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.mayd...@linaro.org>
Reviewed-by: Michael S. Tsirkin <m...@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
>
