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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150728163536.GS25159@twins.programming.kicks-ass.net>
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;
> +}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/