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author | Brendan Jackman <jackmanb@google.com> | 2021-01-14 21:17:50 +0300 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2021-01-15 05:34:29 +0300 |
commit | 98d666d05a1d9706bb3fe972157fa6155dbb180f (patch) | |
tree | 7d756eb0f033b90497e951419d8c682c603a472f /Documentation/networking | |
parent | 981f94c3e92146705baf97fb417a5ed1ab1a79a5 (diff) | |
download | linux-98d666d05a1d9706bb3fe972157fa6155dbb180f.tar.xz |
bpf: Add tests for new BPF atomic operations
The prog_test that's added depends on Clang/LLVM features added by
Yonghong in commit 286daafd6512 (was https://reviews.llvm.org/D72184).
Note the use of a define called ENABLE_ATOMICS_TESTS: this is used
to:
- Avoid breaking the build for people on old versions of Clang
- Avoid needing separate lists of test objects for no_alu32, where
atomics are not supported even if Clang has the feature.
The atomics_test.o BPF object is built unconditionally both for
test_progs and test_progs-no_alu32. For test_progs, if Clang supports
atomics, ENABLE_ATOMICS_TESTS is defined, so it includes the proper
test code. Otherwise, progs and global vars are defined anyway, as
stubs; this means that the skeleton user code still builds.
The atomics_test.o userspace object is built once and used for both
test_progs and test_progs-no_alu32. A variable called skip_tests is
defined in the BPF object's data section, which tells the userspace
object whether to skip the atomics test.
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210114181751.768687-11-jackmanb@google.com
Diffstat (limited to 'Documentation/networking')
0 files changed, 0 insertions, 0 deletions