linux-kernel - Re: [PATCH] ACPICA: Use ARRAY_SIZE instead of hardcoded siz

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Date:   Wed, 15 Apr 2020 11:13:55 +0800
From:   Jason Yan <yanaijie@...wei.com>
To:     "Moore, Robert" <robert.moore@...el.com>,
        "Kaneda, Erik" <erik.kaneda@...el.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "devel@...ica.org" <devel@...ica.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPICA: Use ARRAY_SIZE instead of hardcoded siz



在 2020/4/15 4:22, Moore, Robert 写道:
> I think we've discussed this in the past. ARRAY_SIZE is not standard, and will get in the way of portability:
> 

Thanks for the explanation. Got it.


> On gcc v7.4.0:
> ../../../source/components/resources/rsdumpinfo.c:335:25: note: in expansion of macro 'ACPI_RSD_TABLE_SIZE'
>       {ACPI_RSD_TITLE,    ACPI_RSD_TABLE_SIZE (AcpiRsDumpGenericReg),         "Generic Register",         NULL},
> 
> ../../../source/components/resources/rsdumpinfo.c:166:37: error: initializer element is not constant
>   #define ACPI_RSD_TABLE_SIZE(name)   ARRAY_SIZE (name)
> 
> 
> And, on MSVC 2017:
> Severity	Code	Description	Project	File	Line	Suppression State
> Warning	C4013	'ARRAY_SIZE' undefined; assuming extern returning int	AcpiExec	c:\acpica\source\components\resources\rsdumpinfo.c	179	
> -----Original Message-----
> From: Jason Yan <yanaijie@...wei.com>
> Sent: Monday, April 13, 2020 7:32 AM
> To: Moore, Robert <robert.moore@...el.com>; Kaneda, Erik <erik.kaneda@...el.com>; Wysocki, Rafael J <rafael.j.wysocki@...el.com>; lenb@...nel.org; linux-acpi@...r.kernel.org; devel@...ica.org; linux-kernel@...r.kernel.org
> Cc: Jason Yan <yanaijie@...wei.com>
> Subject: [PATCH] ACPICA: Use ARRAY_SIZE instead of hardcoded siz
> 
> Fix the following coccicheck warning:
> 
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> ./drivers/acpi/acpica/rsdumpinfo.c:18:48-49: WARNING: Use ARRAY_SIZE
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> ---
>   drivers/acpi/acpica/rsdumpinfo.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/acpica/rsdumpinfo.c b/drivers/acpi/acpica/rsdumpinfo.c
> index cafa8134b4c6..f1ba4cd8080f 100644
> --- a/drivers/acpi/acpica/rsdumpinfo.c
> +++ b/drivers/acpi/acpica/rsdumpinfo.c
> @@ -15,7 +15,7 @@ ACPI_MODULE_NAME("rsdumpinfo")  #if defined(ACPI_DEBUG_OUTPUT) || defined(ACPI_DISASSEMBLER) || defined(ACPI_DEBUGGER)
>   #define ACPI_RSD_OFFSET(f)          (u8) ACPI_OFFSET (union acpi_resource_data,f)
>   #define ACPI_PRT_OFFSET(f)          (u8) ACPI_OFFSET (struct acpi_pci_routing_table,f)
> -#define ACPI_RSD_TABLE_SIZE(name)   (sizeof(name) / sizeof (struct acpi_rsdump_info))
> +#define ACPI_RSD_TABLE_SIZE(name)   ARRAY_SIZE(name)
>   /*******************************************************************************
>    *
>    * Resource Descriptor info tables
> --
> 2.21.1
> 
> 
> .
>