Re: [PATCH 02/11] mm: Pass order to __alloc_pages_nodemask in GFP flags

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To: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH 02/11] mm: Pass order to __alloc_pages_nodemask in GFP flags
From: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Date: Thu, 9 May 2019 13:59:59 +0300
Cc: linux-mm@xxxxxxxxx
In-reply-to: <20190507040609.21746-3-willy@infradead.org>
References: <20190507040609.21746-1-willy@infradead.org> <20190507040609.21746-3-willy@infradead.org>
User-agent: NeoMutt/20180716

On Mon, May 06, 2019 at 09:06:00PM -0700, Matthew Wilcox wrote:
> +/*
> + * Extract the order from a GFP bitmask.
> + * Must be the top bits to avoid an AND operation.  Don't let
> + * __GFP_BITS_SHIFT get over 27

Should we have BUILD_BUG_ON() for this?

References:
- [RFC 00/11] Remove 'order' argument from many mm functions
  - From: Matthew Wilcox
- [PATCH 02/11] mm: Pass order to __alloc_pages_nodemask in GFP flags
  - From: Matthew Wilcox

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