linux-kernel - Re: [PATCH 04/14] x86: use generic swiotlb

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Date:   Thu, 15 Mar 2018 12:54:26 +0100
From:   Christoph Hellwig <hch@....de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Christoph Hellwig <hch@....de>, x86@...nel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Muli Ben-Yehuda <mulix@...ix.org>,
        Jon Mason <jdmason@...zu.us>, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/14] x86: use generic swiotlb_ops

On Thu, Mar 15, 2018 at 10:00:57AM +0100, Thomas Gleixner wrote:
> On Wed, 14 Mar 2018, Christoph Hellwig wrote:
> >  #if defined(CONFIG_INTEL_IOMMU) || defined(CONFIG_AMD_IOMMU)
> >  	void *iommu; /* hook for IOMMU specific extension */
> >  #endif
> > +#ifdef CONFIG_STA2X11
> > +	bool is_sta2x11 : 1;
> 
> Huch? Please use either bool or an unsigned int based bitfield. A boolean
> bitfield doesn't make sense.

bool bitfields are perfectly valid in C99 and used in various places in
the kernel. But if you want either bool or an unsigned bitfield let me
know and I'll switch it over.