error **errp)
> -{
> -    DeviceState *dev = DEVICE(obj);
> -    Property *prop = opaque;
> -    int64_t *ptr = qdev_get_prop_ptr(dev, prop);
> -
> -    if (dev->realized) {
> -        qdev_prop_set_after_realize(dev, name, errp);
> -        return;
> -    }
> -
> -    visit_type_int64(v, name, ptr, errp);
> -}
> -
>  const PropertyInfo qdev_prop_uint64 = {
>      .name  = "uint64",
>      .get   = get_uint64,
> @@ -441,13 +416,6 @@ const PropertyInfo qdev_prop_uint64 = {
>      .set_default_value = set_default_value_uint,
>  };
>  
> -const PropertyInfo qdev_prop_int64 = {
> -    .name  = "int64",
> -    .get   = get_int64,
> -    .set   = set_int64,
> -    .set_default_value = set_default_value_int,
> -};
> -
>  /* --- string --- */
>  
>  static void release_string(Object *obj, const char *name, void *opaque)
> diff --git a/include/hw/qdev-properties.h b/include/hw/qdev-properties.h
> index c6a8cb5516..690ff07ae2 100644
> --- a/include/hw/qdev-properties.h
> +++ b/include/hw/qdev-properties.h
> @@ -13,7 +13,6 @@ extern const PropertyInfo qdev_prop_uint16;
>  extern const PropertyInfo qdev_prop_uint32;
>  extern const PropertyInfo qdev_prop_int32;
>  extern const PropertyInfo qdev_prop_uint64;
> -extern const PropertyInfo qdev_prop_int64;
>  extern const PropertyInfo qdev_prop_size;
>  extern const PropertyInfo qdev_prop_string;
>  extern const PropertyInfo qdev_prop_chr;
> @@ -164,8 +163,6 @@ extern const PropertyInfo qdev_prop_pcie_link_width;
>      DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int32, int32_t)
>  #define DEFINE_PROP_UINT64(_n, _s, _f, _d)                      \
>      DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
> -#define DEFINE_PROP_INT64(_n, _s, _f, _d)                      \
> -    DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_int64, int64_t)
>  #define DEFINE_PROP_SIZE(_n, _s, _f, _d)                       \
>      DEFINE_PROP_UNSIGNED(_n, _s, _f, _d, qdev_prop_size, uint64_t)
>  #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d)                   \

History of its use:

    Author: Peter Xu <peterx@redhat.com>
    Date:   Tue Jul 18 11:39:01 2017 +0800

        qdev: provide DEFINE_PROP_INT64()

        We have nearly all the stuff, but this one is missing. Add it in.

        Am going to use this new helper for MigrationParameters fields, since
        most of them are int64_t.

        CC: Markus Armbruster <armbru@redhat.com>
        CC: Eduardo Habkost <ehabkost@redhat.com>
        CC: Marc-André Lureau <marcandre.lureau@redhat.com>
        CC: Peter Xu <peterx@redhat.com>
        CC: Juan Quintela <quintela@redhat.com>
        CC: Marcel Apfelbaum <marcel@redhat.com>
        CC: Eric Blake <eblake@redhat.com>
        Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
        Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
        Reviewed-by: Juan Quintela <quintela@redhat.com>
        Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
        Signed-off-by: Peter Xu <peterx@redhat.com>
        Message-Id: <1500349150-13240-2-git-send-email-peterx@redhat.com>
        Signed-off-by: Juan Quintela <quintela@redhat.com>

    commit 89632fafdc64927647b6f45416307cd3d4c746db
    Author: Peter Xu <peterx@redhat.com>
    Date:   Tue Jul 18 11:39:02 2017 +0800

        migration: export parameters to props

        Export migration parameters to qdev properties. Then we can use, for
        example:

          -global migration.x-cpu-throttle-initial=xxx

        To specify migration parameters during init.

        Prefix "x-" is appended for each parameter exported to show that this is
        not a stable interface, and only for debugging/testing purpose.

        Reviewed-by: Juan Quintela <quintela@redhat.com>
        Signed-off-by: Peter Xu <peterx@redhat.com>
        Message-Id: <1500349150-13240-3-git-send-email-peterx@redhat.com>
        Signed-off-by: Juan Quintela <quintela@redhat.com>

    [More commits adding uses...]

    commit 741d4086c856320807a2575389d7c0505578270b
    Author: Juan Quintela <quintela@redhat.com>
    Date:   Fri Dec 1 13:08:38 2017 +0100

        migration: Use proper types in json

        We use int for everything (int64_t), and then we check that value is
        between 0 and 255.  Change it to the valid types.

        This change only happens for HMP.  QMP always use bytes and similar.

        Signed-off-by: Juan Quintela <quintela@redhat.com>
        Reviewed-by: Eric Blake <eblake@redhat.com>

    [All uses gone again]

We can remove it now, and revert the removal when new uses pop up.
Churn.  I'd say remove if we think new uses are unlikely.  I doubt they
are.