From: Alexander Potapenko <[email protected]> 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/[email protected] Signed-off-by: Alexander Potapenko <[email protected]> Acked-by: Andrey Ryabinin <[email protected]> Cc: Dmitry Vyukov <[email protected]> Cc: Andrey Konovalov <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Joonsoo Kim <[email protected]> Cc: Kuthonuzo Luruo <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> https://jira.sw.ru/browse/PSBM-69081 (cherry picked from commit bcbf0d566b6e59a6e873bfe415cc415111a819e2) Signed-off-by: Andrey Ryabinin <[email protected]> --- mm/kasan/quarantine.c | 7 ++----- 1 file 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; -- 2.13.5 _______________________________________________ Devel mailing list [email protected] https://lists.openvz.org/mailman/listinfo/devel
