mainline build failure due to f1e4c916f97f ("drm/edid: add EDID block count and size helpers")

[Russell King (Oracle)]

On Mon, May 30, 2022 at 03:35:28PM +0200, Arnd Bergmann wrote:
> The annotations for edid are completely correct and necessary. However
> other driver authors just slap __packed annotations on any structure
> even if the layout is not fixed at all like:
> 
> struct my_driver_priv {
>        struct device dev;
>        u8 causes_misalignment;
>        spinlock_t lock;
>        atomic_t counter;
> } __packed; /* this annotation is harmful because it breaks the atomics */
> 
> or if the annotation does not change the layout like
> 
> struct my_dma_descriptor {
>      __le64 address;
>      __le64 length;
> } __packed; /* does not change layout but makes access slow on some
> architectures */

Sounds like we need a howto document for people to ignore and continue
doing their own thing. :P

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