linux-kernel - Re: [PATCH] riscv: Implement free_initrd

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Date:   Thu, 08 Mar 2018 12:31:28 -0800 (PST)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     shea@...alevy.com
CC:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH] riscv: Implement free_initrd_mem.

On Thu, 08 Mar 2018 11:47:08 PST (-0800), shea@...alevy.com wrote:
> Palmer Dabbelt <palmer@...ive.com> writes:
>
>> On Thu, 08 Mar 2018 11:14:52 PST (-0800), shea@...alevy.com wrote:
>>> Hi Palmer,
>>>
>>> Palmer Dabbelt <palmer@...ive.com> writes:
>>>
>>>> On Tue, 20 Feb 2018 05:50:43 PST (-0800), shea@...alevy.com wrote:
>>>>> Signed-off-by: Shea Levy <shea@...alevy.com>
>>>>> ---
>>>>>  arch/riscv/mm/init.c | 6 ++++++
>>>>>  1 file changed, 6 insertions(+)
>>>>>
>>>>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>>>>> index c77df8142be2..1c832b541e95 100644
>>>>> --- a/arch/riscv/mm/init.c
>>>>> +++ b/arch/riscv/mm/init.c
>>>>> @@ -66,5 +66,11 @@ void free_initmem(void)
>>>>>  #ifdef CONFIG_BLK_DEV_INITRD
>>>>>  void free_initrd_mem(unsigned long start, unsigned long end)
>>>>>  {
>>>>> +	if (start == initrd_start)
>>>>> +		start = round_down(start, PAGE_SIZE);
>>>>> +	if (end == initrd_end)
>>>>> +		end = round_up(end, PAGE_SIZE);
>>>>> +
>>>>> +	free_reserved_area((void *)start, (void *)end, -1, "initrd");
>>>>>  }
>>>>>  #endif /* CONFIG_BLK_DEV_INITRD */
>>>>
>>>> It looks like everyone is doing something slightly different here:
>>>>
>>>> * arm64 doesn't round to a page size, and has keep_initrd.
>>>> * arm calls poison_init_mem(), and has keep_initrd.
>>>> * sparc64 doesn't round, and doesn't have a keep_initrd.
>>>> * mips doesn't round, and doesn't have a keep_initrd.
>>>> * x86 rounds end to a page size but not start, and doesn't have a keep_initrd.
>>>>
>>>> It feels like this should be something generic.  I'm adding linux-kernel to see 
>>>> what people think.
>>>
>>> Should I try to whip up something generic?
>>
>> I think that'd be best.  Nobody has said anything specific, but it's generally 
>> been suggested to take bits that we copy into our port and make them generic.  
>> If there's no clean way do to so then I'm OK taking this, though.
>
> OK, will add it to my queue.

Thanks!