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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Sep 24, 2018 at 02:00:01PM +0100, Andrew Cooper 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.
> 
> Despite the memory clobber, there is no change to the generated.

generated assembly code?

> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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