KASAN_ALLOCA_REDZONE_SIZE
size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
KASAN_ALLOCA_REDZONE_SIZE);
WARN_ON(!IS_ALIGNED((unsigned long)addr, KASAN_ALLOCA_REDZONE_SIZE));
kasan_poison(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
kasan_poison(right_redzone, padding_size + KASAN_ALLOCA_REDZONE_SIZE,