mm/swapfile.c: explicitly show ssd/non-ssd is handled mutually exclusive

The code shows if this is ssd, it will jump to specific tag and skip the
following code for non-ssd.

Let's use "else if" to explicitly show the mutually exclusion for
ssd/non-ssd to reduce ambiguity.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Link: http://lkml.kernel.org/r/20200328060520.31449-3-richard.weiyang@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index b6e68dc..264d583 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -763,9 +763,7 @@ static int scan_swap_map_slots(struct swap_info_struct *si,
                        goto checks;
                else
                        goto scan;
-       }
-
-       if (unlikely(!si->cluster_nr--)) {
+       } else if (unlikely(!si->cluster_nr--)) {
                if (si->pages - si->inuse_pages < SWAPFILE_CLUSTER) {
                        si->cluster_nr = SWAPFILE_CLUSTER - 1;
                        goto checks;
@@ -873,10 +871,8 @@ checks:
                        goto checks;
                else
                        goto done;
-       }
-
-       /* non-ssd case, still more slots in cluster? */
-       if (si->cluster_nr && !si->swap_map[++offset]) {
+       } else if (si->cluster_nr && !si->swap_map[++offset]) {
+               /* non-ssd case, still more slots in cluster? */
                --si->cluster_nr;
                goto checks;
        }