Re: [PATCH] mm: add VM_STATIC flag to vmalloc and prevent from removing the areas

Ho-Eun Ryu
2017-04-13T01:03:27Z

> On 13 Apr 2017, at 2:31 AM, Christoph Hellwig <hch@infradead.org> wrote:
>
> On Wed, Apr 12, 2017 at 08:42:08PM +0900, Hoeun Ryu wrote:
>>
>>> On Apr 12, 2017, at 3:02 PM, Christoph Hellwig <hch@infradead.org> wrote:
>>>
>>>> On Wed, Apr 12, 2017 at 02:01:59PM +0900, Hoeun Ryu wrote:
>>>> vm_area_add_early/vm_area_register_early() are used to reserve vmalloc area
>>>> during boot process and those virtually mapped areas are never unmapped.
>>>> So `OR` VM_STATIC flag to the areas in vmalloc_init() when importing
>>>> existing vmlist entries and prevent those areas from being removed from the
>>>> rbtree by accident.
>>>
>>> How would they be removed "by accident"?
>>
>> I don't mean actual use-cases, but I just want to make it robust against like programming errors.
>
> Oh, ok. The patch makes sense then, although the changelog could use
> a little update.

OK, I will.
Any other suggestions for code itself ?