linux-kernel - Re: [PATCH v4 2/8] init.h: add __read_mostly to early_param_on

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Date:	Thu, 30 Apr 2015 20:42:32 +0200
From:	Borislav Petkov <bp@...e.de>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	Kyle McMartin <kyle@...nel.org>, Christoph Lameter <cl@...ux.com>,
	Alok N Kataria <alokk@...softinc.com>,
	Shobhit Dayal <shobhit@...softinc.com>,
	Shai Fultheim <shai@...lex86.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, plagnioj@...osoft.com,
	tomi.valkeinen@...com, daniel.vetter@...el.com, airlied@...ux.ie,
	dledford@...hat.com, awalls@...metrocast.net, syrjala@....fi,
	luto@...capital.net, mst@...hat.com, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org, Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org
Subject: Re: [PATCH v4 2/8] init.h: add __read_mostly to early_param_on_off()

On Thu, Apr 30, 2015 at 08:32:00PM +0200, Luis R. Rodriguez wrote:
> In this particular case early_param_on_off() will be used for boot
> time kernel parameters which we do not intend on dynamically change a
> lot at run time, we

It is not about whether you're going to dynamically change it but more
about how often it is accessed. If it is accessed only a couple of times
tops during boot and then never again during the system lifetime - which
is generally the case for most boot params - then you certainly don't
want to pollute the read.mostly section with dead weight. You can just
as well use a stinking normal variable.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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