linux-kernel - Re: [PATCH] ACPI: remove redundant 'default n' from Kconfig

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Date:   Tue, 16 Oct 2018 11:06:55 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: remove redundant 'default n' from Kconfig

On Wednesday, October 10, 2018 4:41:30 PM CEST Bartlomiej Zolnierkiewicz wrote:
> 'default n' is the default value for any bool or tristate Kconfig
> setting so there is no need to write it explicitly.
> 
> Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO
> is not set' for visible symbols") the Kconfig behavior is the same
> regardless of 'default n' being present or not:
> 
>     ...
>     One side effect of (and the main motivation for) this change is making
>     the following two definitions behave exactly the same:
>     
>         config FOO
>                 bool
>     
>         config FOO
>                 bool
>                 default n
>     
>     With this change, neither of these will generate a
>     '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
>     That might make it clearer to people that a bare 'default n' is
>     redundant.
>     ...
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  drivers/acpi/Kconfig |    6 ------
>  1 file changed, 6 deletions(-)
> 
> Index: b/drivers/acpi/Kconfig
> ===================================================================
> --- a/drivers/acpi/Kconfig	2018-09-26 15:54:31.942819766 +0200
> +++ b/drivers/acpi/Kconfig	2018-10-10 16:38:09.691897907 +0200
> @@ -138,7 +138,6 @@ config ACPI_REV_OVERRIDE_POSSIBLE
>  
>  config ACPI_EC_DEBUGFS
>  	tristate "EC read/write access through /sys/kernel/debug/ec"
> -	default n
>  	help
>  	  Say N to disable Embedded Controller /sys/kernel/debug interface
>  
> @@ -283,7 +282,6 @@ config ACPI_PROCESSOR
>  config ACPI_IPMI
>  	tristate "IPMI"
>  	depends on IPMI_HANDLER
> -	default n
>  	help
>  	  This driver enables the ACPI to access the BMC controller. And it
>  	  uses the IPMI request/response message to communicate with BMC
> @@ -361,7 +359,6 @@ config ACPI_TABLE_UPGRADE
>  
>  config ACPI_DEBUG
>  	bool "Debug Statements"
> -	default n
>  	help
>  	  The ACPI subsystem can produce debug output.  Saying Y enables this
>  	  output and increases the kernel size by around 50K.
> @@ -374,7 +371,6 @@ config ACPI_DEBUG
>  config ACPI_PCI_SLOT
>  	bool "PCI slot detection driver"
>  	depends on SYSFS
> -	default n
>  	help
>  	  This driver creates entries in /sys/bus/pci/slots/ for all PCI
>  	  slots in the system.  This can help correlate PCI bus addresses,
> @@ -436,7 +432,6 @@ config ACPI_HED
>  config ACPI_CUSTOM_METHOD
>  	tristate "Allow ACPI methods to be inserted/replaced at run time"
>  	depends on DEBUG_FS
> -	default n
>  	help
>  	  This debug facility allows ACPI AML methods to be inserted and/or
>  	  replaced without rebooting the system. For details refer to:
> @@ -481,7 +476,6 @@ config ACPI_EXTLOG
>  	tristate "Extended Error Log support"
>  	depends on X86_MCE && X86_LOCAL_APIC && EDAC
>  	select UEFI_CPER
> -	default n
>  	help
>  	  Certain usages such as Predictive Failure Analysis (PFA) require
>  	  more information about the error than what can be described in
> 

Applied, thanks!