# git rev-parse -q --verify dda32e37d397f5937cc24a6e98b71d3645f51afa^{commit}
dda32e37d397f5937cc24a6e98b71d3645f51afa
already have revision, skipping fetch
# git checkout -q -f -B kisskb dda32e37d397f5937cc24a6e98b71d3645f51afa
# git clean -qxdf
# < git log -1
# commit dda32e37d397f5937cc24a6e98b71d3645f51afa
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Mon Apr 22 23:34:53 2024 +1000
# 
#     selftests/powerpc: Install tests in sub-directories
#     
#     The sources for the powerpc selftests are arranged into sub-directories.
#     However when the tests are built and installed, the sub-directories are
#     squashed, losing the structure.
#     
#     For example, with the current code the result of installing the selftests is:
#     
#       $ tree tools/testing/selftests/kselftest_install
#       tools/testing/selftests/kselftest_install
#       ├── kselftest
#       │   ├── ktap_helpers.sh
#       │   ├── module.sh
#       │   ├── prefix.pl
#       │   └── runner.sh
#       ├── kselftest-list.txt
#       ├── powerpc
#       │   ├── alignment_handler
#       │   ├── attr_test
#       │   ├── back_to_back_ebbs_test
#       │   ├── bad_accesses
#       │   ├── bhrb_filter_map_test
#       │   ├── bhrb_no_crash_wo_pmu_test
#       │   ├── blacklisted_events_test
#       │   ├── cache_shape
#       │   ├── close_clears_pmcc_test
#       │   ├── context_switch
#       │   ├── copy_first_unaligned
#       ...
#       │   ├── settings
#       ...
#       │   └── wild_bctr
#       └── run_kselftest.sh
#     
#     All the powerpc tests are squashed into the single powerpc directory. In
#     particular, note that there is a single `settings` file, even though
#     there are multiple settings files in the powerpc selftest sources. One
#     of the settings files ends up installed, depending on install order,
#     even if they have different contents.
#     
#     Similarly if there were two tests with the same name in different
#     sub-directories they would clobber each other.
#     
#     Fix it by replicating the directory structure of the source tree into
#     the install directory. The result being for example:
#     
#       $ tree tools/testing/selftests/kselftest_install
#       tools/testing/selftests/kselftest_install
#       ├── kselftest
#       │   ├── ktap_helpers.sh
#       │   ├── module.sh
#       │   ├── prefix.pl
#       │   └── runner.sh
#       ├── kselftest-list.txt
#       ├── powerpc
#       │   ├── alignment
#       │   │   ├── alignment_handler
#       │   │   └── copy_first_unaligned
#       │   ├── benchmarks
#       │   │   ├── context_switch
#       │   │   ├── exec_target
#       │   │   ├── fork
#       │   │   ├── futex_bench
#       │   │   ├── gettimeofday
#       │   │   ├── mmap_bench
#       │   │   ├── null_syscall
#       │   │   └── settings
#       ...
#       │   ├── eeh
#       │   │   ├── eeh-basic.sh
#       │   │   ├── eeh-functions.sh
#       │   │   └── settings
#       ...
#       │   └── vphn
#       │       └── test-vphn
#       └── run_kselftest.sh
#     
#     Note multiple settings files in different sub-directories.
#     
#     This change also has the effect of changing the names of the tests from
#     the point of view of the kselftest runner. Before the tests are named
#     eg:
#     
#       powerpc:copy_first_unaligned
#       powerpc:cache_shape
#       powerpc:reg_access_test
#     
#     After, the test collection names include the sub-directory:
#     
#       powerpc/alignment:copy_first_unaligned
#       powerpc/cache_shape:cache_shape
#       powerpc/pmu/ebb:reg_access_test
#     
#     That means whereas previously all powerpc tests could be run with:
#     
#       $ ./run_kselftest.sh -c powerpc
#     
#     After the change it's necessary to pass a regex that matches all powerpc
#     entries, eg:
#     
#       $ ./run_kselftest.sh -c "powerpc.*"
#     
#     The latter form also works before and after the change.
#     
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20240422133453.1793988-2-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 dda32e37d397f5937cc24a6e98b71d3645f51afa
# make -s -j 160 ARCH=arm64 O=/kisskb/build/powerpc-next_defconfig_arm64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  defconfig
# < make -s -j 160 ARCH=arm64 O=/kisskb/build/powerpc-next_defconfig_arm64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  help
# make -s -j 160 ARCH=arm64 O=/kisskb/build/powerpc-next_defconfig_arm64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  olddefconfig
# make -s -j 160 ARCH=arm64 O=/kisskb/build/powerpc-next_defconfig_arm64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/aarch64-linux/bin/aarch64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_defconfig_arm64-gcc13
# Build took: 0:03:59.936050