+ swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch added to -mm tree

+ swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm/swap_slots.c: add warning if swap slots cache failed to initialize
has been added to the -mm tree.  Its filename is
     swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch

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------------------------------------------------------
From: Tim Chen <tim.c.chen@linux.intel.com>
Subject: mm/swap_slots.c: add warning if swap slots cache failed to initialize

Add a warning diagnostics to user if we failed to allocate swap slots
cache and use it.

Link: http://lkml.kernel.org/r/20170328234827.GA10107@linux.intel.com
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swap_slots.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff -puN mm/swap_slots.c~swap-add-warning-if-swap-slots-cache-failed-to-initialize mm/swap_slots.c
--- a/mm/swap_slots.c~swap-add-warning-if-swap-slots-cache-failed-to-initialize
+++ a/mm/swap_slots.c
@@ -241,8 +241,11 @@ int enable_swap_slots_cache(void)
 
 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "swap_slots_cache",
 				alloc_swap_slot_cache, free_slot_cache);
-	if (ret < 0)
+	if (ret < 0) {
+		WARN_ONCE(1, "Cache allocation failed (%s), operate without swap slots cache.\n",
+				__func__);
 		goto out_unlock;
+	}
 	swap_slot_cache_initialized = true;
 	__reenable_swap_slots_cache();
 out_unlock:
_

Patches currently in -mm which might be from tim.c.chen@linux.intel.com are

swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch