[PATCH V4 1/2] mm: Update generic gup implementation to handle hugepage directory

[David Miller]

From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
Date: Wed, 29 Oct 2014 13:49:44 +0530

> +/*
> + * Some architectures requires a hugepage directory format that is
> + * required to support multiple hugepage sizes. For example
> + * a4fe3ce7699bfe1bd88f816b55d42d8fe1dac655 introduced the same
> + * on powerpc. This allows for a more flexible hugepage pagetable
> + * layout.
> + */

Please don't put commit IDs into the actual code.

If that commit gets backported to -stable or another tree, then this
comment will send someone on a wild goose chase.