linux-kernel - Re: [PATCH v2 1/1] ARM: LPAE: use phys_addr_t instead of unsigned long in outercache hooks

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Date:   Wed, 30 Dec 2020 19:12:35 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] ARM: LPAE: use phys_addr_t instead of unsigned
 long in outercache hooks



On 2020/12/30 17:54, Russell King - ARM Linux admin wrote:
> On Wed, Dec 30, 2020 at 04:28:05PM +0800, Zhen Lei 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>
> 
> This is fine, but there really needs to be a patch that makes use of
> this change before we accept it into mainline kernels.
> 

OK, I will send the outcache driver of Hisilicon after New Year's Day.