linux-kernel - Re: [PATCH v5 1/4] ARM: LPAE: Use phys_addr_t instead of unsigned long in outercache hooks

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Message-ID: <CAK8P3a09ypz4HjJUofFaV2NZd_3=0woC6es6w+E1_cvE=9K4UQ@mail.gmail.com>
Date:   Thu, 28 Jan 2021 15:29:12 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Russell King <rmk+kernel@....linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/4] ARM: LPAE: Use phys_addr_t instead of unsigned
 long in outercache hooks

On Sat, Jan 16, 2021 at 4:27 AM Zhen Lei <thunder.leizhen@...wei.com> wrote:
>
> The outercache of some Hisilicon SOCs support physical addresses wider
> than 32-bits. The unsigned long datatype is not sufficient for mapping
> physical addresses >= 4GB. The commit ad6b9c9d78b9 ("ARM: 6671/1: LPAE:
> use phys_addr_t instead of unsigned long in outercache functions") has
> already modified the outercache functions. But the parameters of the
> outercache hooks are not changed. This patch use phys_addr_t instead of
> unsigned long in outercache hooks: inv_range, clean_range, flush_range.
>
> To ensure the outercache that does not support LPAE works properly, do
> cast phys_addr_t to unsigned long by adding a group of temporary
> variables. For example:
> -static void l2c220_inv_range(unsigned long start, unsigned long end)
> +static void l2c220_inv_range(phys_addr_t pa_start, phys_addr_t pa_end)
>  {
> +       unsigned long start = pa_start;
> +       unsigned long end = pa_end;
>
> Note that the outercache functions have been doing this cast before this
> patch. So now, the cast is just moved into the outercache hook functions.
>
> No functional change.
>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>

Reviewed-by: Arnd Bergmann <arnd@...db.de>