Re: [Xen-devel] [PATCH][V2] x86/xen: clean up clang build warning

[Juergen Gross <jgross@xxxxxxxx>]

On 18/09/17 11:03, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> 
> In the case where sizeof(maddr) != sizeof(long) p is initialized and
> never read and clang throws a warning on this.  Move declaration of
> p to clean up the clang build warning:
> 
> warning: Value stored to 'p' during its initialization is never read
> 
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

> ---
>  arch/x86/include/asm/xen/hypercall.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/xen/hypercall.h 
> b/arch/x86/include/asm/xen/hypercall.h
> index 9606688caa4b..5ff77cb2529e 100644
> --- a/arch/x86/include/asm/xen/hypercall.h
> +++ b/arch/x86/include/asm/xen/hypercall.h
> @@ -552,13 +552,13 @@ static inline void
>  MULTI_update_descriptor(struct multicall_entry *mcl, u64 maddr,
>                       struct desc_struct desc)
>  {
> -     u32 *p = (u32 *) &desc;
> -
>       mcl->op = __HYPERVISOR_update_descriptor;
>       if (sizeof(maddr) == sizeof(long)) {
>               mcl->args[0] = maddr;
>               mcl->args[1] = *(unsigned long *)&desc;
>       } else {
> +             u32 *p = (u32 *)&desc;
> +
>               mcl->args[0] = maddr;
>               mcl->args[1] = maddr >> 32;
>               mcl->args[2] = *p++;
> 


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