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Date:   Fri, 1 Jul 2022 12:31:42 +0100
From:   Will Deacon <will@kernel.org>
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH v1 1/1] drivers/perf: thunderx2_pmu: Replace open coded
 acpi_match_device()
Message-ID: <20220701113141.GB28070@willie-the-truck>
References: <20220630195103.4088-1-andriy.shevchenko@linux.intel.com>
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On Thu, Jun 30, 2022 at 10:51:03PM +0300, Andy Shevchenko wrote:
> Replace open coded acpi_match_device() in get_tx2_pmu_type().
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
>  drivers/perf/thunderx2_pmu.c | 19 +++++++------------
>  1 file changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
> index 1edb9c03704f..b5a70cc42495 100644
> --- a/drivers/perf/thunderx2_pmu.c
> +++ b/drivers/perf/thunderx2_pmu.c
> @@ -504,24 +504,19 @@ static void tx2_uncore_event_update(struct perf_event *event)
>  
>  static enum tx2_uncore_type get_tx2_pmu_type(struct acpi_device *adev)
>  {
> -	int i = 0;
> -	struct acpi_tx2_pmu_device {
> -		__u8 id[ACPI_ID_LEN];
> -		enum tx2_uncore_type type;
> -	} devices[] = {
> +	struct acpi_device_id devices[] = {
>  		{"CAV901D", PMU_TYPE_L3C},
>  		{"CAV901F", PMU_TYPE_DMC},
>  		{"CAV901E", PMU_TYPE_CCPI2},
> -		{"", PMU_TYPE_INVALID}
> +		{}
>  	};
> +	const struct acpi_device_id *id;
>  
> -	while (devices[i].type != PMU_TYPE_INVALID) {
> -		if (!strcmp(acpi_device_hid(adev), devices[i].id))
> -			break;
> -		i++;
> -	}
> +	id = acpi_match_device(adev, devices);
> +	if (!id)
> +		return PMU_TYPE_INVALID;
>  
> -	return devices[i].type;
> +	return (enum tx2_uncore_type)id->driver_data;

This doesn't even build for me:

 | drivers/perf/thunderx2_pmu.c:515:25: error: incompatible pointer types passing 'struct acpi_device *' to parameter of type 'const struct acpi_device_id *' [-Werror,-Wincompatible-pointer-types]
 |         id = acpi_match_device(adev, devices);
 |                                ^~~~
 | ./include/linux/acpi.h:713:77: note: passing argument to parameter 'ids' here
 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 |                                                                             ^
 | drivers/perf/thunderx2_pmu.c:515:31: error: incompatible pointer types passing 'struct acpi_device_id [4]' to parameter of type 'const struct device *' [-Werror,-Wincompatible-pointer-types]
 |         id = acpi_match_device(adev, devices);
 |                                      ^~~~~~~
 | ./include/linux/acpi.h:714:34: note: passing argument to parameter 'dev' here
 |                                                const struct device *dev);
 |                                                                     ^
 | 2 errors generated.
 | make[2]: *** [scripts/Makefile.build:249: drivers/perf/thunderx2_pmu.o] Error 1
 | make[2]: *** Waiting for unfinished jobs....
 | make[1]: *** [scripts/Makefile.build:466: drivers/perf] Error 2
 | make[1]: *** Waiting for unfinished jobs....
 | make: *** [Makefile:1843: drivers] Error 2
 |

Have you tested this at all?

Will