Re: [Qemu-devel] [PATCH v3 04/52] acpi: factor out ACPI const int packing out of build_append_value()

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Feb 09, 2015 at 10:53:26AM +0000, Igor Mammedov wrote:
> it will be reused for adding a plain integer value into AML.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  hw/acpi/aml-build.c  | 19 +++----------------
>  hw/i386/acpi-build.c |  6 +++---
>  2 files changed, 6 insertions(+), 19 deletions(-)
> 
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 096f347..67d1371 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -221,24 +221,8 @@ void build_extop_package(GArray *package, uint8_t op)
>  
>  void build_append_value(GArray *table, uint32_t value, int size)
>  {
> -    uint8_t prefix;
>      int i;
>  
> -    switch (size) {
> -    case 1:
> -        prefix = 0x0A; /* BytePrefix */
> -        break;
> -    case 2:
> -        prefix = 0x0B; /* WordPrefix */
> -        break;
> -    case 4:
> -        prefix = 0x0C; /* DWordPrefix */
> -        break;
> -    default:
> -        assert(0);
> -        return;
> -    }
> -    build_append_byte(table, prefix);
>      for (i = 0; i < size; ++i) {
>          build_append_byte(table, value & 0xFF);
>          value = value >> 8;

This really makes this an awkward API,
you must remember to add the prefix.
IMO you want a new name - build_append_value_noprefix maybe -
then call build_append_value_noprefix from build_append_value.

But really, it's best to squash such changes with
where they are used, it's just making review harder:
as you add APIs with no documentation, I can't
see what they do without reading follow up patch
to see how they are used.


> @@ -252,10 +236,13 @@ void build_append_int(GArray *table, uint32_t value)
>      } else if (value == 0x01) {
>          build_append_byte(table, 0x01); /* OneOp */
>      } else if (value <= 0xFF) {
> +        build_append_byte(table, 0x0A); /* BytePrefix */
>          build_append_value(table, value, 1);
>      } else if (value <= 0xFFFF) {
> +        build_append_byte(table, 0x0B); /* WordPrefix */
>          build_append_value(table, value, 2);
>      } else {
> +        build_append_byte(table, 0x0C); /* DWordPrefix */
>          build_append_value(table, value, 4);
>      }
>  }
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 788962e..a1bf450 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -302,14 +302,14 @@ static void build_append_and_cleanup_method(GArray *device, GArray *method)
>  
>  static void build_append_notify_target_ifequal(GArray *method,
>                                                 GArray *target_name,
> -                                               uint32_t value, int size)
> +                                               uint32_t value)
>  {
>      GArray *notify = build_alloc_array();
>      uint8_t op = 0xA0; /* IfOp */
>  
>      build_append_byte(notify, 0x93); /* LEqualOp */
>      build_append_byte(notify, 0x68); /* Arg0Op */
> -    build_append_value(notify, value, size);
> +    build_append_int(notify, value);
>      build_append_byte(notify, 0x86); /* NotifyOp */
>      build_append_array(notify, target_name);
>      build_append_byte(notify, 0x69); /* Arg1Op */
> @@ -578,7 +578,7 @@ build_append_notify_method(GArray *device, const char *name,
>          GArray *target = build_alloc_array();
>          build_append_namestring(target, format, i);
>          assert(i < 256); /* Fits in 1 byte */
> -        build_append_notify_target_ifequal(method, target, i, 1);
> +        build_append_notify_target_ifequal(method, target, i);
>          build_free_array(target);
>      }
>  
> -- 
> 1.8.3.1