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authorAlexander Potapenko <glider@google.com>2016-08-12 00:33:06 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-12 01:58:14 +0200
commitbcbf0d566b6e59a6e873bfe415cc415111a819e2 (patch)
treebc511c93dbfc9ff2cfca6ca4fc699c9b002d44b4
parentmm: memcontrol: fix memcg id ref counter on swap charge move (diff)
downloadlinux-bcbf0d566b6e59a6e873bfe415cc415111a819e2.tar.xz
linux-bcbf0d566b6e59a6e873bfe415cc415111a819e2.zip
kasan: remove the unnecessary WARN_ONCE from quarantine.c
It's quite unlikely that the user will so little memory that the per-CPU quarantines won't fit into the given fraction of the available memory. Even in that case he won't be able to do anything with the information given in the warning. Link: http://lkml.kernel.org/r/1470929182-101413-1-git-send-email-glider@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Konovalov <adech.fo@gmail.com> Cc: Christoph Lameter <cl@linux.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kuthonuzo Luruo <kuthonuzo.luruo@hpe.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/kasan/quarantine.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index b6728a33a4ac..baabaad4a4aa 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -217,11 +217,8 @@ void quarantine_reduce(void)
new_quarantine_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) /
QUARANTINE_FRACTION;
percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus();
- if (WARN_ONCE(new_quarantine_size < percpu_quarantines,
- "Too little memory, disabling global KASAN quarantine.\n"))
- new_quarantine_size = 0;
- else
- new_quarantine_size -= percpu_quarantines;
+ new_quarantine_size = (new_quarantine_size < percpu_quarantines) ?
+ 0 : new_quarantine_size - percpu_quarantines;
WRITE_ONCE(quarantine_size, new_quarantine_size);
last = global_quarantine.head;