Re: [PATCH v4 1/2] mm/memory-failure: introduce "hwpoisoned-pages" entry

[Miaohe Lin <linmiaohe@huawei.com>]

On 2022/6/14 15:13, David Hildenbrand wrote:
> 	   &hwpoisoned_pages);
>>
>> I'm not sure how useful this interface from userspace (controlling test process
>> with this?).  Do we really need to expose this to userspace? 
>>
>>
>> TBH I feel that another approach like below is more desirable:
>>
>>   - define a new flag in "enum mf_flags" (for example named MF_SW_SIMULATED),
>>   - set the flag when calling memory_failure() from the three callers
>>     mentioned above,
>>   - define a global variable (typed bool) in mm/memory_failure.c_to show that
>>     the system has experienced a real hardware memory error events.
>>   - once memory_failure() is called without MF_SW_SIMULATED, the new global
>>     bool variable is set, and afterward unpoison_memory always fails with
>>     -EOPNOTSUPP.
> 
> Exactly what I had in mind.

This approach should be more straightforward. ;)

>