linux-kernel - Re: [RFC 3/5] drivers: boot_constraint: Add boot_constraints

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Message-ID: <04d6732a-3a2e-2f04-1d6e-a4ac51470db5@infradead.org>
Date:   Wed, 28 Jun 2017 08:51:10 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Rafael Wysocki <rjw@...ysocki.net>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Mark Brown <broonie@...nel.org>,
        Shiraz Hashim <shashim@...eaurora.org>,
        Rob Herring <robh@...nel.org>, rnayak@...eaurora.org,
        linux-doc@...r.kernel.org
Subject: Re: [RFC 3/5] drivers: boot_constraint: Add boot_constraints_disable
 kernel parameter

On 06/28/2017 03:26 AM, Viresh Kumar wrote:
> Users must be given an option to discard any constraints set by
> bootloaders. For example, consider that a constraint is set for the LCD
> controller's supply and the LCD driver isn't loaded by the kernel. If
> the user doesn't need to use the LCD device, then he shouldn't be forced
> to honour the constraint.
> 
> We can also think about finer control of such constraints with help of
> some sysfs files, but a kernel parameter is fine to begin with.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  Documentation/admin-guide/kernel-parameters.txt |  2 ++
>  drivers/base/boot_constraint.c                  | 17 +++++++++++++++++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 7737ab5d04b2..35e8a298bfc1 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -426,6 +426,8 @@
>  			embedded devices based on command line input.
>  			See Documentation/block/cmdline-partition.txt
>  
> +	boot_constraints_disable = Do not set any boot constraints for devices.
> +

No '=' sign.  That is only used when there is a following parameter value.


>  	boot_delay=	Milliseconds to delay each printk during boot.
>  			Values larger than 10 seconds (10000) are changed to
>  			no delay (0).


-- 
~Randy