Re: [PATCH] multifd: Be consistente about using uint64_t

[Philippe Mathieu-Daudé]

On 1/17/20 2:56 PM, Juan Quintela wrote:
> We transmit ram_addr_t always as uint64_t.  Be consistent in its
> use (on 64bit system, it is always uint64_t problem is 32bits).
>
> Signed-off-by: Juan Quintela <address@hidden>
> ---
>   migration/ram.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/migration/ram.c b/migration/ram.c
> index 96feb4062c..f7482b1b35 100644
> --- a/migration/ram.c
> +++ b/migration/ram.c
> @@ -803,7 +803,10 @@ static void multifd_send_fill_packet(MultiFDSendParams *p)
>       }
>   
>       for (i = 0; i < p->pages->used; i++) {
> -        packet->offset[i] = cpu_to_be64(p->pages->offset[i]);
> +        /* there are architectures where ram_addr_t is 32 bit */
> +        uint64_t temp = p->pages->offset[i];

Using a temp variable is clearer than a cast, good.

> +
> +        packet->offset[i] = cpu_to_be64(temp);
>       }
>   }
>   
> @@ -877,10 +880,10 @@ static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp)
>       }
>   
>       for (i = 0; i < p->pages->used; i++) {
> -        ram_addr_t offset = be64_to_cpu(packet->offset[i]);
> +        uint64_t offset = be64_to_cpu(packet->offset[i]);
>   
>           if (offset > (block->used_length - TARGET_PAGE_SIZE)) {
> -            error_setg(errp, "multifd: offset too long " RAM_ADDR_FMT
> +            error_setg(errp, "multifd: offset too long %" PRId64

Nitpick: PRIu64 for uint64_t.

Using PRIu64:
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

>                          " (max " RAM_ADDR_FMT ")",
>                          offset, block->max_length);
>               return -1;
> @@ -1236,7 +1239,7 @@ int multifd_save_setup(void)
>           p->id = i;
>           p->pages = multifd_pages_init(page_count);
>           p->packet_len = sizeof(MultiFDPacket_t)
> -                      + sizeof(ram_addr_t) * page_count;
> +                      + sizeof(uint64_t) * page_count;
>           p->packet = g_malloc0(p->packet_len);
>           p->packet->magic = cpu_to_be32(MULTIFD_MAGIC);
>           p->packet->version = cpu_to_be32(MULTIFD_VERSION);
> @@ -1447,7 +1450,7 @@ int multifd_load_setup(void)
>           p->id = i;
>           p->pages = multifd_pages_init(page_count);
>           p->packet_len = sizeof(MultiFDPacket_t)
> -                      + sizeof(ram_addr_t) * page_count;
> +                      + sizeof(uint64_t) * page_count;
>           p->packet = g_malloc0(p->packet_len);
>           p->name = g_strdup_printf("multifdrecv_%d", i);
>       }