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Subject: Re: [PATCH 2/8] xen/balloon: Move common memory reservation routines
 to a module
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>
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From:   Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Date:   Wed, 30 May 2018 15:24:13 -0400
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Sender: linux-kernel-owner@vger.kernel.org
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On 05/30/2018 01:46 PM, Oleksandr Andrushchenko wrote:
> On 05/30/2018 06:54 PM, Boris Ostrovsky wrote:
>>
>>
>> BTW, I also think you can further simplify
>> xenmem_reservation_va_mapping_* routines by bailing out right away if
>> xen_feature(XENFEAT_auto_translated_physmap). In fact, you might even
>> make them inlines, along the lines of
>>
>> inline void xenmem_reservation_va_mapping_reset(unsigned long count,
>>                      struct page **pages)
>> {
>> #ifdef CONFIG_XEN_HAVE_PVMMU
>>     if (!xen_feature(XENFEAT_auto_translated_physmap))
>>         __xenmem_reservation_va_mapping_reset(...)
>> #endif
>> }
> How about:
>
> #ifdef CONFIG_XEN_HAVE_PVMMU
> static inline __xenmem_reservation_va_mapping_reset(struct page *page)
> {
> [...]
> }
> #endif
>
> and
>
> void xenmem_reservation_va_mapping_reset(unsigned long count,
>                      struct page **pages)
> {
> #ifdef CONFIG_XEN_HAVE_PVMMU
>     if (!xen_feature(XENFEAT_auto_translated_physmap)) {
>         int i;
>
>         for (i = 0; i < count; i++)
>             __xenmem_reservation_va_mapping_reset(pages[i]);
>     }
> #endif
> }
>
> This way I can use __xenmem_reservation_va_mapping_reset(page);
> instead of xenmem_reservation_va_mapping_reset(1, &page);


Sure, this also works.

-boris