linux-kernel - Re: [PATCH v2] MIPS: kernel: Reserve exception base early to prevent corruption

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Date:   Sun, 7 Mar 2021 22:47:35 +0100 (CET)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kamal Dasu <kdasu.kdev@...il.com>
Subject: Re: [PATCH v2] MIPS: kernel: Reserve exception base early to prevent
 corruption

On Sun, 7 Mar 2021, Thomas Bogendoerfer wrote:

> > Are you sure all of them have "cpu_has_mips_r2_r6" macro returning
> > true (false) in order to safely use the lowest region in accordance
> > with the conditional statement you've added?
> 
> some of them are not R2 (SB1), others are. 

 For the record Malta is just about anything from MIPS IV up (though the 
QED RM5261 and RM7061 core cards have been quite rare).

  Maciej