On Thu, 10 Feb 2022 02:51:05 +0800 kernel test robot <lkp@xxxxxxxxx> wrote: > tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > branch HEAD: 10207e3a840b47b5eae573486a88fb6e29884f77 Add linux-next specific files for 20220209 > > Error/Warning reports: > > https://lore.kernel.org/linux-mm/202201251833.Hon4gcuF-lkp@xxxxxxxxx > https://lore.kernel.org/linux-mm/202201290705.x0MS0OCH-lkp@xxxxxxxxx > https://lore.kernel.org/llvm/202202092059.9gegO2oq-lkp@xxxxxxxxx > > ... > > ld: gup.c:(.text+0x1eff): undefined reference to `migrate_vma_pages' > ld: gup.c:(.text+0x1f44): undefined reference to `migrate_vma_finalize' Presumably CONFIG_MIGRATION=y, CONFIG_DEVICE_PRIVATE=n, so these functions aren't built. Methinks Alistair's "mm/gup.c: migrate device coherent pages when pinning instead of failing" needs some repair, please.
