On Wed, Dec 21, 2016 at 08:48:09AM +0100, Michal Hocko wrote:
>On Tue 20-12-16 16:35:40, Wei Yang wrote:
>> On Mon, Dec 19, 2016 at 04:15:14PM +0100, Michal Hocko wrote:
>> >On Sun 18-12-16 14:47:49, Wei Yang wrote:
>> >> The base address is already guaranteed to be in the region by
>> >> memblock_search().
>> >
>>
>> Hi, Michal
>>
>> Nice to receive your comment.
>>
>> >First of all the way how the check is removed is the worst possible...
>> >Apart from that it is really not clear to me why checking the base
>> >is not needed. You are mentioning memblock_search but what about other
>> >callers? adjust_range_page_size_mask e.g...
>> >
>>
>> Hmm... the memblock_search() is called by memblock_is_region_memory(). Maybe
>> I
>> paste the whole function here would clarify the change.
>>
>> int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t
>> size)
>> {
>> int idx = memblock_search(&memblock.memory, base);
>> phys_addr_t end = base + memblock_cap_size(base, &size);
>>
>> if (idx == -1)
>> return 0;
>> return memblock.memory.regions[idx].base <= base &&
>> (memblock.memory.regions[idx].base +
>> memblock.memory.regions[idx].size) >= end;
>> }
>
>Ohh, my bad. I thought that memblock_search is calling
>memblock_is_region_memory. I didn't notice this is other way around.
>Then I agree that the check for the base is not needed and can be
>removed.
Thanks~
I would feel honored if you would like to add Acked-by :-)
>--
>Michal Hocko
>SUSE Labs
--
Wei Yang
Help you, Help me
