linux-kernel - Re: [PATCH 6/9] x86/intel_rdt: Add support for cache bit mask management

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Date:	Tue, 28 Jul 2015 18:35:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, tj@...nel.org, matt.fleming@...el.com,
	will.auld@...el.com, glenn.p.williamson@...el.com,
	kanaka.d.juvva@...el.com
Subject: Re: [PATCH 6/9] x86/intel_rdt: Add support for cache bit mask
 management

On Wed, Jul 01, 2015 at 03:21:07PM -0700, Vikas Shivappa wrote:
> +static inline bool cbm_is_contiguous(unsigned long var)
> +{
> +	unsigned long maxcbm = MAX_CBM_LENGTH;
> +	unsigned long first_bit, zero_bit;
> +
> +	if (!var)
> +		return false;
> +
> +	first_bit = find_next_bit(&var, maxcbm, 0);

We actually have: find_first_bit().

> +	zero_bit = find_next_zero_bit(&var, maxcbm, first_bit);
> +
> +	if (find_next_bit(&var, maxcbm, zero_bit) < maxcbm)
> +		return false;
> +
> +	return true;
> +}
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