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

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Date:   Fri, 24 Nov 2017 16:58:48 +0100
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     Bharat Bhushan <bharat.bhushan@....com>,
        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

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?

thanks,

greg k-h