On 03/11/2014 04:30 PM, Andrew Morton wrote:
I worry about what happens if __get_user_pages decides to do
if (ret & VM_FAULT_RETRY) {
if (nonblocking)
*nonblocking = 0;
return i;
}
uh-oh, that just cleared __mm_populate()'s `locked' variable and we'll
forget to undo mmap_sem. That won't explain this result, but it's a
potential problem.
That's actually seems right because if 'ret & VM_FAULT_RETRY' is true it means that
lock_page_or_retry() was supposed to release mmap_sem for us.
Thanks,
Sasha
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