linux-kernel - Re: [HMM 07/16] mm/migrate: new memory migration helper for use with device memory v4

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Message-Id: <20170316160520.d03ac02474cad6d2c8eba9bc@linux-foundation.org>
Date:   Thu, 16 Mar 2017 16:05:20 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        John Hubbard <jhubbard@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Evgeny Baskakov <ebaskakov@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 07/16] mm/migrate: new memory migration helper for use
 with device memory v4

On Thu, 16 Mar 2017 12:05:26 -0400 Jérôme Glisse <jglisse@...hat.com> wrote:

> +static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
> +{
> +	if (!(mpfn & MIGRATE_PFN_VALID))
> +		return NULL;
> +	return pfn_to_page(mpfn & MIGRATE_PFN_MASK);
> +}

i386 allnoconfig:

In file included from mm/page_alloc.c:61:
./include/linux/migrate.h: In function 'migrate_pfn_to_page':
./include/linux/migrate.h:139: warning: left shift count >= width of type
./include/linux/migrate.h:141: warning: left shift count >= width of type
./include/linux/migrate.h: In function 'migrate_pfn_size':
./include/linux/migrate.h:146: warning: left shift count >= width of type