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mm/swap_slots.c: add warning if swap slots cache failed to initialize

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

[akpm@linux-foundation.org: use WARN_ONCE return value, fix grammar in message]
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tim Chen 2017-05-03 14:54:48 -07:00 committed by Linus Torvalds
parent 9927e38876
commit 9b7a814327
1 changed files with 3 additions and 1 deletions
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mm/swap_slots.c
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@ -241,8 +241,10 @@ 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 (WARN_ONCE(ret < 0, "Cache allocation failed (%s), operating "
"without swap slots cache.\n", __func__))
goto out_unlock;
swap_slot_cache_initialized = true;
__reenable_swap_slots_cache();
out_unlock: