[dpdk-dev] [PATCH v2 1/2] test/rcu: increase the size of num cores variable

[David Marchand]

On Fri, Jun 28, 2019 at 6:36 PM Honnappa Nagarahalli <
honnappa.nagarahalli at arm.com> wrote:

> num_cores is of type uint8_t. This results in the following
> compilation error.
>
> test_rcu_qsbr_perf.c:649:16: error: comparison is always false
> due to limited range of data type [-Werror=type-limits]
>   if (num_cores >= RTE_MAX_LCORE) {
>                 ^~
>
> RTE_MAX_LCORE is set to 256 for armv8 config.
>
> Fixes: e6a14121f4ae ("test/rcu: remove arbitrary limit on max core count")
> Cc: stable at dpdk.org
>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> ---
> v2
> - Changed type of num_cores to 'unsigned int' and
>   related changes (David/Thomas)
>
>  app/test/test_rcu_qsbr.c      |  8 ++++----
>  app/test/test_rcu_qsbr_perf.c | 16 ++++++++--------
>  2 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/app/test/test_rcu_qsbr.c b/app/test/test_rcu_qsbr.c
> index 943a1e370..ae359a987 100644
> --- a/app/test/test_rcu_qsbr.c
> +++ b/app/test/test_rcu_qsbr.c
> @@ -27,7 +27,7 @@
>  #define TEST_RCU_QSBR_CNT_INIT 1
>
>  uint16_t enabled_core_ids[RTE_MAX_LCORE];
> -uint8_t num_cores;
> +unsigned int num_cores;
>
>  static uint32_t *keys;
>  #define TOTAL_ENTRY (1024 * 8)
> @@ -389,7 +389,7 @@ test_rcu_qsbr_synchronize_reader(void *arg)
>  static int
>  test_rcu_qsbr_synchronize(void)
>  {
> -       int i;
> +       unsigned int i;
>
>         printf("\nTest rte_rcu_qsbr_synchronize()\n");
>
> @@ -890,8 +890,8 @@ test_rcu_qsbr_sw_sv_3qs(void)
>  static int
>  test_rcu_qsbr_mw_mv_mqs(void)
>  {
> -       int i, j;
> -       uint8_t test_cores;
> +       unsigned int i, j;
> +       unsigned int test_cores;
>
>         writer_done = 0;
>         test_cores = num_cores / 4;
> diff --git a/app/test/test_rcu_qsbr_perf.c b/app/test/test_rcu_qsbr_perf.c
> index 363365f46..a085db852 100644
> --- a/app/test/test_rcu_qsbr_perf.c
> +++ b/app/test/test_rcu_qsbr_perf.c
> @@ -17,7 +17,7 @@
>
>  /* Check condition and return an error if true. */
>  static uint16_t enabled_core_ids[RTE_MAX_LCORE];
> -static uint8_t num_cores;
> +static unsigned int num_cores;
>
>  static uint32_t *keys;
>  #define TOTAL_ENTRY (1024 * 8)
> @@ -125,8 +125,8 @@ test_rcu_qsbr_writer_perf(void *arg)
>  static int
>  test_rcu_qsbr_perf(void)
>  {
> -       int i, sz;
> -       int tmp_num_cores;
> +       unsigned int i, sz;
>

sz is supposed to be a size_t.


+       unsigned int tmp_num_cores;
>
>         writer_done = 0;
>
> @@ -188,8 +188,8 @@ test_rcu_qsbr_perf(void)
>  static int
>  test_rcu_qsbr_rperf(void)
>  {
> -       int i, sz;
> -       int tmp_num_cores;
> +       unsigned int i, sz;
>

Idem.


+       unsigned int tmp_num_cores;
>
>         rte_atomic64_clear(&updates);
>         rte_atomic64_clear(&update_cycles);
> @@ -234,7 +234,7 @@ test_rcu_qsbr_rperf(void)
>  static int
>  test_rcu_qsbr_wperf(void)
>  {
> -       int i, sz;
> +       unsigned int i, sz;
>
>         rte_atomic64_clear(&checks);
>         rte_atomic64_clear(&check_cycles);
> @@ -378,7 +378,7 @@ static int
>  test_rcu_qsbr_sw_sv_1qs(void)
>  {
>         uint64_t token, begin, cycles;
> -       int i, j, tmp_num_cores, sz;
> +       unsigned int i, j, tmp_num_cores, sz;
>         int32_t pos;
>
>         writer_done = 0;
> @@ -496,7 +496,7 @@ static int
>  test_rcu_qsbr_sw_sv_1qs_non_blocking(void)
>  {
>         uint64_t token, begin, cycles;
> -       int i, j, ret, tmp_num_cores, sz;
> +       unsigned int i, j, ret, tmp_num_cores, sz;
>

Idem.
ret is an int.


        int32_t pos;
>
>         writer_done = 0;
> --
> 2.17.1
>
>
Let's focus on just the issue we want to fix and drop the changes on sz and
ret.

If you send a follow up patch on the issues for sz and ret, please also
consider changing enabled_core_ids as an unsigned int array.
Thanks.

-- 
David Marchand