[Intel-gfx] [PATCH] drm/i915/gem: Comment on inability to check args.pad for MMAP_OFFSET

[Joonas Lahtinen]

Quoting Chris Wilson (2019-12-08 00:26:44)
> Since we didn't check and insist that args.pad must be zero for MMAP_GTT
> historically, we cannot insert a check now as old userspace may be
> feeding in garbage. As such the lack of check is enshrined into the ABI,
> so add a comment to remind us we cannot add the check later.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas