atomic_dec_unless_positive
return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY;
return atomic_dec_unless_positive(&mapping->i_mmap_writable) ?
if (!atomic_dec_unless_positive(&pmu->exclusive_cnt))
KUNIT_EXPECT_KASAN_FAIL(test, atomic_dec_unless_positive(unsafe));
return atomic_dec_unless_positive(v);
if (!atomic_dec_unless_positive(&runtime->buffer_accessing))