mm, thp: fix comment inconsistency for swapin readahead functions

After fixing swapin issues, comment lines stayed as in old version.
This patch updates the comments.

Link: http://lkml.kernel.org/r/1468109345-32258-1-git-send-email-ebru.akagunduz@gmail.com
Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 93d5f87..5661484 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -891,9 +891,10 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
                /* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
                if (ret & VM_FAULT_RETRY) {
                        down_read(&mm->mmap_sem);
-                       /* vma is no longer available, don't continue to swapin */
-                       if (hugepage_vma_revalidate(mm, address))
+                       if (hugepage_vma_revalidate(mm, address)) {
+                               /* vma is no longer available, don't continue to swapin */
                                return false;
+                       }
                        /* check if the pmd is still valid */
                        if (mm_find_pmd(mm, address) != pmd)
                                return false;
@@ -969,7 +970,7 @@ static void collapse_huge_page(struct mm_struct *mm,
 
        /*
         * __collapse_huge_page_swapin always returns with mmap_sem locked.
-        * If it fails, release mmap_sem and jump directly out.
+        * If it fails, we release mmap_sem and jump out_nolock.
         * Continuing to collapse causes inconsistency.
         */
        if (!__collapse_huge_page_swapin(mm, vma, address, pmd)) {