linux-kernel - Re: [PATCH v2 3/9] bitops: Introduce a more generic BITMASK macro

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Date:	Thu, 17 Oct 2013 10:40:14 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Joe Perches <joe@...ches.com>
Cc:	Chen Gong <gong.chen@...ux.intel.com>, tony.luck@...el.com,
	naveen.n.rao@...ux.vnet.ibm.com, m.chehab@...sung.com,
	arozansk@...hat.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Winischhofer <thomas@...ischhofer.net>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH v2 3/9] bitops: Introduce a more generic BITMASK macro

On Thu, Oct 17, 2013 at 01:32:30AM -0700, Joe Perches wrote:
> On Thu, 2013-10-17 at 03:38 -0400, Chen Gong wrote:
> > the point is we can use GENMASK like GENMASK(end_bit, start_bit) but
> > we don't know the value of end_bit/start_bit at compile-time.
> 
> True.
> 
> The BUILD_BUG_ON idea is just to avoid people using
> 	GENMASK(1, 2)

They'll notice the 0 pretty quickly when they test their code.

Let's add those checks only when it is really necessary and people have
actually made that mistake repeatedly.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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