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

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Message-ID: <87efkuv0pf.fsf@xps13.shealevy.com>
Date:   Thu, 08 Mar 2018 14:14:52 -0500
From:   Shea Levy <shea@...alevy.com>
To:     Palmer Dabbelt <palmer@...ive.com>, linux-kernel@...r.kernel.org
Cc:     linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] riscv: Implement free_initrd_mem.

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?

Thanks,
Shea

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