linux-kernel - Re: [PATCH] riscv: move sifive_l2

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Message-ID: <alpine.DEB.2.21.9999.1908070832500.13971@viisi.sifive.com>
Date:   Wed, 7 Aug 2019 08:40:58 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Christoph Hellwig <hch@....de>
cc:     Greg KH <gregkh@...uxfoundation.org>, arnd@...db.de,
        palmer@...ive.com, linux-kernel@...r.kernel.org,
        james.morse@....com, linux-riscv@...ts.infradead.org,
        mchehab@...nel.org, linux-edac@...r.kernel.org
Subject: Re: [PATCH] riscv: move sifive_l2_cache.c to drivers/misc

On Wed, 7 Aug 2019, Christoph Hellwig wrote:

> On Wed, Aug 07, 2019 at 05:22:15PM +0200, Greg KH wrote:
> > > Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
> > > Signed-off-by: Christoph Hellwig <hch@....de>
> > > ---
> > >  arch/riscv/mm/Makefile                            | 1 -
> > >  drivers/misc/Makefile                             | 1 +
> > >  {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c | 0
> > >  3 files changed, 1 insertion(+), 1 deletion(-)
> > >  rename {arch/riscv/mm => drivers/misc}/sifive_l2_cache.c (100%)
> > 
> > Why isn't this in drivers/edac/ ?
> > why is this a misc driver?  Seems like it should sit next to the edac
> > stuff.
> 
> No idea.  EDAC maintainers, would you object to taking what is 
> currently in arch/riscv/mm//sifive_l2_cache.c to drivers/edac/ ?

If this driver is moved out of arch/riscv/mm, it should ideally go into 
some sort of common L2 cache controller driver directory, along 
with other L2 cache controller drivers like arch/arm/mm/*l2c*. 

Like many L2 cache controllers, this controller also supports cache 
flushing operations and SoC-specific way operations.  We just don't use 
those on RISC-V - yet.


- Paul