On Tue, Jul 3, 2018 at 9:54 AM, Jason Gunthorpe <jgg@xxxxxxxxxxxx> wrote:
> On Sun, Jul 01, 2018 at 09:10:57AM -0700, Dan Williams wrote:
>
>> I think we also need the following clue bat for people like me in the future:
>>
>> diff --git a/mm/gup.c b/mm/gup.c
>> index b70d7ba7cc13..388a5c799fa5 100644
>> +++ b/mm/gup.c
>> @@ -873,6 +873,8 @@ static __always_inline long
>> __get_user_pages_locked(struct task_struct *ts
>> long ret, pages_done;
>> bool lock_dropped;
>>
>> + lockdep_assert_held_read(&mm->mmap_sem);
>> +
>> if (locked) {
>> /* if VM_FAULT_RETRY can be returned, vmas become invalid */
>> BUG_ON(vmas);
>
> Yes please, I had the same thought..
>
> Dan, can you make this happen?
>
Sure, I'll send the correct version of this to Andrew and cc you.
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