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| author | Marco Elver <elver@google.com> | 2021-11-30 14:44:20 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-10 03:42:27 +0300 |
| commit | 116af35e38cf97ed72111ac6bea19f8acea2d0ba (patch) | |
| tree | 304e199bb68665c609b621d627e45123a43cabe2 | |
| parent | 8bc32b34817862c80a8b9a82ceb643294acd3da3 (diff) | |
| download | linux-116af35e38cf97ed72111ac6bea19f8acea2d0ba.tar.xz | |
kcsan: Ignore GCC 11+ warnings about TSan runtime support
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:1234:17: 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>
| -rw-r--r-- | scripts/Makefile.kcsan | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/scripts/Makefile.kcsan b/scripts/Makefile.kcsan index 4c7f0d282e42..19f693b68a96 100644 --- a/scripts/Makefile.kcsan +++ b/scripts/Makefile.kcsan @@ -13,6 +13,12 @@ kcsan-cflags := -fsanitize=thread -fno-optimize-sibling-calls \ $(call cc-option,$(call cc-param,tsan-compound-read-before-write=1),$(call cc-option,$(call cc-param,tsan-instrument-read-before-write=1))) \ $(call cc-param,tsan-distinguish-volatile=1) +ifdef CONFIG_CC_IS_GCC +# GCC started warning about operations unsupported by the TSan runtime. But +# KCSAN != TSan, so just ignore these warnings. +kcsan-cflags += -Wno-tsan +endif + ifndef CONFIG_KCSAN_WEAK_MEMORY kcsan-cflags += $(call cc-option,$(call cc-param,tsan-instrument-func-entry-exit=0)) endif |