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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>
27 lines
1004 B
Makefile
27 lines
1004 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# GCC and Clang accept backend options differently. Do not wrap in cc-option,
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# because Clang accepts "--param" even if it is unused.
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ifdef CONFIG_CC_IS_CLANG
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cc-param = -mllvm -$(1)
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else
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cc-param = --param $(1)
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endif
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# Keep most options here optional, to allow enabling more compilers if absence
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# of some options does not break KCSAN nor causes false positive reports.
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kcsan-cflags := -fsanitize=thread -fno-optimize-sibling-calls \
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$(call cc-option,$(call cc-param,tsan-compound-read-before-write=1),$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1))) \
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$(call cc-param,tsan-distinguish-volatile=1)
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ifdef CONFIG_CC_IS_GCC
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# GCC started warning about operations unsupported by the TSan runtime. But
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# KCSAN != TSan, so just ignore these warnings.
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kcsan-cflags += -Wno-tsan
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endif
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ifndef CONFIG_KCSAN_WEAK_MEMORY
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kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0))
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endif
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export CFLAGS_KCSAN := $(kcsan-cflags)
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