linux-kernel - Re: [PATCH 0/4] Reinstate and improve MIPS `do

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Date:   Wed, 21 Apr 2021 21:04:10 +0200 (CEST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
cc:     Arnd Bergmann <arnd@...db.de>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-arch@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] Reinstate and improve MIPS `do_div' implementation

On Wed, 21 Apr 2021, H. Nikolaus Schaller wrote:

> > In the end I have included four patches on this occasion: 1/4 is the test 
> > module, 2/4 is an inline documentation fix/clarification for the `do_div' 
> > wrapper, 3/4 enables the MIPS `__div64_32' backend and 4/4 adds a small 
> > performance improvement to it.
> 
> How can I apply them to the kernel? There is something wrong which makes
> git am fail.

 I don't know.  The changes were made against vanilla 5.12-rc7, but then 
the pieces affected have not changed for ages.  FWIW I can `git am' the 
series as received back just fine.

> > These changes have been verified with a DECstation system with an R3400 
> > MIPS I processor @40MHz and a MTI Malta system with a 5Kc MIPS64 processor 
> > @160MHz.
> 
> I'd like to test on ~320 MHz JZ4730.

 Sure, I'd love to hear how this code performs with other implementations.  

  Maciej