Maybe, the solution is below
...
// >>> ptep_clear((__vma)->vm_mm, __address, __ptep);
// >>> flush_tlb_page(__vma, __address);
// >>> __ptep;
...
And even so, we also get a pte with present = 0 AND its dirty = 1, an odd pte.
Remember B dirtied the pte before A executes flush_tlb_page.
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