[patch 09/14] mm: compaction: fix compiler warning when CONFIG_COMPACTION=n

Andrew Morton
2022-04-15T02:13:52Z

From: Charan Teja Kalla <quic_charante@quicinc.com>
Subject: mm: compaction: fix compiler warning when CONFIG_COMPACTION=n

The below warning is reported when CONFIG_COMPACTION=n:

mm/compaction.c:56:27: warning: 'HPAGE_FRAG_CHECK_INTERVAL_MSEC'
defined but not used [-Wunused-const-variable=]
56 | static const unsigned int HPAGE_FRAG_CHECK_INTERVAL_MSEC =
500;
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix it by moving 'HPAGE_FRAG_CHECK_INTERVAL_MSEC' under
CONFIG_COMPACTION defconfig. Also since this is just a 'static const
int' type, use #define for it.

Link: https://lkml.kernel.org/r/1647608518-20924-1-git-send-email-quic_charante@quicinc.com
Signed-off-by: Charan Teja Kalla <quic_charante@quicinc.com>
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Nitin Gupta <nigupta@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/compaction.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

--- a/mm/compaction.c~mm-compaction-fix-compiler-warning-when-config_compaction=n
+++ a/mm/compaction.c
@@ -26,6 +26,11 @@
#include "internal.h"

#ifdef CONFIG_COMPACTION
+/*
+ * Fragmentation score check interval for proactive compaction purposes.
+ */
+#define HPAGE_FRAG_CHECK_INTERVAL_MSEC (500)
+
static inline void count_compact_event(enum vm_event_item item)
{
count_vm_event(item);
@@ -51,11 +56,6 @@ static inline void count_compact_events(
#define pageblock_end_pfn(pfn) block_end_pfn(pfn, pageblock_order)

/*
- * Fragmentation score check interval for proactive compaction purposes.
- */
-static const unsigned int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
-
-/*
* Page order with-respect-to which proactive compaction
* calculates external fragmentation, which is used as
* the "fragmentation score" of a node/zone.
_