Re: [PATCH v1] ACPI: Switch to use generic UUID API

[Dan Williams]

On Thu, May 4, 2017 at 2:21 AM, Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> acpi_evaluate_dsm() and friends take a pointer to a raw buffer of 16
> bytes. Instead we convert them to use uuid_le type. At the same time we
> convert current users.
>
> acpi_str_to_uuid() becomes useless after the conversion and it's safe to
> get rid of it.
>
> The conversion fixes a potential bug in int340x_thermal as well since
> we have to use memcmp() on binary data.
>
> Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
> Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Amir Goldstein <amir73il@xxxxxxxxx>
> Cc: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
> Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> Cc: Joerg Roedel <joro@xxxxxxxxxx>
> Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> Cc: Yisen Zhuang <yisen.zhuang@xxxxxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
> Cc: Felipe Balbi <balbi@xxxxxxxxxx>
> Cc: Mathias Nyman <mathias.nyman@xxxxxxxxx>
> Cc: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> Cc: Liam Girdwood <lgirdwood@xxxxxxxxx>
> Cc: Mark Brown <broonie@xxxxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[..]
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 0f7982a1caaf..bd3e45ede056 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -74,11 +74,11 @@ struct nfit_table_prev {
>         struct list_head flushes;
>  };
>
> -static u8 nfit_uuid[NFIT_UUID_MAX][16];
> +static uuid_le nfit_uuid[NFIT_UUID_MAX];
>
> -const u8 *to_nfit_uuid(enum nfit_uuids id)
> +const uuid_le *to_nfit_uuid(enum nfit_uuids id)
>  {
> -       return nfit_uuid[id];
> +       return &nfit_uuid[id];
>  }
>  EXPORT_SYMBOL(to_nfit_uuid);
>
> @@ -207,7 +207,7 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
>         u32 offset, fw_status = 0;
>         acpi_handle handle;
>         unsigned int func;
> -       const u8 *uuid;
> +       const uuid_le *uuid;
>         int rc, i;
>
>         func = cmd;
> @@ -394,7 +394,7 @@ int nfit_spa_type(struct acpi_nfit_system_address *spa)
>         int i;
>
>         for (i = 0; i < NFIT_UUID_MAX; i++)
> -               if (memcmp(to_nfit_uuid(i), spa->range_guid, 16) == 0)
> +               if (!uuid_le_cmp_pp(to_nfit_uuid(i), (uuid_le *)spa->range_guid))

What is _cmp_pp? Why not _compare?

Other than that, looks ok to me.