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SubjectRe: [PATCH v4 06/26] shmem/userfaultfd: Handle uffd-wp special pte in page fault handler
On Thu, Jul 15, 2021 at 02:20:21PM +0800, kernel test robot wrote:
> Hi Peter,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v5.14-rc1 next-20210714]
> [cannot apply to hnaz-linux-mm/master asm-generic/master linux/master]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
>
> url: https://github.com/0day-ci/linux/commits/Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20210715-062718
> base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 8096acd7442e613fad0354fc8dfdb2003cceea0b
> config: x86_64-randconfig-r021-20210714 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 0e49c54a8cbd3e779e5526a5888c683c01cc3c50)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install x86_64 cross compiling tool for clang build
> # apt-get install binutils-x86-64-linux-gnu
> # https://github.com/0day-ci/linux/commit/8b3e70f40b8333a803e642ed5c8cce738985881c
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review Peter-Xu/userfaultfd-wp-Support-shmem-and-hugetlbfs/20210715-062718
> git checkout 8b3e70f40b8333a803e642ed5c8cce738985881c
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> >> mm/memory.c:4167:6: error: implicit declaration of function 'uffd_disable_fault_around' [-Werror,-Wimplicit-function-declaration]
> if (uffd_disable_fault_around(vmf->vma))
> ^
> 1 error generated.
>
>
> vim +/uffd_disable_fault_around +4167 mm/memory.c
>
> 4159
> 4160 /* Return true if we should do read fault-around, false otherwise */
> 4161 static inline bool should_fault_around(struct vm_fault *vmf)
> 4162 {
> 4163 /* No ->map_pages? No way to fault around... */
> 4164 if (!vmf->vma->vm_ops->map_pages)
> 4165 return false;
> 4166
> > 4167 if (uffd_disable_fault_around(vmf->vma))
> 4168 return false;
> 4169
> 4170 return fault_around_bytes >> PAGE_SHIFT > 1;
> 4171 }
> 4172
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Will squash this into the patch:

---8<---
diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index c4228acd1d80..4382240de7c3 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -283,6 +283,11 @@ static inline bool pte_swp_uffd_wp_special(pte_t pte)
return false;
}

+static inline bool uffd_disable_fault_around(struct vm_area_struct *vma)
+{
+ return false;
+}
+
#endif /* CONFIG_USERFAULTFD */

#endif /* _LINUX_USERFAULTFD_K_H */
---8<---
Thanks,

--
Peter Xu

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