Commit bcbf0d56 authored Aug 11, 2016 by Alexander Potapenko Committed by Linus Torvalds Aug 11, 2016

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>

parent 615d66c3

mm/kasan/quarantine.c

+2 −5

Original line number	Diff line number	Diff line
		@@ -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;

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