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xen-devel
Re: [Xen-devel] [PATCH] fix build when CONFIG_COMPAT disabled
>>> Keir Fraser <keir@xxxxxxxxxxxxx> 11.01.07 16:47 >>>
>On 11/1/07 15:42, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
>
>> Properly conditionalize two places where compat-only structure fields get
>> accessed, and avoid compiler warnings on unused variables in two other
>> places.
>
>Should we bother to #ifdef where we don't need to? It's ugly and the
>compiler should be able to remove dead code where a condition evaluates to
>zero at compile time: we already have IS_COMPAT(d) hardcoded to zero if
>!CONFIG_COMPAT, which is enough to give the compiler a fair chance.
Generally no, but in the one case in the patch we have to, as the structure
member (mm_arg_xlat_l3) doesn't exist without CONFIG_COMPAT.
Jan
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