__vmap_pages_range_noflush() currently only warns when page_shift is smaller than PAGE_SHIFT, then continues with the invalid shift. Return -EINVAL instead so the bogus argument is caught immediately. Link: https://lore.kernel.org/20261004071639.119857-1-jiangwenxiaomi@gmail.com Signed-off-by: Wen Jiang <jiangwen6@xiaomi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Suggested-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Barry Song <baohua@kernel.org> Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by: Vishal Moola (Fractile) <vishal.moola@gmail.com> Cc: Dev Jain <dev.jain@arm.com>