[PATCH] drivers/perf: arm_pmu: Show PMU version on boot

[Will Deacon]

On Thu, Jul 30, 2020 at 06:47:21PM +0800, Shaokun Zhang wrote:
> The @pmuver field has been initialized and can tell the PMU version.
> Let's show it on boot and the user obtains this information directly.
> 
> Cc: Will Deacon <will at kernel.org>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Signed-off-by: Shaokun Zhang <zhangshaokun at hisilicon.com>
> ---
>  drivers/perf/arm_pmu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
> index df352b334ea7..36f7fad7ba5a 100644
> --- a/drivers/perf/arm_pmu.c
> +++ b/drivers/perf/arm_pmu.c
> @@ -870,8 +870,8 @@ int armpmu_register(struct arm_pmu *pmu)
>  	if (!__oprofile_cpu_pmu)
>  		__oprofile_cpu_pmu = pmu;
>  
> -	pr_info("enabled with %s PMU driver, %d counters available\n",
> -		pmu->name, pmu->num_events);
> +	pr_info("enabled with %s PMU driver, %d counters available, version is %d\n",
> +		pmu->name, pmu->num_events, pmu->pmuver);

Hmm. I'm suspicious about this. Who is using this, and what for? We're
better off exposing things in the existing sysfs directory we have if it's
actually needed by tools.

Will