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SubjectRe: [PATCH] arm64/mm: Poison initmem while freeing with free_reserved_area()
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On 04/10/2019 11:48, Anshuman Khandual wrote:
>
>
> On 10/04/2019 03:49 PM, Steven Price wrote:
>> On 04/10/2019 05:23, Anshuman Khandual wrote:
>>> Platform implementation for free_initmem() should poison the memory while
>>> freeing it up. Hence pass across POISON_FREE_INITMEM while calling into
>>> free_reserved_area(). The same is being followed in the generic fallback
>>> for free_initmem() and some other platforms overriding it.
>>>
>>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>>> Cc: Will Deacon <will@kernel.org>
>>> Cc: Mark Rutland <mark.rutland@arm.com>
>>> Cc: linux-kernel@vger.kernel.org
>>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>>
>> Is there a good reason you haven't made a similar change to
>> free_initrd_mem() - the same logic seems to apply. However this change
>> looks fine to me.
>
> We will use generic free_initrd_mem() going forward as proposed in a recent
> patch which does call free_reserved_area() with POISON_FREE_INITMEM.
>
> https://patchwork.kernel.org/patch/11165379/

Great - that sounds like a very good reason!

Thanks,

Steve

>>
>> Reviewed-by: Steven Price <steven.price@arm.com>
>>
>>> ---
>>> arch/arm64/mm/init.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
>>> index 45c00a54909c..ea7d38011e83 100644
>>> --- a/arch/arm64/mm/init.c
>>> +++ b/arch/arm64/mm/init.c
>>> @@ -571,7 +571,7 @@ void free_initmem(void)
>>> {
>>> free_reserved_area(lm_alias(__init_begin),
>>> lm_alias(__init_end),
>>> - 0, "unused kernel");
>>> + POISON_FREE_INITMEM, "unused kernel");
>>> /*
>>> * Unmap the __init region but leave the VM area in place. This
>>> * prevents the region from being reused for kernel modules, which
>>>
>>
>>
>
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> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

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