s390, thp: remove infrastructure for handling splitting PMDs

[uclinux-h8/linux.git] / arch / s390 / mm / gup.c

diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index 1a2cad5..13dab0c 100644 (file)
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -105,16 +105,7 @@ static inline int gup_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr,
                pmd = *pmdp;
                barrier();
                next = pmd_addr_end(addr, end);
-               /*
-                * The pmd_trans_splitting() check below explains why
-                * pmdp_splitting_flush() has to serialize with
-                * smp_call_function() against our disabled IRQs, to stop
-                * this gup-fast code from running while we set the
-                * splitting bit in the pmd. Returning zero will take
-                * the slow path that will call wait_split_huge_page()
-                * if the pmd is still in splitting state.
-                */
-               if (pmd_none(pmd) || pmd_trans_splitting(pmd))
+               if (pmd_none(pmd))
                        return 0;
                if (unlikely(pmd_large(pmd))) {
                        /*