mm/slub.c: parse slub_debug O option in switch statement

By moving the O option detection into the switch statement, we allow this
parameter to be combined with other options correctly.  Previously options
like slub_debug=OFZ would only detect the 'o' and use DEBUG_DEFAULT_FLAGS
to fill in the rest of the flags.

Signed-off-by: Chris J Arges <chris.j.arges@canonical.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 9 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 82c473780c91..d01f9126fcf2 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1137,15 +1137,6 @@ static int __init setup_slub_debug(char *str)
                  */
                 goto check_slabs;
 
-        if (tolower(*str) == 'o') {
-                /*
-                 * Avoid enabling debugging on caches if its minimum order
-                 * would increase as a result.
-                 */
-                disable_higher_order_debug = 1;
-                goto out;
-        }
-
         slub_debug = 0;
         if (*str == '-')
                 /*
@@ -1176,6 +1167,13 @@ static int __init setup_slub_debug(char *str)
                 case 'a':
                         slub_debug |= SLAB_FAILSLAB;
                         break;
+                case 'o':
+                        /*
+                         * Avoid enabling debugging on caches if its minimum
+                         * order would increase as a result.
+                         */
+                        disable_higher_order_debug = 1;
+                        break;
                 default:
                         pr_err("slub_debug option '%c' unknown. skipped\n",
                                *str);