Re: [Qemu-devel] [PATCH v4 6/7] vl.c: Rename MAX_CPUMASK_BITS to MAX_CPUS

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

On Fri, Mar 14, 2014 at 04:33:55PM -0300, Eduardo Habkost wrote:
> Also, document what the macro is really useful for.
> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>


This breaks full build:

CC    hw/ide/macio.o
In file included from hw/ide/macio.c:26:0:
./hw/ppc/mac.h:34:0: error: "MAX_CPUS" redefined [-Werror]
 #define MAX_CPUS 1
 ^
In file included from ./hw/ide/internal.h:12:0,
                 from ./hw/ppc/mac.h:30,
                 from hw/ide/macio.c:26:
/scm/qemu/include/sysemu/sysemu.h:142:0: note: this is the location of
the previous definition
 #define MAX_CPUS 255
 ^
cc1: all warnings being treated as errors
make: *** [hw/ide/macio.o] Error 1

> ---
> Changes v3 -> v4:
>   * s/should/shall/ at the MAX_CPUS comment
> ---
>  include/sysemu/sysemu.h |  9 ++++++++-
>  vl.c                    | 10 +++++-----
>  2 files changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
> index b90df9a..6bc1a85 100644
> --- a/include/sysemu/sysemu.h
> +++ b/include/sysemu/sysemu.h
> @@ -133,7 +133,14 @@ extern uint8_t qemu_extra_params_fw[2];
>  extern QEMUClockType rtc_clock;
>  
>  #define MAX_NODES 64
> -#define MAX_CPUMASK_BITS 255
> +
> +/* The following shall be true for all CPUs:
> + *   cpu->cpu_index < max_cpus <= MAX_CPUS
> + *
> + * Note that cpu->get_arch_id() may be larger than MAX_CPUS.
> + */
> +#define MAX_CPUS 255
> +
>  extern int nb_numa_nodes;
>  extern uint64_t node_mem[MAX_NODES];
>  extern unsigned long *node_cpumask[MAX_NODES];
> diff --git a/vl.c b/vl.c
> index bca5c95..64b38a5 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1278,11 +1278,11 @@ static void numa_node_parse_cpus(int nodenr, const char *cpus)
>          goto error;
>      }
>  
> -    if (endvalue >= MAX_CPUMASK_BITS) {
> -        endvalue = MAX_CPUMASK_BITS - 1;
> +    if (endvalue >= MAX_CPUS) {
> +        endvalue = MAX_CPUS - 1;
>          fprintf(stderr,
>              "qemu: NUMA: A max of %d VCPUs are supported\n",
> -             MAX_CPUMASK_BITS);
> +             MAX_CPUS);
>      }
>  
>      if (endvalue < value) {
> @@ -2954,7 +2954,7 @@ int main(int argc, char **argv, char **envp)
>  
>      for (i = 0; i < MAX_NODES; i++) {
>          node_mem[i] = 0;
> -        node_cpumask[i] = bitmap_new(MAX_CPUMASK_BITS);
> +        node_cpumask[i] = bitmap_new(MAX_CPUS);
>      }
>  
>      nb_numa_nodes = 0;
> @@ -4245,7 +4245,7 @@ int main(int argc, char **argv, char **envp)
>          }
>  
>          for (i = 0; i < nb_numa_nodes; i++) {
> -            if (!bitmap_empty(node_cpumask[i], MAX_CPUMASK_BITS)) {
> +            if (!bitmap_empty(node_cpumask[i], MAX_CPUS)) {
>                  break;
>              }
>          }
> -- 
> 1.8.5.3