Re: [Xen-devel] [PATCH v3 1/2] Interface for grant copy operation in libs.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jul 08, 2016 at 02:18:46PM +0100, Wei Liu wrote:
> To unblock Paulina on her series, I would be ok with the cast provided
> there is compile-time check to ensure the user-space structure is
> identical to the ioctl structure.
> 
> That would involve:
> 1. Introducing BUILD_BUG_ON, offsetof, alignof to libs/ if they are not
>    already available.

I just checked all these.

BUILD_BUG_ON is not there. A patch for it is trivial. I will do that
soon.

offsetof can be found in stddef.h.

alignof is C11 (we require C99), but there is __alignof__ gcc extension,
which clang also supports. We've been using that for quite a long time,
so I don't think we need to do anything about it.

Wei.

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