linux-kernel - Re: [PATCH 1/3] iommu/fsl: Fix PAMU window size check.

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Message-ID: <20140704104430.GD13434@8bytes.org>
Date:	Fri, 4 Jul 2014 12:44:30 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Varun Sethi <Varun.Sethi@...escale.com>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, alex.williamson@...hat.com
Subject: Re: [PATCH 1/3] iommu/fsl: Fix PAMU window size check.

On Tue, Jun 24, 2014 at 07:27:15PM +0530, Varun Sethi wrote:
>  	/* window size is 2^(WSE+1) bytes */
> -	return __ffs(addrspace_size) - 1;
> +	return fls64(addrspace_size) - 2;

This looks bogus, why do you replace ffs (find-first-bit) by fls
(find-last-bit)?


	Joerg


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