On Thu, Jul 07, 2016 at 02:49:08PM +0100, Ferruh Yigit wrote:
> This is for target i686-native-linuxapp-gcc and gcc6,
>
> Compilation error is:
> == Build drivers/net/virtio
> CC virtio_rxtx_simple.o
> In file included from
> .../build/include/rte_mempool.h:77:0,
> from
> .../drivers/net/virtio/virtio_rxtx_simple.c:46:
> .../drivers/net/virtio/virtio_rxtx_simple.c: In
> function ?virtio_xmit_pkts_simple?:
> .../build/include/rte_memcpy.h:551:2: error: array
> subscript is above array bounds [-Werror=array-bounds]
> rte_mov16((uint8_t *)dst + 1 * 16, (const uint8_t *)src + 1 * 16);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
...
>
> The compiler traces the array all through the call stack and knows the
> size of array is 128 and generates a warning on above [1] which tries to
> access beyond byte 128.
> But unfortunately it ignores the "(size > 256)" check.
>
> Giving a hint to compiler that variable "size" is related to the size of
> the source buffer fixes compiler warning.
>
> Fixes: 863bfb474493 ("mempool: optimize copy in cache")
>
> Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
Applied to dpdk-next-virtio.
Thanks.
--yliu
