linux-kernel - RE: [PATCH v3] staging: fsl-mc: use 32bits to support 64K size mc-portals

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Message-ID: <AM5PR0401MB2545B2636B0CDE3AFB838E7C9A260@AM5PR0401MB2545.eurprd04.prod.outlook.com>
Date:   Fri, 24 Nov 2017 16:00:42 +0000
From:   Bharat Bhushan <bharat.bhushan@....com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Laurentiu Tudor <laurentiu.tudor@....com>
CC:     Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Roy Pledge <roy.pledge@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Leo Li <leoyang.li@....com>,
        Bogdan Purcareata <bogdan.purcareata@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v3] staging: fsl-mc: use 32bits to support 64K size
 mc-portals

Hi Greg,

> -----Original Message-----
> From: gregkh@...uxfoundation.org [mailto:gregkh@...uxfoundation.org]
> Sent: Friday, November 24, 2017 9:29 PM
> To: Laurentiu Tudor <laurentiu.tudor@....com>
> Cc: Bharat Bhushan <bharat.bhushan@....com>; Ruxandra Ioana Radulescu
> <ruxandra.radulescu@....com>; devel@...verdev.osuosl.org;
> stuyoder@...il.com; Roy Pledge <roy.pledge@....com>; linux-
> kernel@...r.kernel.org; Leo Li <leoyang.li@....com>; Bogdan Purcareata
> <bogdan.purcareata@....com>; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH v3] staging: fsl-mc: use 32bits to support 64K size mc-
> portals
> 
> On Wed, Nov 22, 2017 at 10:49:50AM +0000, Laurentiu Tudor wrote:
> >
> >
> > On 11/22/2017 09:48 AM, Bharat Bhushan wrote:
> > > As per APIs each mc-portal is of 64K size while currently 16bits
> > > (type u16) is used to store size of mc-portal.
> > > In these cases upper bit of portal size gets truncated.
> > >
> > > Signed-off-by: Bharat Bhushan <Bharat.Bhushan@....com>
> > > ---
> >
> > Ok, so just to clarify this fixes the case where size is equal (or
> > maybe larger in the future) to 0x10000.
> 
> Is this something that can happen today?  Is this needed in 4.14 to fix a
> problem people are having and need to be backported to stable, or can it
> wait until 4.15?

We can wait for 4.15 and no need to backport.

Thanks
-Bharat

> 
> thanks,
> 
> greg k-h