linux-kernel - Re: [PATCH v8 1/6] software node: rename is_array to is

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Date:   Fri, 8 Nov 2019 10:49:38 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v8 1/6] software node: rename is_array to is_inline

On Fri, Nov 8, 2019 at 5:22 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> We do not need a special flag to know if we are dealing with an array,
> as we can get that data from ratio between element length and the data
> size, however we do need a flag to know whether the data is stored
> directly inside property_entry or separately.

So the subject is slightly misleading, because it is not a rename.  I
would say "replace x with y" instead.

[Arguably I can change that when applying the patch, but since we are
going to wait for the dependencies to go in, it should not be a big
deal to send an update of this patch alone?]

> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/base/swnode.c    | 12 +++++-------
>  include/linux/property.h | 13 ++++++++-----
>  2 files changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index d8d0dc0ca5acf..18a30fb3cc588 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -108,10 +108,7 @@ static const void *property_get_pointer(const struct property_entry *prop)
>         if (!prop->length)
>                 return NULL;
>
> -       if (prop->is_array)
> -               return prop->pointer;
> -
> -       return &prop->value;
> +       return prop->is_inline ? &prop->value : prop->pointer;
>  }
>
>  static const void *property_entry_find(const struct property_entry *props,
> @@ -205,7 +202,7 @@ static void property_entry_free_data(const struct property_entry *p)
>         const char * const *src_str;
>         size_t i, nval;
>
> -       if (p->is_array) {
> +       if (!p->is_inline) {
>                 if (p->type == DEV_PROP_STRING && p->pointer) {
>                         src_str = p->pointer;
>                         nval = p->length / sizeof(const char *);
> @@ -250,7 +247,7 @@ static int property_entry_copy_data(struct property_entry *dst,
>         const void *pointer = property_get_pointer(src);
>         const void *new;
>
> -       if (src->is_array) {
> +       if (!src->is_inline) {
>                 if (!src->length)
>                         return -ENODATA;
>
> @@ -264,15 +261,16 @@ static int property_entry_copy_data(struct property_entry *dst,
>                                 return -ENOMEM;
>                 }
>
> -               dst->is_array = true;
>                 dst->pointer = new;
>         } else if (src->type == DEV_PROP_STRING) {
>                 new = kstrdup(src->value.str, GFP_KERNEL);
>                 if (!new && src->value.str)
>                         return -ENOMEM;
>
> +               dst->is_inline = true;
>                 dst->value.str = new;
>         } else {
> +               dst->is_inline = true;
>                 dst->value = src->value;
>         }
>
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 48335288c2a96..dad0ad11b55e2 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -227,15 +227,17 @@ static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
>   * struct property_entry - "Built-in" device property representation.
>   * @name: Name of the property.
>   * @length: Length of data making up the value.
> - * @is_array: True when the property is an array.
> + * @is_inline: True when the property value is embedded in
> + *     &struct property_entry instance.
>   * @type: Type of the data in unions.
> - * @pointer: Pointer to the property (an array of items of the given type).
> - * @value: Value of the property (when it is a single item of the given type).
> + * @pointer: Pointer to the property when it is stored separately from
> + *     the &struct property_entry instance.
> + * @value: Value of the property when it is stored inline.

And while at it, can you please try to make the comments shorter so
they each take one line?