mm: drop NULL return check of pte_offset_map_lock()

pte_offset_map_lock() finds and takes ptl, and returns pte.  But some
callers return without unlocking the ptl when pte == NULL, which seems
weird.

Git history said that !pte check in change_pte_range() was introduced in
commit 1ad9f620c3a2 ("mm: numa: recheck for transhuge pages under lock
during protection changes") and still remains after commit 175ad4f1e7a2
("mm: mprotect: use pmd_trans_unstable instead of taking the pmd_lock")
which partially reverts 1ad9f620c3a2.  So I think that it's just dead
code.

Many other caller of pte_offset_map_lock() never check NULL return, so
let's do likewise.

Link: http://lkml.kernel.org/r/1495089737-1292-1-git-send-email-n-horiguchi@ah.jp.nec.com
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index bb11c47..bf3aab1 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4014,8 +4014,6 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address,
                goto out;
 
        ptep = pte_offset_map_lock(mm, pmd, address, ptlp);
-       if (!ptep)
-               goto out;
        if (!pte_present(*ptep))
                goto unlock;
        *ptepp = ptep;

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 8edd0d5..1a8c9ca 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -58,8 +58,6 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
         * reading.
         */
        pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
-       if (!pte)
-               return 0;
 
        /* Get target node for single threaded private VMAs */
        if (prot_numa && !(vma->vm_flags & VM_SHARED) &&