From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yang Hongyang <yanghy@cn.fujitsu.com>
Subject: Re: [PATCH Remus v2 02/10] tools/libxc: introduce
 setup() and cleanup() on save
Date: Tue, 12 May 2015 15:04:36 +0800
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To: Ian Campbell <ian.campbell@citrix.com>
Cc: wei.liu2@citrix.com, eddie.dong@intel.com, wency@cn.fujitsu.com, Andrew Cooper <andrew.cooper3@citrix.com>, yunhong.jiang@intel.com, ian.jackson@eu.citrix.com, xen-devel@lists.xen.org, rshriram@cs.ubc.ca
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On 05/11/2015 07:49 PM, Ian Campbell wrote:
> On Mon, 2015-05-11 at 12:47 +0100, Ian Campbell wrote:
>>>>> Actually this is another trick that I need to deal with those
>>>>> hypercall macros.
>>>>> DECLARE_HYPERCALL_BUFFER_SHADOW will define a user pointer "dirty_bitmap"
>>>>> and a shadow buffer, although xc_hypercall_buffer_free_pages takes
>>>>> "dirty_bitmap" as an augument, but it is also a MACRO, without
>>>>> "if ( dirty_bitmap )", the compiler will report "dirty_bitmap" unused
>>>>> error...
>>>>
>>>> Ah, in which case you would be better using
>>>> xc__hypercall_buffer_free_pages() and not creating the local shadow in
>>>> the first place.
>>>
>>> I thought we'd better use those MACROs which described in the comments...
>>> If it is OK to use xc__hypercall_buffer_free_pages(), I will fix it in
>>> the next version.
>>
>> If anything I think I'd prefer for the if to move inside the
>> xc_hypercall_buffer_free_pages macro.
>
> Or if you want to use the "raw" xc__hypercall_buffer variant you should
> be consistent and do the same on allocation.

I think I will add a patch that move the if inside the
xc_hypercall_buffer_free_pages macro.

>
> Ian.
>
>
> .
>

-- 
Thanks,
Yang.