Re: [PATCH v2] mm: Add unmap_mapping_pages

[Ross Zwisler <ross.zwisler@linux.intel.com>]

On Tue, Dec 05, 2017 at 07:44:53AM -0800, Matthew Wilcox wrote:
> v2:
>  - Fix inverted mask in dax.c
>  - Pass 'false' instead of '0' for 'only_cows'
>  - nommu definition
> 
> >From ceee2e58548a5264b61000c02371956a1da3bee4 Mon Sep 17 00:00:00 2001
> From: Matthew Wilcox <mawilcox@microsoft.com>
> Date: Tue, 5 Dec 2017 00:15:54 -0500
> Subject: [PATCH] mm: Add unmap_mapping_pages
> 
> Several users of unmap_mapping_range() would much prefer to express
> their range in pages rather than bytes.  Unfortuately, on a 32-bit
> kernel, you have to remember to cast your page number to a 64-bit type
> before shifting it, and four places in the current tree didn't remember
> to do that.  That's a sign of a bad interface.
> 
> Conveniently, unmap_mapping_range() actually converts from bytes into
> pages, so hoist the guts of unmap_mapping_range() into the new function
> unmap_mapping_pages() and convert the callers which want to use pages.
> 
> Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
> Reported-by: "zhangyi (F)" <yi.zhang@huawei.com>

Looks good.  You can add:

Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>

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