linux-kernel - Re: [PATCH v2 19/35] nds32: L2 cache support

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Message-ID: <CAK8P3a2P+A55TyC_1bCj=sDjLZmpQoMptbZ59yd191fqdUstSA@mail.gmail.com>
Date:   Mon, 27 Nov 2017 15:33:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Greentime Hu <green.hu@...il.com>
Cc:     Greentime <greentime@...estech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Vincent Chen <deanbo422@...il.com>,
        DTML <devicetree@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-serial@...r.kernel.org, Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v2 19/35] nds32: L2 cache support

On Mon, Nov 27, 2017 at 1:28 PM, Greentime Hu <green.hu@...il.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?

> 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.

          Arnd