linux-kernel - Re: [PATCH v2 02/12] ocxl: Change type of pasid to unsigned int

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Date:   Thu, 18 Jun 2020 08:37:47 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     Frederic Barrat <fbarrat@...ux.ibm.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Joerg Roedel <joro@...tes.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jacob Jun Pan <jacob.jun.pan@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sohil Mehta <sohil.mehta@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>, iommu@...ts.linux-foundation.org,
        amd-gfx <amd-gfx@...ts.freedesktop.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v2 02/12] ocxl: Change type of pasid to unsigned int

Hi, Frederic,

On Thu, Jun 18, 2020 at 10:05:19AM +0200, Frederic Barrat wrote:
> 
> 
> Le 13/06/2020 à 02:41, Fenghua Yu a écrit :
> >PASID is defined as "int" although it's a 20-bit value and shouldn't be
> >negative int. To be consistent with type defined in iommu, define PASID
> >as "unsigned int".
> 
> 
> It looks like this patch was considered because of the use of 'pasid' in
> variable or function names. The ocxl driver only makes sense on powerpc and
> shouldn't compile on anything else, so it's probably useless in the context
> of that series.
> The pasid here is defined by the opencapi specification
> (https://opencapi.org), it is borrowed from the PCI world and you could
> argue it could be an unsigned int. But then I think the patch doesn't go far
> enough. But considering it's not used on x86, I think this patch can be
> dropped.

The first 3 patches clean up pasid and flag defitions to prepare for
following patches.

If you think this patch can be dropped, we will drop it.

Thanks.

-Fenghua