linux-kernel - Re: [PATCH v7 3/4] perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver

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Date:	Sat, 9 Jul 2016 20:00:42 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Tai Nguyen <ttnguyen@....com>
Cc:	mark.rutland@....com, will.deacon@....com, catalin.marinas@....com,
	LKML <linux-kernel@...r.kernel.org>, devicetree@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, patches@....com
Subject: Re: [PATCH v7 3/4] perf: xgene: Add APM X-Gene SoC Performance
 Monitoring Unit driver

On Wed, Jul 6, 2016 at 8:07 PM, Tai Nguyen <ttnguyen@....com> wrote:
> Signed-off-by: Tai Nguyen <ttnguyen@....com>
> ---
>  Documentation/perf/xgene-pmu.txt |   48 ++
>  drivers/perf/Kconfig             |    7 +
>  drivers/perf/Makefile            |    1 +
>  drivers/perf/xgene_pmu.c         | 1398 ++++++++++++++++++++++++++++++++++++++
>  4 files changed, 1454 insertions(+)
>  create mode 100644 Documentation/perf/xgene-pmu.txt
>  create mode 100644 drivers/perf/xgene_pmu.c
>

[...]

> diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
> index 04e2653..4d5c5f9 100644
> --- a/drivers/perf/Kconfig
> +++ b/drivers/perf/Kconfig
> @@ -12,4 +12,11 @@ config ARM_PMU
>           Say y if you want to use CPU performance monitors on ARM-based
>           systems.
>
> +config XGENE_PMU
> +        depends on PERF_EVENTS && ARCH_XGENE
> +        bool "APM X-Gene SoC PMU"

If the driver is bool, then please avoid using module.h and anything from
within it.  They are either no-ops when built in, or there are non-modular
equivalents available, so it is entirely avoidable, and makes for smaller
and better code.

> +        default n
> +        help
> +          Say y if you want to use APM X-Gene SoC performance monitors.
> +
>  endmenu
> diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile
> index acd2397..b116e98 100644
> --- a/drivers/perf/Makefile
> +++ b/drivers/perf/Makefile
> @@ -1 +1,2 @@
>  obj-$(CONFIG_ARM_PMU) += arm_pmu.o
> +obj-$(CONFIG_XGENE_PMU) += xgene_pmu.o

[...]
                    ver = {
> +               .name           = "xgene-pmu",
> +               .of_match_table = xgene_pmu_of_match,
> +               .acpi_match_table = ACPI_PTR(xgene_pmu_acpi_match),
> +       },
> +};
> +
> +module_platform_driver(xgene_pmu_driver);

builtin_platform_driver

> +
> +MODULE_DESCRIPTION("APM X-Gene SoC PMU driver");
> +MODULE_AUTHOR("Hoan Tran <hotran@....com>");
> +MODULE_AUTHOR("Tai Nguyen <ttnguyen@....com>");
> +MODULE_LICENSE("GPL");

As long as this information is at the top of the file, then these can
go away too -- just like MODULE_DEVICE_TABLE they are no-op.

Paul.