kcsan: Re-add GCC as a supported compiler
GCC version 11 recently implemented all requirements to correctly support KCSAN: 1. Correct no_sanitize-attribute inlining behaviour: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4089df8ef4a63126b0774c39b6638845244c20d2 2. --param=tsan-distinguish-volatile https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=ab2789ec507a94f1a75a6534bca51c7b39037ce0 3. --param=tsan-instrument-func-entry-exit https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=06712fc68dc9843d9af7c7ac10047f49d305ad76 Therefore, we can re-enable GCC for KCSAN, and document the new compiler requirements. Signed-off-by: Marco Elver <elver@google.com> Cc: Martin Liska <mliska@suse.cz> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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@ -8,7 +8,8 @@ approach to detect races. KCSAN's primary purpose is to detect `data races`_.
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Usage
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-----
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KCSAN requires Clang version 11 or later.
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KCSAN is supported by both GCC and Clang. With GCC we require version 11 or
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later, and with Clang also require version 11 or later.
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To enable KCSAN configure the kernel with::
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@ -4,7 +4,8 @@ config HAVE_ARCH_KCSAN
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bool
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config HAVE_KCSAN_COMPILER
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def_bool CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)
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def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)) || \
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(CC_IS_GCC && $(cc-option,-fsanitize=thread --param tsan-distinguish-volatile=1))
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help
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For the list of compilers that support KCSAN, please see
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<file:Documentation/dev-tools/kcsan.rst>.
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@ -6,7 +6,7 @@ ifdef CONFIG_KCSAN
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ifdef CONFIG_CC_IS_CLANG
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cc-param = -mllvm -$(1)
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else
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cc-param = --param -$(1)
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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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