arch/x86/mm/kmmio.c:392 add_kmmio_fault_page() warn: returning -1 instead of -ENOMEM is sloppy In the following kernel version: name: linux-next url: http://kernel.source.codeaurora.cn/pub/scm/linux/kernel/git/next/linux-next.git branch: next-20230721 commit: ae867bc97b713121b2a7f5fcac68378a0774739b