Re: [Qemu-devel] [PATCH 02/12] hw/intc/apic.c: Use uint32_t for mask word in foreach_apic

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Mar 10, 2014 at 07:10:38PM +0000, Peter Maydell wrote:
> Use unsigned arithmetic for operations on the mask word
> in the foreach_apic() macro, to avoid relying on undefined
> behaviour when shifting into the sign bit.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/intc/apic.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/intc/apic.c b/hw/intc/apic.c
> index 361ae90..e137882 100644
> --- a/hw/intc/apic.c
> +++ b/hw/intc/apic.c
> @@ -201,12 +201,13 @@ static void apic_external_nmi(APICCommonState *s)
>  
>  #define foreach_apic(apic, deliver_bitmask, code) \
>  {\
> -    int __i, __j, __mask;\
> +    int __i, __j;\
> +    uint32_t __mask;\
>      for(__i = 0; __i < MAX_APIC_WORDS; __i++) {\
>          __mask = deliver_bitmask[__i];\
>          if (__mask) {\
>              for(__j = 0; __j < 32; __j++) {\
> -                if (__mask & (1 << __j)) {\
> +                if (__mask & (1U << __j)) {\
>                      apic = local_apics[__i * 32 + __j];\
>                      if (apic) {\
>                          code;\
> -- 
> 1.9.0
>