[Bug 2151303] Comment bridged from LTC Bugzilla

------- Comment From Raman.Singh5@ibm.com 2026-05-05 05:30 EDT------- Problem Description:- Powepc tests in kselftest failed with following error log: In file included from test-vphn.c:3: In function ?vphn_unpack_associativity?, inlined from ?test_one? at test-vphn.c:371:2, inlined from ?test_vphn? at test-vphn.c:399:9: test-vphn.c:10:33: error: ?be_packed? may be used uninitialized [-Werror=maybe-uninitialized] 10 | #define be16_to_cpup(x) bswap_16(*x) | ^~~~~~~~ vphn.c:42:27: note: in expansion of macro ?be16_to_cpup? 42 | u16 new = be16_to_cpup(field++); | ^~~~~~~~~~~~ In file included from test-vphn.c:19: vphn.c: In function ?test_vphn?: vphn.c:27:16: note: ?be_packed? declared here 27 | __be64 be_packed[VPHN_REGISTER_COUNT]; | ^~~~~~~~~ cc1: all warnings being treated as errors make[2]: *** [../../lib.mk:222: /root/linux/tools/testing/selftests/powerpc/vphn/test-vphn] Error 1 make[2]: Target 'all' not remade because of errors. make[1]: *** [Makefile:40: vphn] Error 2 make[1]: Leaving directory '/root/linux/tools/testing/selftests/powerpc' make: *** [Makefile:203: all] Error 2 make: Leaving directory '/root/linux/tools/testing/selftests' Command used : make -C tools/testing/selftests TARGETS="powerpc" run_tests Comment 2 SEETEENA THOUFEEK 2026-03-27 06:44:05 CDT I had posted a v2 [1] base on the updates on the GCC bug and upstream review. The patch has also been tested by Venkat. [1] https://lore.kernel.org/all/20260313165426.43259-1-amachhiw@linux.ibm.com/ Comment 3 Raman Singh 2026-04-20 00:14:10 CDT The patch is in ppc-next now and should be included in the next PR https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=6e65886fceb23605eff952d6b1975737b4c4b154 The patch is in upstream Linux now: 6e65886fceb2 ("selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15") ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2151303 Title: [Ubuntu 26.04] kselftest failed on Guest Status in linux package in Ubuntu: New Bug description: Powepc tests in kselftest failed with following error log: In file included from test-vphn.c:3: In function ?vphn_unpack_associativity?, inlined from ?test_one? at test-vphn.c:371:2, inlined from ?test_vphn? at test-vphn.c:399:9: test-vphn.c:10:33: error: ?be_packed? may be used uninitialized [-Werror=maybe-uninitialized] 10 | #define be16_to_cpup(x) bswap_16(*x) | ^~~~~~~~ vphn.c:42:27: note: in expansion of macro ?be16_to_cpup? 42 | u16 new = be16_to_cpup(field++); | ^~~~~~~~~~~~ In file included from test-vphn.c:19: vphn.c: In function ?test_vphn?: vphn.c:27:16: note: ?be_packed? declared here 27 | __be64 be_packed[VPHN_REGISTER_COUNT]; | ^~~~~~~~~ cc1: all warnings being treated as errors make[2]: *** [../../lib.mk:222: /root/linux/tools/testing/selftests/powerpc/vphn/test-vphn] Error 1 make[2]: Target 'all' not remade because of errors. make[1]: *** [Makefile:40: vphn] Error 2 make[1]: Leaving directory '/root/linux/tools/testing/selftests/powerpc' make: *** [Makefile:203: all] Error 2 make: Leaving directory '/root/linux/tools/testing/selftests' Command used : make -C tools/testing/selftests TARGETS="powerpc" run_tests With the following patch issue is fixed:- The patch is in upstream Linux now: 6e65886fceb2 ("selftests/powerpc: Suppress -Wmaybe-uninitialized with GCC 15") ~Amit To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2151303/+subscriptions