linux-kernel - RE: [PATCH] trivial: remove ACPI_ARRAY

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Date:	Mon, 2 Nov 2009 13:35:33 -0800
From:	"Moore, Robert" <robert.moore@...el.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>,
	Thiago Farina <tfransosi@...il.com>
CC:	"trivial@...nel.org" <trivial@...nel.org>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"Lin, Ming M" <ming.m.lin@...el.com>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] trivial: remove ACPI_ARRAY_LENGTH macro.

I seem to remember that Len Brown had some text like this.


>-----Original Message-----
>From: Bjorn Helgaas [mailto:bjorn.helgaas@...com]
>Sent: Monday, November 02, 2009 8:50 AM
>To: Thiago Farina
>Cc: trivial@...nel.org; lenb@...nel.org; Lin, Ming M; Moore, Robert;
>jkosina@...e.cz; linux-acpi@...r.kernel.org; linux-kernel@...r.kernel.org
>Subject: Re: [PATCH] trivial: remove ACPI_ARRAY_LENGTH macro.
>
>On Sunday 01 November 2009 03:36:12 pm Thiago Farina wrote:
>> Since the kernel already has a macro (ARRAY_SIZE) that does the same
>thing,
>> just use it instead of defining another macro for the same propose.
>
>This changes the ACPICA, which is used in several OSes besides Linux.
>The CA is designed to have a small, controlled interface to the host OS.
>This patch would expand that interface, which would work fine on Linux,
>but would cause problems on other OSes that don't provide ARRAY_SIZE().
>
>It'd be nice to have a little text in Documentation/acpi/ that covered
>issues like this.  It could also talk about the special licensing
>requirements for ACPICA changes.  And MAINTAINERS could mention it for
>the path prefix "drivers/acpi/acpica/".
>
>Bjorn
>
>>  drivers/acpi/acpica/hwvalid.c |    2 +-
>>  drivers/acpi/acpica/uteval.c  |    4 ++--
>>  include/acpi/actypes.h        |    4 ----
>>  3 files changed, 3 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/acpi/acpica/hwvalid.c
>b/drivers/acpi/acpica/hwvalid.c
>> index ec33f27..ca2eb02 100644
>> --- a/drivers/acpi/acpica/hwvalid.c
>> +++ b/drivers/acpi/acpica/hwvalid.c
>> @@ -103,7 +103,7 @@ static const struct acpi_port_info
>acpi_protected_ports[] = {
>>  	{"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
>>  };
>>
>> -#define ACPI_PORT_INFO_ENTRIES  ACPI_ARRAY_LENGTH (acpi_protected_ports)
>> +#define ACPI_PORT_INFO_ENTRIES  ARRAY_SIZE(acpi_protected_ports)
>>
>>
>/**************************************************************************
>****
>>   *
>> diff --git a/drivers/acpi/acpica/uteval.c b/drivers/acpi/acpica/uteval.c
>> index 5d54e36..54efbaa 100644
>> --- a/drivers/acpi/acpica/uteval.c
>> +++ b/drivers/acpi/acpica/uteval.c
>> @@ -126,7 +126,7 @@ acpi_status acpi_ut_osi_implementation(struct
>acpi_walk_state *walk_state)
>>
>>  	/* Compare input string to static table of supported interfaces */
>>
>> -	for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
>> +	for (i = 0; i < ARRAY_SIZE(acpi_interfaces_supported); i++) {
>>  		if (!ACPI_STRCMP(string_desc->string.pointer,
>>  				 acpi_interfaces_supported[i].name)) {
>>  			/*
>> @@ -186,7 +186,7 @@ acpi_status acpi_osi_invalidate(char *interface)
>>  {
>>  	int i;
>>
>> -	for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
>> +	for (i = 0; i < ARRAY_SIZE(acpi_interfaces_supported); i++) {
>>  		if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i].name))
>{
>>  			*acpi_interfaces_supported[i].name = '\0';
>>  			return AE_OK;
>> diff --git a/include/acpi/actypes.h b/include/acpi/actypes.h
>> index 153f12d..641d746 100644
>> --- a/include/acpi/actypes.h
>> +++ b/include/acpi/actypes.h
>> @@ -441,10 +441,6 @@ typedef unsigned long long acpi_integer;
>>  #define ACPI_MIN(a,b)                   (((a)<(b))?(a):(b))
>>  #define ACPI_MAX(a,b)                   (((a)>(b))?(a):(b))
>>
>> -/* Size calculation */
>> -
>> -#define ACPI_ARRAY_LENGTH(x)            (sizeof(x) / sizeof((x)[0]))
>> -
>>  /* Pointer manipulation */
>>
>>  #define ACPI_CAST_PTR(t, p)             ((t *) (acpi_uintptr_t) (p))
>

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