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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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxxxxxxx are
swap-add-warning-if-swap-slots-cache-failed-to-initialize.patch
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