Re: [Xen-devel] [PATCH 3/5] x86/hvm: Adjust hvmemul_rep_stos() to compile with -Wvla

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.09.18 at 15:00, <andrew.cooper3@xxxxxxxxxx> wrote:
> For at least "gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609", the
> typecast of buf triggers a Variable Length Array warning.
> 
> Alter the asm expression to avoid the typecast, which necessitates the
> introduction of a memory clobber as the compiler can no longer identify
> the total quantity of written memory.

I dislike this, but what do you do. Would be quite helpful though to
have a comment there, or else I might be tempted to undo the
memory clobber in a couple of months/years time.

Jan



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