Re: [Xen-devel] [PATCH 2/2] x86: fix indirect thunk usage of CONFIG_INDIRECT_THUNK

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.01.18 at 16:48, <roger.pau@xxxxxxxxxx> wrote:
> When indirect_thunk_asm.h is instantiated directly into assembly files
> CONFIG_INDIRECT_THUNK might not be defined, and thus using .if against
> it is wrong.
> 
> Add a check to define CONFIG_INDIRECT_THUNK to 0 if not defined, so
> that using .if CONFIG_INDIRECT_THUNK is always correct.
> 
> This suppresses the following clang error:
> 
> <instantiation>:8:9: error: expected absolute expression
>     .if CONFIG_INDIRECT_THUNK == 1
>         ^
> <instantiation>:1:1: note: while in macro instantiation
> INDIRECT_BRANCH call %rdx
> ^
> entry.S:589:9: note: while in macro instantiation
>         INDIRECT_CALL %rdx
>         ^

Why is the same no problem with gas? It wants constant
expressions with .if too, after all.

Jan


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