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Subject: Re: [PATCH v2 3/9] xen/balloon: Share common memory reservation
 routines
To:     Oleksandr Andrushchenko <andr2000@gmail.com>,
        xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org,
        jgross@suse.com, konrad.wilk@oracle.com
Cc:     daniel.vetter@intel.com, dongwon.kim@intel.com,
        matthew.d.roper@intel.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
References: <20180601114132.22596-1-andr2000@gmail.com>
 <20180601114132.22596-4-andr2000@gmail.com>
From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Message-ID: <4fd46fd8-f936-1514-06e4-34c5d3ed8960@oracle.com>
Date:   Mon, 4 Jun 2018 12:37:48 -0400
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Sender: linux-kernel-owner@vger.kernel.org
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On 06/01/2018 07:41 AM, Oleksandr Andrushchenko wrote:
> diff --git a/include/xen/mem-reservation.h b/include/xen/mem-reservation.h
> new file mode 100644
> index 000000000000..a727d65a1e61
> --- /dev/null
> +++ b/include/xen/mem-reservation.h
> @@ -0,0 +1,65 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +/*
> + * Xen memory reservation utilities.
> + *
> + * Copyright (c) 2003, B Dragovic
> + * Copyright (c) 2003-2004, M Williamson, K Fraser
> + * Copyright (c) 2005 Dan M. Smith, IBM Corporation
> + * Copyright (c) 2010 Daniel Kiper
> + * Copyright (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
> + */
> +
> +#ifndef _XENMEM_RESERVATION_H
> +#define _XENMEM_RESERVATION_H
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +
> +#include <asm/xen/hypercall.h>
> +#include <asm/tlb.h>
> +
> +#include <xen/interface/memory.h>
> +#include <xen/page.h>
> +
> +#ifdef CONFIG_XEN_SCRUB_PAGES
> +void xenmem_reservation_scrub_page(struct page *page);
> +#else
> +static inline void xenmem_reservation_scrub_page(struct page *page)
> +{
> +}
> +#endif


Given that this is a wrapper around a single call I'd prefer

inline void xenmem_reservation_scrub_page(struct page *page)
{
#ifdef CONFIG_XEN_SCRUB_PAGES
    clear_highpage(page);
#endif
}


-boris