[Impact]
When trying to build powerpc tests from ubuntu_kernel_selftests, it
will fail with:
inlined from ‘cycles_with_mmcr2’ at cycles_with_mmcr2_test.c:81:3:
/usr/include/powerpc64le-linux-gnu/bits/stdio2.h:86:10: error: ‘actual’ may be used uninitialized [-Werror=maybe-uninitialized]
86 | return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cycles_with_mmcr2_test.c: In function ‘cycles_with_mmcr2’:
cycles_with_mmcr2_test.c:25:36: note: ‘actual’ was declared here
25 | uint64_t val, expected[2], actual;
| ^~~~~~
cc1: all warnings being treated as errors
[Fix]
* ff446cd768 "selftests/powerpc: Avoid GCC 12 uninitialised variable warning"
This patch can be cherry-picked into Kinetic kernel.
[Test]
Apply this patch to the kernel tree and build it with:
sudo make -C linux/tools/testing/selftests TARGETS=powerpc
With this error fixed, test compliation can finish without any issue.
[Where problems could occur]
Change for test case, no impact to acutal function.
[Original Bug Report]
Issue found with K-5.19.0-28-generic on P9 node baltar
This should not be considered as a regression since ubuntu_kernel_selftests will be blocked by the net test crash before this powerpc tests can be started. This was found by manually running the test.
Test build failed with:
gcc -std=gnu99 -O2 -Wall -Werror -DGIT_VERSION='"unknown"' -I/home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/include -m64 -no-pie cycles_with_mmcr2_test.c ../../harness.c ../../utils.c ../event.c ../lib.c ebb.c ebb_handler.S trace.c busy_loop.S -o /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test
In file included from /usr/include/stdio.h:906,
from cycles_with_mmcr2_test.c:6:
In function ‘printf’,
inlined from ‘cycles_with_mmcr2’ at cycles_with_mmcr2_test.c:81:3:
/usr/include/powerpc64le-linux-gnu/bits/stdio2.h:86:10: error: ‘actual’ may be used uninitialized [-Werror=maybe-uninitialized]
86 | return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cycles_with_mmcr2_test.c: In function ‘cycles_with_mmcr2’:
cycles_with_mmcr2_test.c:25:36: note: ‘actual’ was declared here
25 | uint64_t val, expected[2], actual;
| ^~~~~~
cc1: all warnings being treated as errors
make[3]: *** [../../../lib.mk:173: /home/ubuntu/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test] Error 1
Please find attachment for the complete build log.
Fix from upstream
https:/