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GCC 11 has introduced a new warning option, -Wtsan [1], to warn about
unsupported operations in the TSan runtime. But KCSAN != TSan runtime,
so none of the warnings apply.
[1] https://gcc.gnu.org/onlinedocs/gcc-11.1.0/gcc/Warning-Options.html
Ignore the warnings.
Currently the warning only fires in the test for __atomic_thread_fence():
kernel/kcsan/kcsan_test.c: In function ‘test_atomic_builtins’:
kernel/kcsan/kcsan_test.c🔢17: warning: ‘atomic_thread_fence’ is not supported with ‘-fsanitize=thread’ [-Wtsan]
1234 | __atomic_thread_fence(__ATOMIC_SEQ_CST);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
which exists to ensure the KCSAN runtime keeps supporting the builtin
instrumentation.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>