openzfs
compat 6.18 clang - build failing
System information
| Type | Version/Name |
|---|---|
| Distribution Name | Garuda |
| Distribution Version | Soaring |
| Kernel Version | 6.18-rc6 |
| Architecture | x86_64 |
| OpenZFS Version | 2.4.99-225_g06c73cffab |
Describe the problem you're observing
on linux 6.18-rc6 the check config/kernel-kmap-atomic-args.m4 fails. The cause is that kmap_atomic had its argument changed to const in mm: constify highmem related functions for improved const-correctness happens only with clang, gcc passes.
modyfiing config/kernel-kmap-atomic-args.m4:
struct page page; -> struct page page = {0};
makes the check pass both on gcc and clang.
Describe how to reproduce the problem
./configure KERNEL_LLVM=1 ...
Include any warning/errors/backtraces from the system logs
- output from configure:
checking whether splice_copy_file_range() is available... yes checking whether fops->remap_file_range() is available... yes checking whether fops->clone_file_range() is available... no checking whether fops->dedupe_file_range() is available... no checking whether kmap_atomic wants 1 args... configure: error: *** None of the expected "kmap_atomic()" interfaces were detected. *** This may be because your kernel version is newer than what is *** supported, or you are using a patched custom kernel with *** incompatible modifications. *** *** ZFS Version: zfs-2.4.99-225_g06c73cffab *** Compatible Kernels: 4.18 - 6.17
- failing check, build/build.log.kabi:
kmap_atomic/kmap_atomic.c:78:16: error: variable 'page' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer] 78 | kmap_atomic(&page); | ^~~~ kmap_local_page/kmap_local_page.c:78:20: error: variable 'page' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer] 78 | kmap_local_page(&page); | ^~~~ 1 error generated. 1 error generated. make[4]: *** [/tmp/makepkg/linux-cachyos-rc/src/linux-6.18-rc6/scripts/Makefile.build:287: kmap_atomic/kmap_atomic.o] Error 1 make[4]: *** [/tmp/makepkg/linux-cachyos-rc/src/linux-6.18-rc6/scripts/Makefile.build:287: kmap_local_page/kmap_local_page.o] Error 1 make[4]: Target 'kmap_atomic/' not remade because of errors. make[4]: Target 'kmap_local_page/' not remade because of errors. make[3]: *** [/tmp/makepkg/linux-cachyos-rc/src/linux-6.18-rc6/scripts/Makefile.build:556: kmap_atomic] Error 2 CC [M] i_uid_read/i_uid_read.o make[3]: *** [/tmp/makepkg/linux-cachyos-rc/src/linux-6.18-rc6/scripts/Makefile.build:556: kmap_local_page] Error 2
If you'd like to test, #17954 should get things going again. Thanks for the report!