[PATCH] x86/mm: fix function name typo in pmd_read_atomic() comment

[Wei Yang <richardw.yang@linux.intel.com>]

The function involved should be pte_offset_map_lock and we never have
function pmd_offset_map_lock defined.

Fixes: 26c191788f18 ("mm: pmd_read_atomic: fix 32bit PAE pmd walk vs pmd_populate SMP race conditio")

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
---

Hope my understanding is correct.

---
 arch/x86/include/asm/pgtable-3level.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h
index e3633795fb22..45e6099fe6b7 100644
--- a/arch/x86/include/asm/pgtable-3level.h
+++ b/arch/x86/include/asm/pgtable-3level.h
@@ -44,10 +44,10 @@ static inline void native_set_pte(pte_t *ptep, pte_t pte)
  * pmd_populate rightfully does a set_64bit, but if we're reading the
  * pmd_t with a "*pmdp" on the mincore side, a SMP race can happen
  * because gcc will not read the 64bit of the pmd atomically. To fix
- * this all places running pmd_offset_map_lock() while holding the
+ * this all places running pte_offset_map_lock() while holding the
  * mmap_sem in read mode, shall read the pmdp pointer using this
  * function to know if the pmd is null nor not, and in turn to know if
- * they can run pmd_offset_map_lock or pmd_trans_huge or other pmd
+ * they can run pte_offset_map_lock or pmd_trans_huge or other pmd
  * operations.
  *
  * Without THP if the mmap_sem is hold for reading, the pmd can only
-- 
2.17.1