From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greentime Hu <green.hu@gmail.com>
Subject: Re: [PATCH v2 19/35] nds32: L2 cache support
Date: Wed, 29 Nov 2017 19:53:37 +0800
Message-ID: <CAEbi=3fpM0gK4-xRPdZ0HYEAriwgspOQtV1aVx586AObQLVBiw@mail.gmail.com>
References: <cover.1511785528.git.green.hu@gmail.com> <380808fe9139e2c3800ae76dfa6aa5cbbbc4894f.1511785528.git.green.hu@gmail.com>
 <CAK8P3a2P+A55TyC_1bCj=sDjLZmpQoMptbZ59yd191fqdUstSA@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <CAK8P3a2P+A55TyC_1bCj=sDjLZmpQoMptbZ59yd191fqdUstSA@mail.gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
To: Arnd Bergmann <arnd@arndb.de>
Cc: Greentime <greentime@andestech.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-arch <linux-arch@vger.kernel.org>, Thomas Gleixner <tglx@linutronix.de>, Jason Cooper <jason@lakedaemon.net>, Marc Zyngier <marc.zyngier@arm.com>, Rob Herring <robh+dt@kernel.org>, Networking <netdev@vger.kernel.org>, Vincent Chen <deanbo422@gmail.com>, DTML <devicetree@vger.kernel.org>, Al Viro <viro@zeniv.linux.org.uk>, David Howells <dhowells@redhat.com>, Will Deacon <will.deacon@arm.com>, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-serial@vger.kernel.org, Vincent Chen <vincentc@andestech.com>
List-Id: devicetree@vger.kernel.org

Hi, Arnd:

2017-11-27 22:33 GMT+08:00 Arnd Bergmann <arnd@arndb.de>:
> On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu <green.hu@gmail.com> wrote:
>> +
>> +#define L2C_R_REG(offset)               __raw_readl(atl2c_base + offset)
>> +#define L2C_W_REG(offset, value)        __raw_writel(value, atl2c_base + offset)
>
> __raw_readl() is generally not endian-safe, and might  not have the barriers you
> require here. Could you use readl/writel here, and only fall back to
> readl_relaxed()/writel_relaxed() when you absolutely must avoid the barriers?

Thanks for your suggestions.
We will changed it to readl/writel

>> diff --git a/arch/nds32/kernel/atl2c.c b/arch/nds32/kernel/atl2c.c
>> new file mode 100644
>> index 0000000..dd87fc9
>> --- /dev/null
>> +++ b/arch/nds32/kernel/atl2c.c
>> +#include <linux/compiler.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_fdt.h>
>> +#include <linux/of_platform.h>
>> +#include <asm/l2_cache.h>
>
> If this is the only file that includes asm/l2_cache.h, then I'd simply
> move the entire
> contents in here, rather than having a separate file in the global namespace.
>

arch/nds32/mm/proc.c also includes this file so I will keep it.