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UPSTREAM: kasan: remove the unnecessary WARN_ONCE from quarantine.c

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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>

Bug: 64145065
(cherry-picked from bcbf0d566b)
Change-Id: I1230018140c32fab7ea1d1dc1d54471aa48ae45f
Signed-off-by: Paul Lawrence <paullawrence@google.com>
This commit is contained in:
Alexander Potapenko
2016-08-11 15:33:06 -07:00
committed by Amit Pundir
parent 1bd1cfb3bf
commit 241f6bfcd4
1 changed files with 2 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
mm/kasan/quarantine.c
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@@ -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;