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

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Date:   Tue, 14 Apr 2020 20:22:40 +0000
From:   "Moore, Robert" <robert.moore@...el.com>
To:     Jason Yan <yanaijie@...wei.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

I think we've discussed this in the past. ARRAY_SIZE is not standard, and will get in the way of portability:

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